Manual Arc Welding Explained: Electrodes, Setup & Safety

It’s raining, the gate is already half-welded, and the shop MIG machine is a mile down the road. That’s when a welder grabs a 3/32-inch E6011, drops a ground clamp on the wet steel, and gets a crackling arc going with nothing but a transformer and a stick. Manual arc welding is the process that saves the day when everything else is inconvenient — and it’s also the one most beginners learn wrong. This guide walks through how the process actually works, how to read an electrode code, how to set your machine, and how to weld without quietly ruining your joints.

What Manual Arc Welding Is (and Why It Still Matters)

The rain came down sideways, a gate hinge snapped through, and the shop MIG machine sat down the road with a dead battery. The welder grabbed a 3/32-inch E6011 rod, clamped it to wet steel and struck a crackling arc with nothing but a transformer and a stick. That is manual arc welding in one sentence.

So what is it exactly? Manual arc welding is shielded metal arc welding (SMAW): a flux-coated consumable electrode sits in a holder, is struck against the workpiece to create an electric arc, and melts to build the joint. The trade name is stick welding, because the electrode is literally a “stick.” Outside North America it is manual metal arc welding (MMA), the ISO name; AWS calls it SMAW. All four labels mean the same process, the oldest arc welding process still in daily use.

The Four Things Every Stick Weld Relys On

Four parts make up a manual arc weld:

• A consumable core wire. Mild steel, stainless or nickel depending on the rod. It melts and becomes the deposited weld metal, not a filler rod you feed by hand.
• A flux coating. The powdery outer layer, unpacked later in this guide.
• An electric arc. A sustained plasma between electrode tip and workpiece. The heat comes from the arc, not a torch or laser.
• A slag layer. Solid waste floating on the cooling weld, chipped off before the next pass.

That slag step is what beginners hate most. The Australian Welding Institute describes SMAW as one where the arc is shielded by gas from the electrode coating, and the weld is cleaned of slag between passes.

A Short History: From a Bare Rod in 1888 to a Global Standard

Manual metal arc welding was invented in Russia in 1888 by a university professor using a bare metal rod with no flux coating. Two early 1900s developments in Europe made it usable:

• The Kjellberg process in Sweden, coating the rod with a flux layer.
• The Quasi-arc method in the UK, a different coating chemistry with a thin layer of iron compounds.

TWI’s technical overview of the manual metal arc process confirms the flux coating is what made the process commercially practical.

Coated electrodes cost more than bare wire, and fabricators were reluctant to switch. Demand for sound welds changed that: tougher joints for bridges, pressure vessels and shipbuilding made the coated electrode inevitable. Carbon steel SMAW classifications sit in AWS A5.1/A5.1M:2025.

Why It Refuses to Die

Modern shops have TIG, MIG, plasma and laser, yet stick still wins its share:

• No gas cylinder to haul. No rental fees, no deliveries, no empty cylinders on a cold morning.
• Cheap equipment. A basic transformer stick machine still makes a good weld; consumables cost pennies per foot.
• It welds dirty, rusted, painted steel. The flux shields the arc itself, so rust, mill scale and paint do not matter. MIG and TIG spit and porosity.
• All-position capability with one electrode. A single all-position rod welds flat, horizontal, vertical and overhead.
• It handles nearly every metal. Iron, carbon and low-alloy steel, stainless, aluminium, nickel and copper alloys. Aluminium is very weldable by stick with the right electrode, as covered in aluminum flux welding and aluminum flux core welding.

A stick machine also runs off a decent generator, as the advantages of stick welding explains in more depth.

Who Actually Uses Manual Arc Welding

• The hobbyist or weekend warrior. Gate repairs, brackets, trailer frames, a Saturday tack job, on joints nobody cleaned first.
• The farm and repair-shop welder. Machinery, implements, trailers, fencing, often in mud and rain with no shop nearby.
• The structural field welder. Code governs electrode choice, which is why low-hydrogen E7018 rods dominate and why AWS D1.1 qualifications matter.
• The pipefitter. Root, fill and cap passes on pressure piping in tight quarters, where a rod beats a TIG torch and no gas supply needs to run alongside the pipe.

The Honest Truth About Skill and Efficiency

Manual arc welding is skill-intensive: electrode position, arc length, travel speed and puddle control are under the welder’s direct control, and a beginner’s bead shows it.

It is also the least efficient of the common arc processes. The SMAW operating factor, the share of arc-on time spent laying weld rather than swapping electrodes, chipping slag and cleaning up, is roughly 25 percent. MIG runs far higher, which is why production shops moved on decades ago.

That gap is offset by low setup cost, no consumable gas and minimal equipment, and the skill is learnable: the same four variables explain nearly every result, good or bad, once you can read your own bead.

Next, the black box: how the arc behaves, why the machine must be constant current, what DCEN and DCEP do to the heat, and why arc length shapes your bead.

How the Stick Arc Actually Works: Polarity, Current and Shielding

Most beginners treat a welder like a light switch: on, strike, weld. Every bead comes from a running negotiation between current, voltage, arc length and travel speed. The arc itself is not a flame but a sustained column of ionised gas carrying current between the electrode tip and the work, wrapped in a shielding envelope that keeps air out. Being a gas discharge, it has its own voltage and temperature.

Why constant current, not constant voltage

Power sources come in two flavours. Constant current (CC) holds amperage steady and lets arc voltage rise and fall as arc length changes. Constant voltage (CV) holds voltage steady and lets amperage respond, which suits continuously fed wire processes such as GMAW and FCAW, where the feeder pushes wire at a set rate and the machine manages arc length for you.

Stick welding has no wire feeder and no length sensing. The electrode melts back and you correct the gap by hand dozens of times a minute. Those length variations are unavoidable with covered electrodes, which is why constant current power sources are the specified choice for manual arc welding. A CC machine quietly fights your hand: when the arc lengthens, voltage climbs but current stays where you set it, so the arc self-corrects.

Polarity: DCEN, DCEP and AC

Polarity decides which side of the arc gets the heat. About two thirds always lands on the workpiece; polarity just shifts the remaining third.

Polarity	Extra heat goes to	Electrode	Weld
DCEN (electrode negative)	Electrode	Faster melt, shorter stick-out	Shallower penetration, wider bead
DCEP (electrode positive)	Workpiece	Slower melt rate	Deeper penetration, narrow and tall bead
AC	Alternates between both	Balanced melt rate	Balanced penetration, no arc blow

DCEN puts heat on the electrode, so the rod melts faster and penetration drops. DCEP drives heat into the work, which is why most structural stick welding runs reverse polarity for penetration. AC alternates polarity more than 100 times per second, splitting the difference between melt rate and penetration and making AC-only electrodes such as E6020 usable. That reversal is also why arc blow is largely an AC-avoided problem. Rod and position trade-offs are broken down in the all position welding rod guide.

Arc voltage, arc length and bead shape

Arc voltages for arc welding run about 8 to 40 volts, with currents in practice in the 50 to 500 ampere band. Voltage tracks arc length almost one to one: a short arc runs roughly 15 to 18 volts, a long stretched arc climbs past 30.

A short, tight arc concentrates heat into a narrow footprint, giving deep penetration, a proud crown and a bead about twice the electrode width. A long arc spreads that energy over a wider, longer puddle, giving a flat, wide bead with weak fusion at the toes, more oxidation and spatter. Keep the arc about one electrode diameter long. The TWI manual metal arc process notes and the Australian Welding Institute’s SMAW overview both put arc control first.

What the flux coating is actually doing

The coating is not decoration. When the arc strikes it decomposes in stages: it burns to release a shielding gas that displaces air around the arc, and it melts to form the slag layer that floats on the puddle and protects the cooling weld metal. It carries deoxidisers and alloying elements such as manganese, silicon and titanium into the deposit, plus calcium fluoride in low-hydrogen coatings. It also stabilises the arc, so some electrodes run noticeably quieter. Every pass must be chipped clean before the next goes on top.

Arc blow and how to kill it

Arc blow happens when the magnetic field around the current path grabs the arc and drags it sideways, usually toward the work clamp side of the joint. You see a wandering arc that spits, a bead that changes shape mid-pass, or a flare that throws molten metal. It is essentially a DC problem, so there are two cures: move the work clamp close to the arc and weld toward it, or switch to AC. Welding toward the clamp gives the field a path that pulls the arc back into the joint.

Heat input is a simple equation

Net energy input to the joint is calculated as:

(Voltage x Current x heat transfer or arc efficiency factor) / welding travel speed

Everything else follows. Slow the travel speed and heat per unit length climbs, so the base metal melts deeper and the bead spreads. Push travel speed up and you get a shallow, narrow bead with poor fusion at the edges. That is why beginners who hurry the arc end up raising amperage to compensate, then burn through thin plate or distort the joint. Controlling that balance is the core of the case for stick welding, and it returns in setup, technique and troubleshooting.

How to Read an Electrode Code and Choose the Right Rod

Pull a box of sticks off the shelf and you will find them stamped E7018 or E6013. That stamp is not branding, it is a specification: how strong the weld metal has to be, which positions you may weld it in, and what the coating is made of. The system in use today is the AWS classification for covered electrodes. Read it and you choose rods deliberately; guess and you burn rods, make poor beads, and put an under-strength deposit into a load-bearing joint.

Breaking the code down digit by digit

1. The E simply means electrode.
2. The 70 is the minimum tensile strength of the weld metal in thousands of pounds per square inch: E7018 welds to at least 70,000 psi, E6013 to at least 60,000 psi.
3. The 1 is the position code. 1 means all positions (flat, horizontal, vertical, overhead), 2 means flat and horizontal only, 4 means all positions with vertical travel restricted to downwards.
4. The 8 is the coating and current type, and it always pairs with the position digit. 10 is high cellulose, DC reverse only; 11 is high cellulose, AC or DC reverse; 12 and 13 are high titania (rutile), either polarity; 14 is rutile iron powder; 16 and 18 are iron powder low hydrogen; 24 is rutile iron powder with a high deposition rate.

The pairing is not academic. A rod rated flat and horizontal only will not give a dependable overhead bead, and a cellulose rod designated DC reverse will not run on a machine set to AC.

The four coating families

Almost everything that shapes how a rod behaves in manual arc welding comes from the coating, which decomposes in the arc to release shielding gas, lay down slag and add deoxidisers and alloying elements. The TWI guide to the manual metal arc process covers that chemistry in more depth. Four families cover nearly everything you buy.

Cellulosic (E6010, E6011). A thick, chewy coating that burns fast and makes a fluid slag that wipes away easily. Deep penetration, and they tolerate dirty, rusty or painted steel better than anything else on the shelf, which is why they remain the classic farm and field repair rod. The trade-off is high diffusible hydrogen, so the weld metal is less ductile. E6010 is DC reverse only; E6011 also runs on AC, the safer pick when machine polarity is unknown.

Rutile (E6012, E6013, E7014). Rutile coatings hold 25% to 45% TiO2. The arc is easy, quiet and stable, the slag peels off cleanly, and the bead looks tidy. Penetration is lower than cellulosic, a fair trade on thinner material. E6013 is the classic training electrode: forgiving, versatile, and the rod most first-time welders learn on. E7014 adds iron powder for a faster burn rate. Both run on either polarity.

Basic or low hydrogen (E7018). The structural and pressure workhorse. The coating limits diffusible hydrogen and the weld metal comes out strong and ductile. Flat and horizontal fillet welds land slightly convex with a smooth, finely rippled surface, spatter is very low, and the arc is smooth and quiet. The E-7018 series can meet the most severe X-ray quality standards, which is why it shows up on code work and critical joints. One rule is non-negotiable: the calcium fluoride coating is hygroscopic, so it pulls moisture from the air and the rod must live in a heated holding oven.

Iron powder (E7024). Roughly half iron powder by weight, so you can run higher amperage on the same diameter and lift the deposition rate until filler metal is delivered up to twice as fast, with a slag that very nearly peels itself off. A production electrode for flat and horizontal fillets, and equally the wrong choice for overhead or vertical-up work, where that heavy slag will not stay where you put it.

The six workhorse electrodes at a glance

Electrode	Coating	Current	Positions	Penetration	Typical use
E6010	High cellulose	DC reverse	All	Deep	Dirty or rusted steel, pipe, field repair
E6011	High cellulose	AC or DC reverse	All	Deep	Farm and field work, unknown machine polarity
E6013	High titania (rutile)	Either polarity	All	Medium	Training and general fabrication
E7014	Rutile iron powder	Either polarity	All	Medium	General fabrication with a faster fill
E7018	Iron powder low hydrogen	AC or DC reverse	All	Medium to deep	Code structural, pressure work, critical joints
E7024	Rutile iron powder, high deposition	Either polarity	Flat, horizontal, fillet	Medium	High production flat and horizontal fillets

Beyond the carbon steel shelf

Most of your work will be carbon steel, but the same numbering logic carries over.

• Stainless: AWS A5.4 governs stainless steel electrodes. E308L matches 304 and 308 stainless, E309L is the transition rod for joining carbon steel to stainless, and E316L matches 316 stainless with its molybdenum corrosion resistance.
• Low alloy and high strength steel: AWS A5.5 covers low-alloy electrodes for quenched and tempered steels and pressure applications. The alloy steel welding electrode guide breaks down selection for these grades.
• Nickel alloys: AWS A5.11 covers nickel electrodes, including nickel-iron and nickel-chromium types used for cast iron repair and joining dissimilar metals.

Amperage, Electrode Diameter and Machine Setup

Nothing ruins a stick weld faster than a badly set up machine. TWI puts it bluntly: even experienced welders will not produce a quality weld if the machine set-up is wrong. Dialing amperage takes two minutes, and it governs bead width, penetration, spatter and much of the troubleshooting that follows.

The rule of thumb most shops use is roughly one amp per 0.001 inch of electrode core wire diameter. That puts a 1/8 inch rod near 125 amps, 3/32 inch near 90 amps and 1/4 inch near 250 amps. Treat it as a starting point, not a procedure. Every coating chemistry has its own operating window, and the manufacturer data sheet always beats a generic chart.

Typical operating ranges for common electrodes

Ranges printed on most packaging and supplier charts, in amps.

Electrode	3/32 in	1/8 in	5/32 in	3/16 in	7/32 in	1/4 in	Current	Positions
E6010	20–80	60–130	90–150	120–200	150–250	180–320	DC+ (DCEP)	All
E6011	20–80	60–130	90–150	120–200	150–250	180–320	AC or DC+	All
E6013	20–80	60–130	90–150	120–200	150–250	180–320	AC or DC±	All
E7014	70–120	90–160	120–200	150–240	180–280	210–300	AC or DC+	All
E7018	20–80	90–160	120–200	150–250	180–280	210–320	AC or DC+	All
E7024	120–180	150–240	180–280	210–320	240–350	250–380	DC+	Flat and horizontal fillet

E7024, the high deposition iron powder rod, is the outlier. It runs hot, deposits fast, and its heavy slag is unsuited to out-of-position work. The all-position welding rod guide walks through the six workhorse rods.

Shifting the setting for welding position

The same rod welded flat, horizontally, vertically upward or overhead needs different amperage. Vertical-up and overhead typically run 10–15% below flat-position amperage, because the puddle is fighting gravity and a hot, runny pool is the last thing you want.

Position	Amperage	What else changes
Flat	Upper half of the published range	Widest bead, best penetration, easiest slag control
Horizontal fillet	Mid-range	Drag the rod 5–10° upward to hold the puddle on the root
Vertical-up	10–15% below flat	Short beads, let each cool slightly before restarting
Overhead	10–15% below flat	Tightest arc, smallest bead, expect molten metal to fall

Hobart’s E7018 data sheet lists 1/8 inch at 90–150 amps and 3/16 inch at 150–300 amps, and recommends dropping amperage by about 15% for out-of-position welding, which lines up with the table above.

Plate thickness changes the target

Rod diameter tells you what the electrode can handle, but joint thickness tells you where to sit inside that range. A 1/8 inch E7018 is rated for 90–160 amps, yet welding 1/4 inch plate lands much closer to 110–125 amps. Thick plate runs cooler per unit area at the same amperage, and the extra current you were tempted to add would just burn the rod faster and widen the bead. On thin material, work at the bottom of the range.

Arc length follows the rod too. Miller’s stick guidelines suggest an arc length of about 1/16 inch (1.6 mm) for 1/16 and 3/32 inch electrodes, and about 1/8 inch (3 mm) for 1/8 and 5/32 inch electrodes.

The setup routine

1. Read the rod packaging first. The maker’s range for that electrode and diameter overrides everything here.
2. Set the machine to constant current. On a multi-process panel, choose Stick or SMAW mode so the machine does not try to run as a constant voltage source.
3. Set polarity. DC+ (DCEP) for E6010, AC or DC+ for E6011 and E7018, and either polarity for E6013 and E7014. Panels label the switch Stick, DCEN, DCEP or AC.
4. Set the amperage from the range table, adjusted for position and plate thickness.
5. Install the work clamp as close to the weld as possible. A long work lead adds resistance, drops the voltage reaching the arc and weakens penetration.
6. Confirm constant current is active before you strike. See the OSHA general welding requirements for how equipment should be handled.

Why does constant current matter? Arc length inevitably changes as the rod melts away, and a constant current source raises voltage to hold the arc when you lengthen it, then drops it when you tighten up. That is arc-length compensation, and it is why manual arc welding will not run on a constant voltage supply the way MIG does.

Leads, duty cycle and panel settings

Long electrode and work leads waste voltage you need at the arc, so keep them as short as practical and keep connections clean. Undersized leads heat up, cause voltage drop and erratic arc behaviour.

Read the duty cycle on the machine plate. A unit rated 60% duty cycle at 200 amps can run at 200 amps for six minutes out of every ten, then needs a cooldown. Push it flat out and you will overheat the transformer. On multi-process machines the panel may show Stick, DCEN, DCEP or AC rather than a plain amperage dial, which means the machine handles constant current behaviour once you pick the process.

This is also why stick remains the easiest process to take to a job site, as the advantages of stick welding outline. When a bead does not look right, check the data sheet and recheck the machine before you change the rod or the joint. Setup is where most bad welds begin and the cheapest place to fix them, and the openwa setup guidance follows the same logic.

Practical Technique: Striking the Arc, Bead Control and Welding Positions

Setting the right amperage is only half the job. The other half is what your hands do once the arc is lit. Two welders can set identical machines to 120 amps with the same rod and produce one good weld and one terrible one. The difference is technique: how the arc is struck, how long it is held, how the electrode is angled, how the puddle is managed, and how the weld is ended. Unlike skills that take years to polish, arc control responds to practice quickly. A dozen hours of focused coupon work beats a dozen hours of reading.

Striking the Arc: Two Ways to Light It

Welding training literature documents two reliable ways to start a manual arc, and every shop ends up preferring one.

The scratch start is more common. Hold the electrode at a shallow angle, roughly 20 to 30 degrees from the work, and drag the tip lightly across the base metal like striking a match. The moment the tip kisses the steel, the arc ignites and you lift the electrode into the proper arc length. Keep it a light touch. Drag hard and you gouge a scratch or crater that ends up in the finished bead.

The tap start is the alternative. Hold the electrode just above the work, tap down gently like a pool cue, then raise it slightly to establish the arc. It is cleaner on thin material and finished surfaces where a scratch mark matters, but it takes more practice to land the tap without poking the rod into the puddle or missing the work entirely.

Either way, avoid touching a live, unshielded electrode to grounded metal. The flux coating is the only thing protecting the molten tip from the atmosphere, so breaking that coating and touching bare rod to bare steel creates a dead short. The current has nowhere to go but back through the holder, the rod melts into a blob, and the electrode sticks solid to your work.

Sticking happens to every welder eventually. It is not incompetence, and the fix is not to press harder. Lift the electrode a few millimetres, twist it free, and re-strike. If the rod is welded on, let it cool and knock it loose rather than yanking it, which usually leaves you with a broken rod and a divot in the plate.

Arc Length: The Discipline That Separates Good Welds

A common working rule is to hold an arc roughly one electrode diameter long. A 3/32 inch rod wants an arc about 3/32 inch long; a 1/8 inch rod wants a bit more. This is a starting discipline, not a measurement, because you cannot gauge arc length precisely by eye, but it gives your hands a target.

Too long an arc produces a wide, flat, cold bead. The flux burns off before it can do its job, the weld metal oxidises, and you pick up more spatter. Too short an arc risks stubbing the electrode, pushing unmelted flux into the puddle, and getting poor fusion with the base metal.

Watch the sound and the colour. A good stick arc has a steady crackle and a bright, clean bead. A lazy, hissing arc with a dull, grey, oxidised bead means you are long. A gurgling, spitting arc that will not hold means you are short or the polarity is wrong.

Work Angle, Travel Angle and the Drag Principle

The Australian Welding Institute reference angles give you a reliable starting point for each position:

Position	Work Angle (electrode to work)	Travel Angle
1G / 1F (flat, groove and fillet)	10 to 30 degrees	Straight, 10 to 30 degrees
2G / 2F (horizontal)	45 degrees	10 to 30 degrees drag toward travel
3G / 3F (vertical)	45 degrees	45 degrees, tight weave
4G (overhead)	10 to 30 degrees	Straight

Now the single most important habit in manual arc welding: you drag the electrode, you do not push it. In GMAW and GTAW the torch is pushed forward, and those habits transfer badly. In SMAW the electrode is drawn back along the joint as you travel, which directs the arc force and heat into the leading edge of the puddle and gives a bead with better penetration and reinforcement. Pushing the rod flattens the bead and throws the puddle ahead of you.

The references for all-position welding rod selection are worth reviewing before you start, because the position often dictates the rod you pick as much as the joint does.

Bead Width, Stringers and Weaves

A common rule is that the finished bead should be roughly twice the width of the electrode. A 1/8 inch rod should produce a bead around 1/4 inch wide. A narrow, tall bead means you are pushing too much material to the centre. A wide, flat bead means you are spreading too much heat.

A stringer is a straight bead with no sideways motion. It is the cleanest, fastest pattern and the right default for most fillet welds and for vertical-up work on thin material.

A weave moves the electrode side to side as you travel. It is useful when you need to spread heat, fill a wider gap, or build up a pass in vertical-up position. But the pattern should match the electrode. Back-and-forth motion suits the cellulosic E6010 and E6011, whose fluid slag and fast burn-off handle it cleanly. Low-hydrogen electrodes such as E7018 and E7024 are better run in a circular motion or held steady, because aggressive weaving can trap unmelted flux and leave slag inclusions. A broadly useful reference for electrode selection and handling is the advantages of stick welding overview.

Whichever pattern you use, pause briefly at the toes, the points where the weave reverses direction. Lingering there concentrates heat and lets the toes melt properly into the base metal. Rush the reversals and you get undercutting and lack of fusion at the edges of the bead.

Feeding the Electrode and Controlling the Puddle

Do not feed the electrode into the puddle. Hold it over the puddle and let it melt down, keeping the arc length steady as the rod shortens. Forcing the rod into the molten metal jams the tip, creates a short, and produces a blobby, poorly penetrated bead. Beginners do this constantly because it feels like the electrode is “getting in the way.” It is not. The electrode is being consumed, and the arc length grows as it does. Manage the arc, not the rod.

Watch the puddle size. A puddle that spreads ahead of the arc and pushes past the edges of your bead is too large. Reduce amperage or move faster. A puddle that is barely visible and sluggish needs more heat.

Ending a weld is where many cracks are born. When you stop travel, the puddle sits there, still hot, still shrinking, and it pulls open a crater that can crack as it cools. Fill the crater before you break the arc. The easiest method is the crater fill: as you finish the run, pause at the end of the bead and hold the arc in place with a little extra heat, allowing the crater to fill and level out. You can also step off the end and drag slowly, or reverse the electrode briefly back over the bead. Then kill the arc. Do not simply snap the electrode away at full pool, because a sudden break leaves a deep, open crater.

Slag is the other half of bead control. TWI is clear that slag must be chipped off the bead once a run is complete and before the next pass is deposited. Use a chipping hammer and a wire brush, and clean down to bright metal. Bead on bead over a skim of leftover slag traps it in the root and you will find it later with a grinder or an inspector.

Vertical-Up Welding

Vertical-up is where new welders lose confidence fastest because gravity fights the puddle. Two techniques cover most work.

The J-weave or triangle weave moves the electrode in a small pattern up the joint, pausing at the toes of each V. It spreads heat without overheating a single spot, which is what you want in vertical-up because heat pools at the bottom of the puddle and runs down into the toes. The stringer technique, a straight vertical bead with no side motion, is the right choice on thin material where there is no room to weave and where added heat means burn-through.

Cellulosic E6010 and E6011 electrodes are noted for their suitability for the vertical-down “stovepipe” technique, where the electrode points up the joint and the weld is deposited downward, which some fabricators prefer on pipe because the heat stays ahead of the puddle. It is worth learning, though vertical-up with a rutile rod is the more common path.

Overhead Welding

Overhead is a confidence problem more than a technical one. The molten metal is above you, gravity is your enemy, and your helmet is fogging or dripping into your eyes.

• Use a helmet that fits well and, ideally, an auto-darkening lens so you are not welding through a black filter while your hood drips.
• Reduce amperage by 10 to 15 percent from your flat setting. Less heat means a smaller puddle and less sag.
• Keep the arc tight. A long arc overhead widens the puddle and gives molten metal time to run.
• Anticipate the drip. Wear a leather or cotton bib, keep your arms and chest covered, and expect to hear it hit your helmet.
• Take small bites. Short beads with frequent cleaning are far easier overhead than one long pass.

Keep in mind that every technique in this section is a means to an end, and the end is a sound joint that meets the requirement of the drawing. Learn the fundamentals on scrap, apply them on the job, and then follow the air arc and gouging reference for the cleaning and preparation work that comes before any of it.

Safety and Health: Fume, Radiation, Fire and PPE

Manual arc welding is forgiving about metal condition. It is not forgiving about the welder. The arc throws off intense ultraviolet and infrared radiation, the flux coating boils into metal fume, and the slag you chip off hides molten steel that will burn through a tarpaulin twenty feet away. Serious injuries in the trade trace back to the same short list: wrong PPE, no ventilation, no fire watch, and welding on a vehicle with the battery still connected.

Your PPE stack, in order of importance

Start with the helmet. The arc eye (photokeratitis) is the most common injury in the trade, and it comes from looking at or near the arc. A curtain, a dark room or sunglasses will not protect you. You need a welding helmet with an auto-darkening filter that drops to the correct shade for your amperage.

• Helmet and lens shade: Shade 10 suits roughly 90 to 140 amps on stick, with 11 and 12 for higher amperage and thin material. Auto-darkening helmets switch in milliseconds, so you can weld all day without lifting the hood to grind and chip. If you are new to welding, one is worth the money.
• Gloves: Leather welding gloves, gauntlet style, so the cuff covers your sleeve. Heat is only half the story; spatter and stubbing a live electrode into your palm burns skin fast.
• Body: A leather apron or flame-resistant clothing over cotton. Avoid synthetics, which melt and stick to skin.
• Feet and ears: Safety boots with metatarsal protection, and hearing protection when grinding, chipping slag or working where several people weld at once.
• Respirator: No substitute for ventilation, but the right tool where ventilation cannot keep the fume concentration down.

Our guide to the advantages of stick welding covers the equipment side, and our welding PPE and helmet buying guide walks through helmet sizing and shade choices. We may earn a commission on some links in it.

Welding fume is the hazard people underestimate

Welding fume is a fine airborne mixture of metal oxides, often classified in general industry as a carcinogen. It is not the visible smoke: the particle fraction reaching deep into the lungs is largely invisible, which is why a shop that “looks” clear can still be hurting you.

Welding stainless steel or any chromium-bearing alloy converts chromium into hexavalent Cr(VI). Cr(VI) fume damages the eyes, skin, nose, throat and lungs, and causes cancer. OSHA’s hexavalent chromium standard sets a permissible exposure limit of 5 micrograms per cubic metre of air as an 8-hour time-weighted average, with an action level of 2.5 µg/m³. NIOSH recommends a far more protective recommended exposure limit of 0.2 µg/m³ for all Cr(VI) compounds, and OSHA’s Cr(VI) directive states that welders represent nearly half of the employees covered by the standard.

Other metals carry their own rules. OSHA’s welding standard calls for local exhaust ventilation or air-line respirators when welding zinc-bearing materials (including galvanised steel), lead, cadmium and chromium-bearing metals, and beryllium requires both. If you are welding galvanised steel, grind the coating off or apply fume control. Clean surfaces of solvent residue and paint before welding, and stay upwind of your plume outdoors.

Confined spaces: where the rules get strict

Welding inside a tank, drum, hopper or pipe is a different category of work. OSHA 1926.353 requires mechanical ventilation in confined spaces, and where access is restricted so an air-line respirator is needed, it calls for an outside attendant with a pre-planned rescue procedure. A self-contained respirator is no shortcut into a space you cannot be pulled out of quickly. As OSHA’s welding fact sheet puts it, the fume follows you into the space.

Fire safety and the 30-minute watch

Every hot job needs a hot work permit, a fire watch with an extinguisher within reach, and a plan for the materials around you. Move or cover flammables, seal off the underside of the work, and watch where slag and spatter travel. Slag hides in footwear, inside a jacket cuff or under a vehicle and stays hot long enough to start a fire hours later. Standard practice is a 30-minute post-work fire watch after the last arc is struck.

Welding on vehicles needs its own note. Miller’s stick welding guidelines warn that weld current can damage electronic parts, so both battery cables must be disconnected before you weld on a vehicle. Smarter systems also need the ECU and modules unplugged, but the batteries are the non-negotiable step.

Your pre-weld safety checklist

None of this is bureaucratic overhead. A welder who breathes fume once rarely notices it, and by the time symptoms appear the damage is done. Treat ventilation, PPE and the fire watch as part of the process, not an obstacle to it.

Electrode Storage, Handling and Consumable Care

Ask any experienced stick welder what ruined their last job and you will rarely hear about amperage. You will hear about a soft rod, a pitted bead, a repair that cracked open three weeks later. It all traces back to how the electrodes were stored.

A Stick Electrode Is a Chemical Product, Not Just a Wire

A stick electrode is a mild steel core wrapped in a coating that must survive storage, then perform at welding temperature. That coating does the shielding, deoxidises the weld metal, adds alloying elements and forms the slag you chip off. Moisture carried into it dissociates during welding and feeds hydrogen into the molten pool. Hydrogen causes most cracking problems: it makes the deposit brittle, raises hardness and creates the conditions for hydrogen-assisted cracking in restraint-sensitive joints. That is why a good E7018 weld and a poor one often differ because of the oven, not the technique.

Cellulosic electrodes sharpen the point. E6010 and E6011 coatings are deliberately high in hydrogen, which is what gives them excellent penetration and forgiving behaviour on dirty, rusted or painted steel. That same content means they demand careful moisture control and are a poor choice for restrained or code-governed work.

Low-Hydrogen Electrodes and the Holding Oven

Basic and low-hydrogen coatings containing calcium fluoride are hygroscopic, meaning they pull moisture straight out of the air. A coating left in a humid shop can absorb enough in one shift to produce a weld full of porosity and a hydrogen-riddled deposit prone to cracking.

This is why AWS D1.1 practice requires low-hydrogen electrodes to be held in a heated oven, typically at roughly 120 to 150 degrees C (250 to 300 degrees F). Electrodes left in ambient humidity for more than about four hours are commonly re-baked for one hour in the 260 to 430 degrees C (500 to 800 degrees F) range before returning to service. The AWS A5.1/A5.1M:2025 standard reinforces this with rules on sizes, marking, manufacturing, packaging and the moisture tests used to qualify low-hydrogen coverings. The AWS Welding Handbook chapter on electrode handling makes the same case.

For ordinary electrodes in humid climates, keep the rod temperature between roughly 60 and 250 degrees F. It is no substitute for a proper oven on low-hydrogen rods, but it keeps cellulose and rutile sticks usable far longer than an open carton.

How to Spot a Damp Electrode on the Bench

You do not need a laboratory to know your rods are wet. Look for these telltale signs:

• Coating damage: cracked, blistered, pitted or discoloured coating, or white powdery residue on the rod.
• Spatter at strike: the rod spits and pops the instant you touch it to the work.
• Unstable arc: the arc sputters and wanders instead of settling into a steady buzz.
• Heavy fume: noticeably more smoke than usual for that electrode.
• Porosity in the bead: gas holes along the weld, sometimes with a dull, rough surface.

AWS and the TWI manual metal arc process guide treat moisture control as a core consumable discipline, because a wet electrode makes every other setting decision irrelevant.

Storage Discipline That Actually Works

Start with the cardboard box. Electrodes arrive in moisture-resistant packaging, and that packaging only helps while it is intact.

• Keep rods in their original packaging or in a rod oven, never loose in an open bin.
• Store them off the floor and away from damp exterior walls, since concrete and masonry wick moisture into the room.
• Rotate stock so the oldest rods are used first, and write the purchase date and electrode type on the box.
• Keep the oven plugged in over weekends and holidays. A cold oven is worse than no oven, because it gives false confidence.

Handling the Consumable and the Holder

Storage is only half of it. Before you strike, check the classification stamped on the core wire or printed on the package. For code work, the batch and lot number traces a weld back to a specific production run, which is why AWS A5.1 sets marking and packaging requirements instead of leaving identification to shop habit.

Your electrode holder matters too. Use one sized for the rod, with jaws that grip firmly. A worn or oversized holder lets the rod move in the clamp, creating poor electrical contact, heat in the holder and an erratic arc that gets blamed on the machine. It is also a safety problem, because the live rod can twist in your hand. If you are moving to a different kind of work, the all-position welding rod guide helps match the consumable to the position you are about to weld in.

Most weld quality problems get diagnosed at the machine, when the real cause was the cabinet in the corner. Treat electrodes like the chemical product they are and plenty of defects simply stop appearing.

Common Mistakes and How to Troubleshoot Weld Defects

The bead looks rough, the plate is not fully joined, or there are little black specks in the joint. Now what?

Start with the vocabulary. A discontinuity is any interruption in the physical structure of a weld: porosity, cracks, incomplete fusion, undercut, overlap, slag inclusions. A defect is a discontinuity that exceeds the acceptance criteria set by the applicable code for that joint classification and loading type. The same porosity bubble may be acceptable in a non-critical fillet weld and a rejectable defect in a pressure joint. The metal does not know the difference. The code does.

Under AWS D1.1, cracks of any type are rejectable under virtually all structural code requirements, and incomplete fusion plus incomplete joint penetration in a groove weld designed for complete joint penetration (CJP) are rejectable as-found, because they cut the effective throat and stress the load path exactly where it concentrates.

The good news is that stick welding defects rarely come from nowhere. They trace back to a handful of identifiable causes, and once you can name the cause, the fix is usually simple.

Porosity

Gas trapped in the weld metal: tiny craters or bubbles, a dull cratered surface, heavy spatter. On a fracture test it looks like a sponge. Causes: moisture in the electrode coating (water decomposes into hydrogen and oxygen during the arc, and the gas is trapped in a rapidly freezing puddle), contaminated or wet base metal such as oil, paint, rust or cutting fluid, excessive arc length that lets the shielding gas absorb air, and arc blow or drafts from an open shop door. Fix: dry the electrodes properly, clean the joint back to bright metal, hold the arc at roughly one electrode diameter, and screen the work from wind. If porosity persists, check that the work clamp sits on clean bare steel and the ground connection is good.

Undercut

A groove melted into the base metal at the toe of the bead, where the reinforcement meets the plate. It is a stress raiser and one of the most common reasons a weld is rejected. Causes: excessive amperage for the electrode diameter, an arc held too long, or too much travel angle dragging the electrode so the arc points away from the joint. Undercut is permitted only to limited depths for statically loaded members, with tighter limits for cyclically loaded connections. Fix: lower the amperage, shorten the arc, correct the drag angle, and watch the toe as you work. A steady sound, a flat bead, and a clean toe on both sides is the target.

Lack of Fusion and Cold Lap

The weld metal did not bond to the base metal or to the previous pass. Cold lap is the milder version: the surfaces met but did not melt together, leaving a weak, unmelted boundary. A CJP groove weld that only partially penetrates is a defect, not a shortcut. Causes: amperage too low, travel speed too fast, arc too long, and dirty or poorly prepared joint surfaces. Shallow penetration improves by decreasing welding speed, increasing current, or stepping down to a smaller electrode. Poor sidewall or root fusion traces to low current, contaminated surfaces, or an improper electrode for the base metal. Incomplete root fusion or penetration is more likely in consumable electrode processes such as MIG, because the welder has less independent control over pool penetration than a stick welder does. Fix: raise the amperage into the middle of the electrode’s rated range, slow travel until you see the puddle properly, and verify the joint prep. If you are not sure you achieved full penetration, do not ship it as a CJP joint.

Slag Inclusion

Slag trapped inside the weld metal. It weakens the joint and shows on a radiograph as a dark streak or spot. Causes: incomplete slag removal between passes, and weaving low-hydrogen electrodes such as E7018 so aggressively that flux gets folded into the pool. That coating produces a heavy, tenacious slag that does not self-peel the way cellulosic coatings do. Fix: chip every pass thoroughly, then wire brush the joint before the next bead. Avoid aggressive weaving. A flap disc or a grinder with a light touch is quicker than fighting a chipping hammer all afternoon.

Spatter

The orange-brown spray of molten droplets that sticks to the plate and the electrode holder. It wrecks appearance and raises cleaning costs even when the weld itself is sound. Causes: too high a welding current, a long arc, or arc blow. On painted or dirty steel, spatter also comes from the coating burning off, another reason to clean the joint first. Fix: lower the amperage, shorten the arc, reposition the work clamp, and switch to AC if arc blow is the culprit.

Hot Cracking

Cracking while the weld is still hot, as the metal contracts. It is a centreline or interdendritic crack in the weld or the heat-affected zone. Causes: high restraint, high sulphur or carbon in the base metal, and excessive heat input. Slower travel, more amperage and a hot joint conspire to trap a continuous grain boundary that cannot stretch as the bead shrinks. Fix: preheat the base metal, use a controlled tacking sequence so the joint is not locked in a distorted state, reduce restraint where the design allows, and control heat input so you are not pouring metal into the joint faster than it can cool.

Cold Cracking

Cracks that appear hours or days after welding, not while the bead is still glowing. Three ingredients have to be present together: a susceptible material (high-strength or high-carbon steel), stress, and hydrogen. Fix: use a low-hydrogen electrode, keep it in the holding oven, preheat the joint, and control heat input. Controlling hydrogen is the part you can do most about, and it is why electrode storage discipline exists at all.

Arc Blow

The DC arc magnetically deflected out of the joint. You know it when the arc wanders and spits, with a crackling hiss instead of the steady buzz of a stable arc. Causes: DC magnetising the work plus poor work clamp placement. The magnetic field is strongest at the edges of the workpiece, so arc blow is worst near a corner or edge. Fix: switch to AC, move the work clamp close to the arc, and orient your welding direction so you work toward the clamp rather than away from it.

Electrode Sticking

The electrode touches the pool, freezes, and welds itself to the work. Causes: too low an amperage for the electrode diameter, wrong polarity, or resting the rod in the puddle instead of hovering over it. Fix: raise the amperage, check the polarity setting, and lift the electrode. Never press harder. If it sticks, twist it free, break it off, and re-strike.

Quick Reference: Symptom to Cause to Fix

Symptom	Most likely cause	Corrective action
Porosity, cratered surface	Wet electrode, dirty base metal, long arc, draft	Dry rods, clean to bright metal, shorten arc, shield from wind
Undercut at the toe	Excess amperage, long arc, too much travel angle	Lower amps, shorten arc, correct drag angle
Cold lap, lack of sidewall fusion	Amps too low, travel too fast, dirty joint	Raise amps, slow down, re-prep the joint
Shallow penetration	Low heat input, small electrode, fast travel	Slow travel, raise current, or use a smaller rod
Slag inclusion	Slag left in the joint, weaving E7018	Chip and brush between passes, weave less
Spatter	High current, long arc, arc blow	Lower amps, shorten arc, move clamp, try AC
Crack while hot	High restraint, high sulphur, excess heat	Preheat, controlled tacking, less heat input
Crack after cooling	Hydrogen, stress, susceptible steel	Low-hydrogen rod from a hot oven, preheat
Arc wandering or hissing	Arc blow on DC	Use AC, clamp nearer the arc, weld toward clamp
Electrode freezes to the work	Amps too low, wrong polarity, rod in the puddle	Raise amps, check polarity, lift the rod

Worth knowing: AWS A5.1 covers weld metal soundness and includes usability tests, which is how electrode behaviour gets qualified rather than assumed. A rod that is in spec will not fix a dirty joint, but it takes the consumable out of the argument.

I’ll rewrite this section, tightening the prose while keeping every fact and link, and expanding where useful to hit the target range.

Manual Arc Welding vs MIG and TIG: Choosing the Right Process

Every shop has a favourite process. Sometimes the favourite is genuinely right. Sometimes it is simply the machine already bolted to the bench. Manual arc welding (SMAW) trades speed and cosmetic finish for independence: no gas cylinder, no bare clean metal, no factory-grade equipment. MIG (GMAW) trades that independence for speed and throughput. TIG (GTAW) buys control with time, coordination and a steeper learning curve.

Here is the honest comparison, then a scenario guide, so you can pick the process that matches the job rather than the one you happen to own.

Factor	Manual Arc (SMAW)	MIG (GMAW)	TIG (GTAW)
Shielding	Flux coating, no gas cylinder	Shielding gas (argon/CO2 mix)	Shielding gas (argon)
Filler feed	Consumable electrode in a holder	Continuous wire from a feeder	Separate filler rod fed by hand
Deposition and efficiency	Slow, roughly 25% operating factor	Fastest, highest deposition rate	Slowest, lowest deposition rate
Slag	Yes, chipped off between every pass	Minimal slag, some spatter	None
Heat and bead control	Indirect, via amperage and travel speed	Good, adjustable on the machine	Excellent, via foot pedal
Dirty or rusty base metal	Forgiving	Fussy, porosity likely	Very fussy, must be clean
Wind and drafts	Not a process-killer	Defeated by drafts	Defeated by drafts
Material thickness	About 1/8 in and thicker	Thin to thick	Thin to medium, strongest on thin
Position capability	All positions with one electrode	All positions	All positions, hardest overhead
Weld appearance	Functional, slag-covered	Clean, needs spatter removal	Cleanest, cosmetic grade
Equipment cost	Lowest	Moderate, plus gas supply	Highest
Consumable cost	Low, electrodes are cheap	Moderate, wire plus gas	Moderate to high
Learning curve	Moderate, very forgiving	Easy to start, needs setup discipline	Steepest of the three

Where MIG Earns Its Keep

MIG is the fastest of the three. Continuous wire feed means you rarely stop, spatter is light, and slag is a non-issue, which makes it far easier on the operator during a long production run. It is also the cheapest way to put metal on a trailer frame or a run of production weldments.

The catch is that MIG depends entirely on its shielding gas. A cross-draught or even a light breeze can displace that gas and leave you with a porous, ugly deposit. MIG also wants clean metal: rust, paint and mill scale on the joint will spit gas into the weld and produce porosity. Gas-shielded processes simply need an atmosphere you can control, and shielding must be checked before the arc is struck rather than after the first pass goes bad.

Where TIG Earns Its Keep

TIG (GTAW) gives the cleanest, most controllable weld of the three. It is the standard for root passes on pipe, for thin material, and for stainless steel and aluminium where surface appearance matters. There is no filler in the arc, so you feed the rod separately with one hand, hold the torch with the other and manage heat with your foot. That three-way coordination is the whole skill, and it is why TIG has the lowest deposition rate and the longest learning curve.

For aluminium in particular, success hinges on preparation and gas setup, which our aluminum MIG welding guide covers in detail, while aerospace work pushes TIG standards further still in our aerospace TIG welding reference.

Where Stick Still Wins

Manual arc welding needs no gas cylinder at all, so wind never stops the job. It tolerates painted, rusted, galvanised and generally dirty surfaces where nobody wants to grind first, which is exactly the situation described in our advantages of stick welding breakdown. One electrode covers all positions, and low-hydrogen grades such as E7018 are specified for mild and low-alloy steels, high-strength structural steel, plate fabrication, shipyards, pressure vessels and piping.

Stick also runs off a generator or a plain transformer in the field, with nothing more exotic than a all-position welding rod in the holder. For code work, structural steel and pressure applications, the same welder and process must be qualified to the applicable standard and written procedure. That qualification is what makes a stick weld on a bridge or pressure vessel acceptable where an unproven process would be rejected outright.

Where Manual Arc Welding Loses

Be honest about the trade-offs. SMAW has an operating factor of roughly 25%, meaning only about a quarter of operator time is spent actually welding; the rest goes to electrode changes and slag removal. That slag is the main cleaning burden, and it must come off completely between passes or the next weld will be contaminated.

Stick below about 1/8 inch material and you are gambling with burn-through. Deposition quality is heavily dependent on welder skill, and the finished bead will never match TIG for appearance. On thin sheet or on work where the joint has to look good to the customer, that is a real limitation rather than a matter of taste.

Decision Guide by Scenario

• Farm gate repair: Stick, every time. Rusted steel, outdoors, no gas, no clean metal.
• Trailer frame: MIG. Repetition, thicker sections, clean pre-grind steel, throughput matters.
• Pressure pipe root pass: TIG for the root, then SMAW fill and cap with a low-hydrogen electrode such as E7018.
• Stainless handrail: TIG. Cosmetic surface, low heat input, clean passivation layer.
• 16-gauge sheet-metal bracket: MIG or TIG. Stick is too hot for material this thin.
• Structural bridge repair: Stick with E7018, qualified to the applicable code, working to a written procedure.

Learning Path, Certification and Getting Better Fast

Reading an electrode code is not the same as laying a bead that passes inspection. That gap is where most self-taught welders stall.

A Progression That Actually Works

Start on flat coupons of scrap mild steel, 3/32 and 1/8 inch thick. No joint prep, no awkward positions, just a straight bead on a plate you can afford to ruin. Skip this and you regret it.

1. Learn one electrode deeply before juggling many. E6013 is the best training rod for thin and general work: its arc is easy to hold and its slag peels off. E7018 is the structural and code workhorse. E6011 is the one to master for dirty field work where nobody wants to grind the steel.
2. Master flat and horizontal before vertical-up and overhead. A flat bead teaches arc length, travel speed and puddle control without gravity and molten metal falling into your lap. Revisit this all-position rod guide once your flat bead is consistent, because position changes how you feed the electrode.
3. Practise arc striking until it becomes boring. Honestly boring. Twenty strikes a session on scrap until the strike-and-hold motion stops making you think. Striking is where beginners waste half a rod and half their confidence.
4. Learn to read your own bead. The finished bead is a better diagnostic instrument than any gauge. Crown height, bead width, penetration, spatter and slag profile tell you what your arc and amperage were doing.

Still weighing the process? Our piece on the advantages of stick welding makes the case for manual arc welding.

Why Certification Is Process-Specific

Professional qualification is governed by ASME Section IX of the ASME Boiler and Pressure Vessel Code and by AWS D1.1 for structural work. A welder qualified on SMAW is not automatically qualified to weld GMAW or GTAW. Each process needs its own performance qualification test, or WPQ, and each job needs a qualified welding procedure specification, or WPS, backed by a procedure qualification record, or PQR. In plain terms, the WPS tells the welder how to run the job, and the WPQ tells the code this welder can run it.

ASME Section IX clauses QW-402 through QW-410 define the essential and supplementary essential variables that must stay inside their qualified limits. Push the process, filler metal classification, welding position, joint design, backing or base material beyond those limits and the qualification no longer covers the work, so the welder must be re-qualified. AWS D1.1 applies the same logic to structural welds. Read the code, not a forum post.

For structured theory before you burn more electrodes, AWS Learning publishes the Welding Fundamentals I learning pathway, covering the major processes with their advantages, limitations and quality characteristics. It is a recognised starting point rather than a random video series.

The Shop Habits That Separate Consistent Welders

• A written procedure. A card at the station listing electrode, amperage, polarity, positions and bead width.
• A settings log. Write down what worked; a two-minute note saves an hour of guessing next month.
• The electrode oven running. Low-hydrogen rods in a cold shop are a false economy waiting to happen.
• A fire extinguisher within reach. OSHA’s hot work rules cover the fire watch, area check and post-work monitoring. See OSHA 1910.252 for the full requirements.
• A grinder and chipping hammer at the station. Cleaning between passes is not optional.
• Never weld a joint you have not dry-fitted. Fit-up errors cause most of the defects that trip up new welders.

Safety belongs on that list too. AWS A5.1/A5.1M:2025, approved by ANSI on September 30, 2024 and revising the 2012 edition, requires users to establish an appropriate safety program addressing the risks of welding and meeting applicable regulatory requirements. Compliance is live, not a box you tick once.

Key Takeaways

1. Constant current, correct polarity, work clamp close to the joint.
2. Match electrode to joint and position; check the manufacturer’s range.
3. Keep low-hydrogen rods in a heated oven; re-bake anything exposed to humidity.
4. Short arc, steady travel, let the electrode melt down rather than push it.
5. Clean every pass with a chipping hammer and wire brush.
6. Local exhaust first for fume, respiratory protection as the supplement.

Master manual arc welding and you own a process that handles a gate, a trailer frame, a pipe root and a structural connection with the same tool and no gas cylinder. That versatility is why welders who learn it properly get called when the job is genuinely difficult.

Frequently Asked Questions

What is manual arc welding, and what are the other names for it?

Manual arc welding is the process of joining metals with an electric arc struck between a flux-coated consumable electrode and the workpiece. AWS calls it shielded metal arc welding (SMAW); the international term is manual metal arc welding (MMA or MMAW), and ‘stick welding’ is the common trade nickname derived from the electrode itself.

What is the difference between DCEP and DCEN, and which should I use?

DCEP (reverse polarity) puts more heat into the workpiece, giving deeper penetration, and is the correct choice for E6010 and E7018 electrodes. DCEN (straight polarity) puts more heat on the electrode, increasing melt rate and reducing penetration. Many electrodes such as E6013 and E7014 work on either polarity, so check the electrode packaging.

Why does my electrode stick and why does the arc keep breaking?

Sticking usually means the amperage is too low for the electrode diameter, the polarity is wrong, or the rod was held still in the puddle rather than being allowed to melt. To start cleanly, either lightly scratch the tip across the work like striking a match or hold just above the surface and tap down like a pool cue, then lift slightly.

What amperage should I use for a 1/8 inch E7018 electrode?

A 1/8 inch E7018 is generally rated around 90 to 160 amps, with many manufacturers quoting roughly 110 to 165 amps. Plate thickness then trims the range: quarter-inch plate sits nearer 110 to 125 amps. Always start from the range printed on your electrode container, since it supersedes generic charts.

Do I need a special oven to store E7018 electrodes?

Yes, a holding oven is the standard practice for low-hydrogen electrodes such as E7018 because their calcium-fluoride coating is hygroscopic and moisture drives hydrogen cracking. AWS D1.1 practice holds them at roughly 120–150 °C (250–300 °F), and electrodes exposed to humidity for more than about four hours are commonly re-baked for an hour at 260–430 °C before use.

Is stick welding safe for thin sheet metal?

It is risky. Manual arc welding has limited applicability below roughly 1/8 inch because excess heat causes burn-through, and a 1/16 inch E6013 is typically run at only about 20 to 45 amps. For thin material, MIG or TIG usually gives far better control, though a 1/16 inch E6013 with light technique can work for light-gauge mild steel.

How do I remove slag between passes?

Let the bead cool until the slag is brittle, then knock it off with a chipping hammer and clean the bead with a wire brush. Leaving any slag behind is the classic cause of slag inclusion, which is an embedded defect that can crack under load. Do not start the next pass until the previous one is clean and cool enough to handle.

Is manual arc welding better than MIG or TIG?

It depends entirely on the job. Manual arc welding wins in the field, on dirty or painted steel, where there is no gas supply, and for all-position structural and pressure work with low-hydrogen electrodes. MIG is faster for production runs and TIG produces the cleanest, most cosmetic welds on thin, stainless and aluminium work. Choosing the process that matches the job beats choosing the one you already own.

What causes hexavalent chromium exposure, and what is the legal limit?

Chromium in stainless steel and chromium-bearing alloys is converted to its hexavalent state by the heat of the welding process, and the resulting fume is highly toxic and carcinogenic. OSHA’s permissible exposure limit is 5 µg/m³ as an 8-hour time-weighted average with a 2.5 µg/m³ action level, while NIOSH recommends the far more protective 0.2 µg/m³ REL. Local exhaust ventilation close to the plume is the primary control.

Do I need to be certified to weld commercially?

For code-governed work such as structural steel, pressure vessels and pipelines, yes. Qualification is process-specific under ASME Section IX and AWS D1.1, so an SMAW performance qualification test does not automatically qualify you for MIG or TIG, and a qualified welding procedure specification supported by a procedure qualification record is normally required as well.