Shielded Arc Welding: Definition, Process, and How It Works

The first time someone hands you a stick electrode, it feels like a trick: no gas bottle, no wire feeder, just a metal rod with a rough coating and a ground clamp. Then the arc cracks open, the coating starts smoking, and a shell of slag forms over the puddle — and you realize you are not just melting metal, you are manufacturing your own protective atmosphere. That coating is the whole idea behind shielded arc welding, and once you understand it, every rod choice and amp setting starts to make sense.

Shielded Arc Welding, Defined in Plain English

Shielded arc welding is an arc welding process in which an arc burns between a flux-covered consumable electrode and the weld pool, while the decomposing covering supplies the gas and slag that protect the molten metal from the atmosphere. That is the technical answer. In a working shop, the same process is usually called stick welding, and the rod in your hand is doing two jobs at once: carrying current and manufacturing the protection that keeps the weld clean.

The formal definition comes from AWS A3.0, Standard Welding Terms and Definitions, which describes shielded metal arc welding as an arc welding process with an arc maintained between a covered electrode and the weld pool, where the electrode covering provides the shielding. The covering is not a handle or a cosmetic jacket. As the arc burns, the flux decomposes into a protective gas envelope, melts into a slag blanket over the cooling bead, and releases elements that help deoxidize and refine the puddle. Remove the covering and you no longer have shielded metal arc welding. You have a bare wire arcing in open air.

The Umbrella Term vs. the Shop Term

Here is where beginners get tangled. “Shielded arc welding” is also used as an umbrella term for any arc process where the arc or weld pool is protected from the atmosphere. By that broad definition, gas metal arc welding and gas tungsten arc welding are shielded arc processes too. But when a modern article, supply catalog, or instructor says “shielded arc welding,” they almost always mean shielded metal arc welding, the stick process defined above.

The Vocabulary You Will Hear

The names multiply because the process is old and widely used. “Stick welding” describes the straight rod. “Manual metal arc” (MMA) is the common European and British term. “Flux-shielded arc welding” and “covered electrode welding” appear in specifications and training material. They all refer to the same basic setup: a covered electrode, a constant-current power source, a ground clamp, and an operator controlling the arc by hand.

Older textbooks sometimes used “shielded arc welding” for gas-shielded processes, including inert-gas shielded arc welding. That is why a quiz can ask about “the shielded arc process” and leave you guessing. Read the context. If the question mentions a covered electrode, flux coating, or slag, it means shielded metal arc welding. If it mentions a gas nozzle or an external gas cylinder, it means a gas-shielded process.

What This Guide Covers, and Who It Is For

Common carbon steel electrodes such as E6010, E6011, E6013, and E7018 are classified under AWS A5.1, the specification for covered carbon steel electrodes. That numbering system is one of the most practical things a new welder can learn, and this guide breaks it down digit by digit.

This article is written for beginners holding a stinger for the first time, trade students preparing for certification, DIY fabricators repairing trailers and gates, and supervisors who need a clear refresher before training someone else. We will look at how the shield actually forms, why slag matters, how to read an electrode label, how to set polarity and amperage, where stick welding still wins, and which mistakes cause porosity, slag inclusions, and cracked welds.

If you are weighing processes, our guide to the advantages that keep stick welding on job sites pairs well with this definition. When you reach electrode selection, the all-position welding rod guide will help you match a rod to the joint and position. By the end, “shielded arc welding” should stop being a phrase you memorize and become a process you can picture from strike to slag.

How the Shield Works: Arc, Gas, Slag, and the Puddle

The coating on a stick electrode isn’t just there for decoration. It is the factory-built shield for your weld. With shielded metal arc welding, there is no gas bottle to turn on. Everything that protects the molten puddle has to be created on the spot from that flux coating. To understand why this matters, it helps to watch the process unfold in real time.

The Sequence From Strike to Solidification

It all starts with contact. When the tip of a flux-coated electrode touches the grounded workpiece, electricity flows between them. From there comes the arc strike, breaking that contact just enough to form a stable arc. The intense heat of that arc immediately begins the coating burn-off, vaporizing and melting portions of the flux into a cloud of gas and molten slag.

This rapidly forms a gas envelope around the arc and puddle, physically pushing away the surrounding air. As the electrode melts, metal transfer carries droplets of molten filler across the arc into the weld pool. With welding arcs for steel commonly reaching temperatures around 6,500 degrees F (about 3,600 C), that puddle is incredibly hot and wildly reactive. Finally, as travel moves forward, puddle solidification begins, and a slag covering forms over the cooling bead to insulate it.

Why Air Is the Enemy

Molten steel wants nothing to do with the atmosphere. If left exposed, oxygen and nitrogen from the air will contaminate it. This leads to porosity (tiny gas pockets throughout the weld), nitride embrittlement (where nitrogen forms brittle nitrides in the steel), and poor fusion between the filler and base metal. All three of these can drastically weaken a joint, even if it looks passable on the surface. This is exactly what the shield is built to prevent.

The Three Shields Working Together

In SMAW, protection isn’t a single action, but three mechanisms working in unison:

• Gas from the coating: As the flux decomposes, it creates a blanket of shielding gas directly around the arc. This is the first line of defense against oxygen and nitrogen.
• The slag blanket: Heavier molten flux floats to the top of the puddle, forming a glass-like layer over it as it cools. The slag blanket also slows the cooling rate, which helps protect the bead from atmospheric pickup as it freezes.
• Alloying and deoxidizing elements: Many fluxes contain elements designed to “clean” the puddle. These react with any stray oxygen before it can form oxides in the weld metal, improving soundness.

Consumable Shield vs External Shield

The biggest difference between SMAW and gas-shielded processes comes down to supply. With MIG (GMAW) and TIG (GTAW), shielding is delivered by an external gas cylinder through a nozzle. With stick, SMAW shielding is generated by the electrode covering rather than an external gas cylinder, which is why light wind affects it far less than MIG or TIG. FCAW can vary, as some wires rely on gas while others are self-shielded, but none are as forgiving of a breezy job site as a properly run stick electrode.

This practicality is one of the reasons why stick remains the go-to for many field repairs. In fact, it’s one of the many topics covered under the broader scope of advantages of stick welding when working away from a shop with ideal conditions.

Process	How The Arc Is Shielded	Wind Sensitivity
SMAW (Stick)	Flux coating on a consumable electrode generates gas and slag.	Low to moderate. Handles light wind far better than gas-shielded processes.
GMAW (MIG)	External shielding gas delivered through a nozzle to a consumable wire.	Very high. Even a slight breeze can disrupt the gas envelope.
GTAW (TIG)	External inert shielding gas delivered through a cup to a non-consumable tungsten.	Extremely high. Requires near-still air for a sound weld.
FCAW (Flux-Cored)	Either gas-shielded (external gas + flux core) or self-shielded (flux core only).	Varies. Self-shielded is more wind-tolerant, but still less forgiving than many SMAW applications.

At its core, shielded arc welding doesn’t rely on a tank to buy time against the atmosphere. It manufactures its own defense the moment the arc is struck. By combining a gas envelope, a protective slag blanket, and deoxidizing chemistry, the flux coating gives that puddle just enough time to solidify into a sound, strong weld, even out in the elements.

Reading an Electrode: What E6010, E6011, E6013, and E7018 Actually Mean

Before you strike an arc, the numbers stamped on the side of a stick electrode are telling you exactly what that rod is capable of. Learning to read them takes a minute, but it will save you from stuck electrodes, lack of fusion, and brittle welds. For the four rods that every beginner runs into, the key is understanding both the AWS numbering system and the flux inside of them.

Cracking The AWS Electrode Code

Nearly every carbon steel stick electrode you’ll buy starts with the letter E, which simply stands for electrode. From there, each digit has a job to do:

• First two digits: The minimum tensile strength of the deposited weld metal in thousands of pounds per square inch (ksi). For example, the “70” in E7018 means 70,000 psi minimum tensile strength.
• Third digit: Tells you the welding positions the electrode is approved for, as well as its general coating and current compatibility.
• Fourth digit: The most specific of the bunch. This digit reveals the exact flux type and the recommended current (AC, DC, or both). For AWS electrode classification, this last number is what separates a rod meant for a deep, digging root pass from one meant for a smooth, cosmetic fillet.

With this in mind, we can look at the real workhorses of shielded metal arc welding.

The Four Rods You’ll Actually Meet

While there are dozens of electrodes available, these four cover the vast majority of beginner and repair work.

• E6010 (Cellulosic, DC only): Packing a forceful, digging arc, E6010 is designed for direct current electrode positive (DCEP) only. Its cellulose-rich flux burns rapidly, creating a powerful gas shield and allowing for deep penetration. This is the rod you’ll see used for pipe root passes and dirty, rusted, or poorly fitted joints where you need that bite to get fusion.
• E6011 (Cellulosic, AC capable): Think of E6011 as the AC-capable version of E6010. It keeps much of that same digging action and ability to bridge gaps, but its modified cellulose flux is far more forgiving on older transformer machines. This is the go-to cellulosic rod when you don’t have a DC-capable welder.
• E6013 (Rutile, AC or DC): E6013 rutile electrodes are popular for light sheet metal and general fabrication because they restart easily and run on AC or DC. The titanium dioxide (rutile) rich flux produces a very soft, stable arc with a thin, easy-to-chip slag. Don’t expect the penetration of a 6010, but for clean plate and thin material, nothing is more unintimidating for a new welder.
• E7018 (Basic Low-Hydrogen Iron-Powder, AC or DC): This is the rod for strength and soundness. The “18” indicates a low-hydrogen, iron-powder covering usable in all positions. According to the TWI comparison of rutile and cellulosic electrodes, basic low-hydrogen coatings trade some of the raw digging ability for cleaner, stronger welds with a far lower risk of hydrogen-induced cracking. They produce a smooth arc, high deposit efficiency, and some of the nicest beads you’ll ever lay with stick.

One of the most common AC/DC compatibility traps is this: E6010 is DCEP only, whereas E6011 is the alternating-current-capable cellulosic option. Mixing these up is a recipe for an erratic, sputtering arc.

Diameter, Storage, and The Real Cost

Picking the right diameter is just as important as picking the right rod. As a rule of thumb, use smaller electrodes for thinner material to avoid burn-through, and step up as thickness increases. For most hobbyists, 1/8″ is the sweet spot, with 3/32″ reserved for sheet and 5/32″ for heavier plate.

However, none of that matters if your low-hydrogen rods are wet. E7018 electrodes are low-hydrogen and must be kept dry; industry practice is to hold opened electrodes in a heated oven around 250 degrees F. Leaving a half-open can out in a damp shop can undo every bit of hydrogen control that the basic flux was designed for. When selecting your rod lineup for more demanding, all-position welding rod applications, this storage rule is non-negotiable.

Finally, don’t be fooled by price per pound alone. A cheaper, high-spatter rod may look like a bargain, but once you factor in stub loss, slag removal time, and the amount of weld metal actually deposited, a high-efficiency rod like E7018 can often be cheaper per deposited weld metal than its budget counterpart.

Job Type To Recommended Electrode

Job Type	Recommended	Why
Pipe root / outdoor, dirty steel	E6010	Max bite and deep penetration on DCEP.
Field repair on a basic AC machine	E6011	AC-capable, forgives fit-up and surface rust.
Thin sheet, brackets, general fab (clean)	E6013	Soft arc, easy restarts, minimal burn-through risk.
Structural, code work, or high-strength steel	E7018	Low-hydrogen, all-position, strongest and cleanest for critical joints.

At the end of the day, the electrode number isn’t trivia, it’s a specification. Learn to decode it, match your rod to your machine and joint, and respect its storage requirements. Do those three things, and you’ll be able to pick the right stick for the job with confidence.

Setting Up: Polarity, Amperage, Arc Length, and Machine Reality

Everything above explains why stick welding works. This section covers the four controls you actually touch: polarity, amperage, arc length, and the machine’s honest limits. Get them right and a $300 machine runs clean beads. Get them wrong and a $3,000 machine still throws porosity and spatter.

Polarity: Where the Heat Goes

Polarity is really a heat-balance decision. In direct current, electrons leave the negative terminal and land on the positive one, dumping energy where they land. The positive side runs hotter, and that determines how a rod behaves.

• DCEP (electrode positive, or reverse polarity): the electrode runs hotter, so the coating melts and burns off properly, releasing shielding gas. About two-thirds of the heat lands in the work, giving deep fusion without melting the rod. Most covered electrodes are specified for DCEP.
• DCEN (electrode negative, or straight polarity): the work gets most of the heat and the rod stays cooler. Penetration rises, the bead flattens, and deposition efficiency improves slightly, but many coatings will not burn off cleanly. It suits specific rods and gouging, not general structural stick welding.
• AC: current reverses every half cycle, splitting heat between both sides. It wanders and hums, lets certain electrodes run on cheap transformer machines, and reduces arc blow.

Check the rod data sheet before flipping a switch. A 7018 on DCEN runs badly; a 6010 on AC will not hold an arc. For a broader reference on matching rods to positions and current types, keep an all position welding rod guide on the bench.

Amperage: Start in the Middle, Then Listen

The old rule is roughly 1 amp per thousandth of an inch of electrode diameter, but real numbers depend on coating, position, and joint thickness. Here are practical starting ranges for the three sizes beginners use most:

Electrode diameter	Typical starting amps	Best used on
3/32 in (2.4 mm)	60 to 90 A	Sheet, thin wall tube, root passes, vertical and overhead
1/8 in (3.2 mm)	90 to 130 A	General plate work, 1/4 in and up, flat and horizontal
5/32 in (4.0 mm)	120 to 170 A	Thick sections, heavy fillets, flat position only

Those are starting points, not gospel. A 1/8 inch electrode runs about 90 to 130 amps depending on type and position, with 3/32 lower and 5/32 higher. Vertical and overhead work sit at the bottom of the range so the puddle does not drop.

Now read the symptoms:

• Too little current: the arc stutters, the rod sticks and freezes to the plate, the bead sits tall and narrow, and fusion at the toes is lazy. Slag peels hard because it never got hot enough.
• Too much current: the rod glows red above the flux, the coating burns away early, spatter flies, undercut appears at the edges, and thin metal disappears into a keyhole.
• Right current: a crisp, steady hiss, the coating burns back evenly into a slight crater cup, the puddle wets out, and the slag lifts cleanly.

Arc Length, Travel Angle, and Drag

Arc length is commonly held at roughly the diameter of the electrode’s bare core wire, so a 1/8 inch rod wants about 1/8 inch of gap. Too long and the arc spreads, the shield disperses, spatter climbs, and the bead flattens. That is long-arcing, the classic beginner error. Too short and the rod stubs out and sticks.

Angle matters just as much. Hold about a 10 to 15 degree drag angle in the direction of travel, tilting the rod so arc force pushes metal into the joint instead of piling it up. Work angle splits the joint: 45 degrees into a T-fillet, backing toward vertical as one leg gets thinner. Drag, not push, is normal for stick because dragging keeps the coating’s gas cup over the puddle.

Duty Cycle: The Number Nobody Reads

Duty cycle is rated over a 10-minute period. A machine rated at 60 percent at 130 amps gives you 6 minutes of arc time before it needs 4 minutes to cool. That is the design operating point, not a suggestion. Weld past it and thermal protection cuts the arc out mid-bead.

Small 120-volt machines derate hard because they run near their input limit. That same class of box might be rated 100 percent at 90 amps but only 20 percent at its advertised maximum. The top dial number is marketing; the duty cycle chart is engineering.

The Setup Checklist

1. Confirm rod, polarity, and current type match the data sheet.
2. Set amps from the table, then fine-tune on scrap of the same thickness.
3. Bare metal within 1 inch of the joint; grind mill scale, rust, and paint.
4. Ground clamp solidly on clean bare steel, close to the work, never on paint or grease.
5. Inspect the stinger: cracked jaws, burnt insulation, or a loose cable lug cause instability no amp setting fixes.
6. Check cables for nicks and keep the return lead short and thick.
7. Set lens shade, gloves, jacket, and fume control before striking an arc.

Arc instability is often hardware, not technique. Long, thin, coiled cables drop voltage; a ground clamp biting into slag makes a hot, sputtering connection; a worn stinger arcs inside its own jaw. If a machine that ran fine yesterday suddenly hisses and stutters, check the cables and ground before you touch the dial. For comparison shopping on machines and consumables, this look at the real advantages of stick welding helps frame the budget.

If you are weighing electrode families during setup, alloy and stainless work follow the same polarity logic but with stricter storage rules, as covered in this guide to alloy steel welding electrodes. Get polarity and amperage honest first; the rest of the setup follows.

Where Stick Still Wins: Real Applications and Benefits

Pull up to a muddy pipeline right-of-way in February and you will see it: a welding truck, a generator, a stinger, a ground clamp, and a can of electrodes. No gas bottle, no spool gun, no shielding curtain. The welder strikes an arc in a crosswind that would send a MIG puddle into a bird’s nest of porosity, and the root pass goes in clean.

That scene repeats itself every day across the trades, and it explains why a process that predates the Second World War still holds ground. Stick welding does not compete with wire processes on speed or cosmetics. It competes on where the work happens and what the conditions are.

The Scenes Where SMAW Makes Sense

A structural ironworker tying in a column splice 40 feet up does not want to haul a gas cylinder up a ladder. An electrician’s helper welding a new hinge back onto a farm gate has 15 minutes and one extension cord. A homeowner repairing a cracked trailer frame in a driveway with the wind gusting has no way to build a shielding enclosure. In each case, the shield is generated at the arc itself, which is why stick welding remains usable in breezy outdoor conditions where gas shielding can be blown away.

The equipment footprint is the other half of the story. SMAW needs no shielding gas cylinder or wire feeder, so a complete setup is a machine, a stinger, a ground clamp, and cables. That is a smaller investment than a MIG machine plus gas, regulator, and consumables, and it fits in the trunk of a car.

Industries That Still Depend on It

• Structural steel erection: field connections, column splices, and moment welds governed by AWS A30M requirements.
• Pipeline construction: root passes, hot passes, and tie-ins.
• Maintenance and repair: the bread and butter of every mill, mine, and plant.
• Shipbuilding and marine repair: heavy plate, awkward access, outdoor air.
• Pressure piping: where procedure qualification and electrode control matter more than speed.
• Agriculture: equipment repair done in the field, often on rusty, dirty steel.

Pipeline work deserves a closer look because it looks like a holdout to outsiders. Cellulosic electrodes remain the standard for root passes because they produce deep penetration and a fast-freezing slag, which holds the bead in place on a vertical or overhead root and lets the welder push a full penetration pass without burn-through. The comparison between cellulosic and rutile behavior is well documented by TWI’s technical guidance.

The Economics for Hobbyists and Small Shops

For a beginner or a one-person shop, stick is the cheapest legitimate entry into arc welding. One machine, one stinger, one ground clamp, and a box of electrodes gets you welding steel from 1/8 inch sheet up to heavy plate. Stick handles a broad thickness range on a single machine, from thin sheet with small electrodes to heavy plate with multiple passes, which is unusual value per dollar. Electrodes are sold at every farm store, hardware store, and welding supply, and they do not expire in the way a gas bottle empties.

The other advantage is diagnostic. A maintenance welder called out to a cracked implement hitch does not reach for a wire feeder first. Stick lets you watch the puddle, feel the arc through the stinger, and change current, angle, or travel speed in the same second you see a problem forming. On unknown, dirty, or previously repaired steel, that real-time feedback is worth more than deposition rate.

None of this makes stick better than MIG or TIG in absolute terms. It makes it the right answer for a specific set of conditions: outdoors, remote, dirty, thick, variable, and urgent. That set of conditions turns out to be most of the welding work in the world.

The Honest Downsides: Slag, Speed, Distortion, and Hydrogen

Stick welding earns its keep in the field, but it does not come free. Every advantage has a matching cost, and the welders who improve fastest understand why those costs exist. Slag is not just mess to clean up; it is a solid chemical layer that has to be mechanically removed, pass after pass. Slow deposition is not laziness; it is a direct consequence of stopping every few inches to change a rod. And hydrogen cracking is not bad luck; it is a measurable metallurgical event with a known cause and a known fix.

Each limitation makes more sense once you see the mechanism, because the workaround usually follows. For the counterweight, our breakdown of the advantages of stick welding explains why the process survives anyway.

Slag: The Price of Self-Shielding

The flux coating that protects the puddle leaves a glassy or crusty slag layer that must be chipped and brushed before the next pass. On a multi-pass groove weld, that cleaning step repeats for every pass. Skip it and you trap slag between layers, creating a slag inclusion. That planar defect acts like a crack starter under load.

Cleaning also consumes time and consumables: chipping hammers, wire wheels, grinder discs, and the labor hours to run them. On a long structural weld, inter-pass cleaning can eat a meaningful share of total arc-on time. This is the biggest reason wire-feed processes out-produce stick in fabrication shops.

Deposition Rate and Electrode Waste

Stick welding is stop-start by design. You weld down to a stub, break the arc, knock off the spent flux, chuck a new electrode, restrike, and re-establish the puddle. Each cycle loses time and heat.

The bigger number is deposition efficiency, the fraction of the electrode that actually becomes weld metal. For SMAW it typically lands in the 55 to 65 percent range because of stub loss, spatter, and flux weight. Wire-feed processes push well above that. In practical terms, a pound of stick electrodes puts noticeably less than a pound of metal into the joint.

Process	Typical deposition efficiency	Cleaning burden	Arc-on time lost to stops
SMAW (stick)	55–65% (stub and spatter loss)	High: chip and brush every pass	High: rod changes every ~9–14 in.
GMAW (MIG)	High, near-continuous wire feed	Low: light spatter, no slag	Low: long continuous runs
FCAW (flux-core)	High, continuous feed	Moderate to high: slag still present	Low: continuous runs

FCAW keeps the slag penalty while gaining the deposition rate. That trade is why flux-core dominates outdoor structural work where volume matters. If you are weighing wire options, our guide to aluminum flux core welding shows where similar trade-offs play out in a different base metal.

Manual Skill Dependence and Spatter

Stick welding has no automatic feedback loop. Arc length, travel speed, work angle, and current are all held by your hand and your eyes. A momentary lapse in arc length changes the shielding, cools the puddle, and can introduce porosity. That is why the process is described as highly operator-dependent. The machine does not correct you.

Spatter is likewise unavoidable. Short arcs, damp electrodes, excessive current, and incorrect polarity all throw molten droplets that fuse to surrounding metal. Spatter removal is grinding time, and grinding time is money.

Thin Material, Burn-Through, and Distortion

Stick welding concentrates a lot of heat into a small area. On thin gauge, that heat has nowhere to go, and burn-through happens fast, often on the first restrike after a rod change when the plate is already hot. Repeated restarts compound the problem because each one dumps extra heat into the same region.

Distortion is the slower cousin of burn-through. Concentrated heat causes localized expansion and contraction, pulling the part out of square. Long straight welds on thin plate bow toward the weld. The fixes are procedural: backstep (weld short segments stepping backward), balanced sequencing (alternate sides of a joint), skip welding (jump around to spread heat), and clamping or fixturing to hold geometry while it cools.

Hydrogen: The Slow, Silent Failure Mode

Hydrogen is the most important downside because it does not announce itself. It can enter the weld pool from moisture in the electrode coating, moisture or oil on the workpiece, and humid air. Once dissolved in molten metal, it stays in solution as the weld solidifies, and then it tries to leave.

In ordinary mild steel, that is usually tolerable. In high-strength, thick-section, or hardenable steels, trapped hydrogen diffuses to stress concentrations and can cause delayed cracking, sometimes hours after the weld has cooled and the welder has gone home. This is hydrogen-assisted cold cracking, and it is why low-hydrogen electrodes exist.

Low-hydrogen electrodes such as E7018 use a basic coating with very little hydrogen-bearing material. But the classification is only as good as the handling. An exposed 7018 absorbs moisture from the air and stops being low-hydrogen.

Preheat is the other half of the defense. Warming the base metal slows the cooling rate, giving hydrogen time to diffuse out before the weld metal hardens and becomes susceptible. For hardenable steels, preheat and inter-pass temperature control are specified by code. See AWS A30M/A30.3M guidance, and note that OSHA 1926.353 addresses ventilation and health protection during welding operations of this type. Electrode selection details live in our alloy steel welding electrodes guide.

None of this makes stick welding a bad process. It makes it a process with a specific operating envelope, and welders who respect that envelope get welds that last decades.

Safety That Actually Matters: Fume, Arc Flash, and Burns

For all of the talk about puddles and electrodes, the hazards of shielded arc welding are the ones that will hurt you the longest after the arc is out. The sparks are easy to see, however, the fume, radiation, and extreme heat are what require the most discipline. With stick welding in particular, safety isn’t optional gear, it’s an engineering requirement.

Welding Fume: The Invisible Hazard

Every time the flux coating on a stick electrode burns, it produces welding fume. For mild steel electrodes, the majority of that fume is iron oxide, however, manganese is also present and is of the most regulatory concern. For stainless steel or alloy steel welding electrodes and hardfacing rods, the fume composition can expand to include hexavalent chromium and nickel, both of which carry far more severe long-term health effects.

These exposures have been studied heavily by NIOSH, as overexposure to welding fume can lead to metal fume fever, reduced lung function, neurological effects, and an increased risk for certain cancers depending on the alloy being welded. Of specific note, OSHA sets a ceiling limit of 5 mg/m³ for manganese fume, making it a compound that cannot be treated as “just dust”.

The Control Hierarchy and OSHA Requirements

When it comes to fume and gases, the goal isn’t to simply cover your nose, it’s to eliminate or drastically reduce the exposure at its source. This is done by following the control hierarchy: source extraction first, then general ventilation, and only then respiratory protection as a supplement or when the first two cannot be fully achieved.

These expectations are codified under OSHA 29 CFR 1910.252 for general industry, requiring that welding fumes and gases be kept within safe limits and specifying ventilation requirements for welding spaces. For welding operations that rely on general mechanical ventilation, OSHA’s guidance cites a minimum rate of 2,000 cubic feet per minute per welder unless local exhaust hoods or welding booths are used in its place. For construction, OSHA 29 CFR 1926.353 lays out its own ventilation requirements for welders and cutters to account for those jobsite conditions. More information can be found through OSHA’s Welding, Cutting, and Brazing standards page.

Arc Flash, Radiation, and Burns

Arc welding emits intense ultraviolet (UV) and infrared (IR) radiation. This is powerful enough to cause a severe burn to the cornea known as “arc eye”, as well as painful UV burns to exposed skin. Both the welder and nearby helpers need protection from this radiation. A proper auto-darkening or fixed shade welding helmet with the correct shade for your amperage is non-negotiable, and any exposed skin must be covered by flame resistant gear.

Beyond radiation, stick welding is notorious for slag and hot electrode stubs. These can remain at extreme temperatures long after the bead is finished, and are one of the most common causes of shop burns. With that heat comes a very real fire risk. Combustibles must be removed from the work area, hot work permits must be followed when required, and a fire watch may be needed after the job is complete.

Most critically, never weld near chlorinated solvents such as degreasers or brake cleaners. The UV from the arc can react with these vapors to form phosgene gas, a highly toxic compound that can be fatal even in small amounts. Extra caution must be taken for any work in tight or confined spaces, as fume can build up exponentially with no natural airflow.

PPE Checklist: What To Actually Buy and Set Up

Item	Requirement	Notes
Welding Helmet	Correct shade for amperage	Must protect UV/IR. Nearby helpers need helmets or curtains as well.
Flame Resistant Jacket/Clothing	Long sleeves, no synthetics	Denim or FR rated gear. Avoid hoodies, polyester, or nylon.
Welding Gloves	Stick-specific, heat resistant	Thick enough for slag, yet allow for stinger control.
Safety Glasses	Under helmet at all times	For chipping slag and grinding.
Hearing Protection	As needed	Grinding and some shop environments call for it.
Respiratory Protection	Only after engineering controls	See note below. Never substitute a mask for ventilation alone.
Fire Prevention	Extinguisher & fire watch	Keep a rated fire extinguisher within reach and clear combustibles.

The bottom line is simple: control the air, block the arc, and respect the heat. For stick welding, you won’t be able to weld your way out of any of these hazards, so set up your controls before you strike your first arc.

Common Mistakes and a Field Troubleshooting Guide

Most shielded metal arc welding defects aren’t random. They’re the result of small changes in arc length, current, cleanliness, or technique. The key to fixing them is reading the puddle before touching your machine settings.

Symptom to Cause Troubleshooting

Use the table below as a quick reference for the defects you’ll run into most often on the shop floor or out in the field.

Symptom	Mechanism	Field Fix
Porosity	Loss of shielding from moisture, dirt, oil, mill scale, or a long arc.	Clean to bare metal, shorten your arc, use dry electrodes, and avoid weaving that breaks shielding.
Slag Inclusions	Slag left behind from a previous pass.	Chip and wire brush every pass, with extra attention to corners and tie-ins.
Undercut	Excessive current, poor angle, or travel speed too fast.	Drop amperage slightly, slow travel, and keep a consistent angle to wash into the toes.
Lack of Fusion	Insufficient heat input, poor joint prep, or too wide of a weave.	Use appropriate amperage, bevel thicker joints, and focus the arc on the side walls.
Spatter	Arc instability from high amperage, long arc, or incorrect polarity.	Tune amperage to range, shorten arc length, and verify polarity for the rod.
Arc Blow	Magnetic deflection of the arc on DC, often near ends or ground connections.	Use the targeted fixes listed below.
Electrode Sticking	Hard strike, low amperage, or improper polarity.	Raise amperage into range, use a controlled strike, and ensure solid holder and ground contact.
Wormhole Tracks	Severe loss of shielding from contamination or a very long arc.	Remove rust, oil, and scale, drastically shorten the arc, and limit weave width.
Cracked Welds	Hydrogen pickup, high restraint, or fast cooling, most common on harder steels.	Use properly stored low-hydrogen rods, follow preheat, avoid over-constriction, and allow controlled cooling.

Arc Blow: The Magnetic Culprit

With DC, current through the lead, work, and nearby steel creates its own magnetic field. As you near the end of a joint or your ground clamp, that field concentrates and deflects the arc away from the puddle. You’ll often see clean beads down the plate only for the arc to wander violently in the final couple of inches.

To regain control, start with a shorter arc, as less length gives the field less to push. Dropping amperage can weaken it as well. Reposition your ground to the opposite side of the joint or as far from the weld path as practical. If your machine is AC capable, switching over will alternate polarity and greatly diminish magnetic buildup. For stubborn cases, the backstep technique can disrupt a concentrated field before it takes hold. Often, a combination of these is needed.

Beginner Mistakes That Don’t Make the Table

Many of the worst habits won’t show up as a single defect, but they’ll create all of them over time. Keep an eye out for these:

• Dragging the rod: Resting the electrode on the plate snuffs the arc. Keep roughly one electrode diameter of arc length.
• Long-arcing to see better: This kills shielding and is one of the fastest ways to introduce porosity.
• Welding over mill scale and rust: These contaminants will outgas under the arc. Grind or brush down to bright, bare metal.
• Skipping slag removal: Cleaning between passes is just as necessary as striking the arc to prevent slag inclusions.
• Using damp 7018: Low-hydrogen rods absorb moisture once opened. Improper storage is the leading route to hydrogen induced cracking.
• Over-sizing the electrode: A large rod on thin metal is a recipe for burn through. Match diameter to material thickness.
• Incorrect polarity: Most stick electrodes run on DCEP, but the wrong polarity will hurt penetration and stability. Always check your rod first.
• Poor ground placement: A loose, painted, or distant ground causes voltage drop and instability. Clamp directly to clean metal as close to the joint as safely possible.
• Ignoring duty cycle: Just because a machine can reach a setting doesn’t mean it can run it continuously. Know its duty cycle to avoid forced cool downs.

The margin for error tightens even more with specialized metallurgy. For those looking beyond common carbon steel rods, resources covering alloy steel welding electrodes are worth a read.

Field Example: Troubleshooting Porosity on a Trailer Repair

A common fix: patching a cracked section of a steel trailer hitch. After laying a pass with E7018, pinholes appear along the bead after wire brushing. The instinct to crank amperage up would only make it worse.

Inspection reveals three culprits: the hitch sat in damp weather with a cracked open 7018 box, the ground was clamped feet away to heavily rusted frame metal, and the arc was kept long for visibility. All three are textbook for porosity.

The fix is methodical. Swap to dry, properly stored 7018. Grind the repair area and a fresh ground spot down to bright metal, clamping directly next to the joint. Finally, shorten the arc to roughly the diameter of the rod for a test bead. The pinholes disappear with a tight, solid weld. No machine repair, just restored shielding.

Stick vs MIG vs TIG vs Flux-Core: Choosing With Your Eyes Open

There isn’t a “best” welding process, only the best one for the job at hand. The right choice should be based off of your environment, not popularity.

Head to Head Comparison

While all four arc processes melt and join metal, their methods of shielding create vastly different strengths and weaknesses. Here’s how they stack up in real world conditions:

Category	SMAW (Stick)	GMAW (MIG)	FCAW (Flux-Core)	GTAW (TIG)
Equipment Cost	Lowest. Often the cheapest entry point.	Mid to high. Requires a wire feeder and a gas bottle.	Mid to high. Wire feeder required, gas may be optional depending on wire type.	Highest. Requires a capable TIG machine, argon, and often a foot pedal.
Learning Curve	Moderate. Easy to start, but difficult to master.	Easy. One of the simplest processes to get a decent bead on clean metal.	Easy to moderate. Very forgiving once parameters are dialed in.	Steep. Demands the most hand-foot coordination out of all four.
Deposition Rate	Low to moderate. Limited by electrode length and frequent rod changes.	High. Continuous wire allows for fast travel on production work.	Very high. Combines wire feed productivity with a large puddle capacity.	Very low. Prioritizes precision over speed.
Wind Tolerance	Excellent. Self shielded by its flux, ideal for field work.	Poor. Its external gas shield is incredibly vulnerable to drafts.	Good to excellent. Self-shielded flux-cored wires are far more draft tolerant than plain MIG.	Poor. Even the slightest breeze can disrupt its pure argon shielding.
Cleaning Burden	High. Slag must be chipped off between passes.	Very low. Little to no slag, mostly spatter to knock off.	Moderate. Many flux-cored wires produce a thin layer of slag that requires removal.	Minimal. Produces the cleanest beads with almost no post-weld slag.
Material Range	Extremely broad. Great for thick steel, rusty material, and repairs.	Great for clean, thin to medium steel. Limited outdoors without shielding.	Great for thicker steel outdoors, especially with less than pristine surfaces.	Unmatched for thin material. Excels with stainless and is utilized heavily within guides such as alloy 20 welding procedures for corrosion resistant applications.
Appearance	Functional. Strength over looks.	Clean and uniform. Great for sheet metal aesthetics.	Rougher. Generally more spatter heavy than MIG.	Pristine. By far the cleanest and most controllable appearance.

With these tradeoffs in mind, stick (SMAW) is your go to for field repairs, thick or dirty steel, and windy conditions. MIG (GMAW) shines for speed on clean, indoor sheet metal and production runs. Flux-cored (FCAW) bridges the gap, offering wire-feed productivity with far more draft tolerance than plain MIG. Lastly, TIG (GTAW) produces the cleanest, most controllable arc, but its slow travel speeds and coordination demands make it best for precision, thin material, and appearance-critical work.

Practical Tips To Make Stick Welding Click

If stick is the process you’ll rely on most for repairs, technique will always trump the price of your machine. These tips will have the largest impact:

• Practice on plate, not pipe. Flat, mild steel plate allows you to focus solely on puddle control without having to fight constantly changing joint positions.
• Run stringer beads first. Uniform stringers build the puddle reading skill needed for every stick position. Only weave once they’re consistent.
• Listen to the arc. A properly tuned arc will have a crisp crackle. Excessive popping or a frying sizzle is often a sign of long arcing or incorrect amperage.
• Keep a consistent travel speed. Too fast leads to thin beads with lack of fusion, while going too slow creates an over stacked, hard to control puddle.
• Read the front edge. Focus your eyes on the leading edge of your puddle. If it’s washing out, you’re too hot or slow. If it’s barely moving, you’re too cold.
• Use the right lens shade. Eye protection is non-negotiable for any amperage range. If you’re ever unsure of requirements, it’s worth referencing OSHA’s welding, cutting, and brazing standards as a baseline.
• Keep your chipping tools close. A slag hammer and wire brush should be within arm’s reach. Chipping between passes is mandatory to prevent welding over slag.

Skill Progression and Realistic Expectations

Improvement is predictable with a structured routine. Follow this path for the most practical results:

1. Stage 1: E6013 on flat plate (Weeks 1-2). Rutile electrodes like E6013 are incredibly forgiving with a soft arc and easy restarts. Focus on striking, arc length, and consistent stringers.
2. Stage 2: E6010 on flat plate (Weeks 3-5). Time for a more forceful, digging arc. E6010 demands tighter arc length control, making this the stage where true puddle control is tested.
3. Stage 3: E7018 vertical up (Weeks 6+). Moving to a low-hydrogen rod vertically is a big jump, but it’s the most applicable to structural and repair work. Proper storage and handling of E7018 is just as important as your technique.

Only two to four focused hours a week will be far more effective than cramming once a month. You’ll likely see uniform beads within a month, but being able to confidently lay sound welds in multiple positions can take anywhere from 6 months to over a year.

At the end of the day, no table can pick for your exact situation. If you’re fixing a trailer in the wind, patching a gate away from a gas supply, or doing repairs with no way to run shielding gas, stick will almost always be there when the others aren’t. For everything else, weigh the tradeoffs above and pick the tool that’s the least frustrating for that specific job. More often than not, that’ll be the correct choice.

Putting It Together: A Learning Path and Final Thoughts

At its core, shielded metal arc welding (SMAW) is an arc welding process in which an arc is maintained between a flux-covered consumable electrode and the weld pool, with the coating decomposing to supply shielding gases and form a protective slag blanket. The key to mastering it isn’t memorizing that definition, but accepting this simple rule: the coating is the process, the electrode number is a specification, and the technique is what turns that specification into a sound weld.

None of these pieces can carry the weight on their own. A low-hydrogen rod won’t save a puddle arcing too long, and the perfect amperage means nothing without proper cleaning between passes. It’s that interplay that makes stick welding both versatile and demanding.

Your First 30 Days: A Realistic Learning Path

A beginner can usually produce acceptable flat-position beads within a few weeks of regular practice, but vertical and overhead work takes considerably longer. With that in mind, focus on discipline over speed with this plan:

• Week 1: Safety and Setup (2-3 hours) – Get comfortable with polarity, cable connections, and your ground clamp. Practice striking an arc on scrap plate, and take time to learn about all position welding rod options for your machine.
• Week 2: Flat Beads (4-6 hours) – Stick to a rutile rod, such as E6013, on 1/4″ flat plate. Focus on arc length, travel speed, and listening to your arc. Aim for at least 20-30 stringer beads.
• Week 3: Joints and Cleaning (4-6 hours) – Move to butt and T-joints. Chip and brush slag between every pass. This is also a good time to understand how cleanliness impacts welds, specifically by looking into proper aluminum surface preparation.
• Week 4: Technique Discipline (4-6 hours) – Experiment with a cellulosic or low-hydrogen rod, paying close attention to storage and amperage. Use this time to troubleshoot the imperfections from your first three weeks.

Budgeting For Your Starter Kit

The total starter kit for stick welding can be assembled for far less than a comparable MIG or TIG setup. For those on a tight budget, this no-frills breakdown will get you going for under $375:

Item	Estimated Cost (New)	Notes
Entry-Level Stick Welder	$130 – $200	Focus on duty cycle over peak amp numbers.
Auto-Darkening Helmet & PPE	$70 – $90	Gloves, jacket, and eye protection are non-negotiable.
Tools & Consumables	$40 – $55	Slag hammer, wire brush, assorted electrodes, and scrap steel.

Next Steps To Take Your Skills Further

Once your flat beads are consistent, build your knowledge gradually. Explore the advantages of stick welding in specific career paths, learn how to read fabrication blueprints to interpret alloy steel welding electrodes for specialized jobs, and research proper machine setup and equipment options as you upgrade.

It’s a feat few processes can claim, but SMAW remains one of the most widely used arc processes in maintenance, construction and pipeline work despite being one of the oldest. From a muddy pipeline right-of-way to a broken farm gate at midnight, there will always be a job where there isn’t access to a gas tank, shop power, or a pristine work environment. That self-reliant nature is exactly why you’ll still hear the crackle of a stinger on job sites today.

Frequently Asked Questions

What is shielded arc welding in simple terms?

It is arc welding in which the electrode’s flux coating burns in the heat of the arc and creates a protective envelope of gas and slag around the molten metal. That shield keeps oxygen and nitrogen in the air from contaminating the weld, which would otherwise cause porosity and weak, brittle joints.

Is shielded arc welding the same as stick welding?

In everyday use, yes. Shielded metal arc welding (SMAW) is the formal name for stick welding, and manual metal arc (MMA) is the European term. Older literature sometimes used ‘shielded arc welding’ more broadly for any process with arc protection, but today the phrase almost always means SMAW.

What does the ’60’ in E6010 or the ’70’ in E7018 mean?

It is the minimum tensile strength of the deposited weld metal in thousands of pounds per square inch. E6010 deposits metal with at least 60,000 psi tensile strength, and E7018 deposits at least 70,000 psi.

Can I stick weld with an AC-only machine?

Yes, but electrode choice matters. E6011, E6013 and E7018 are available in AC-capable versions, while E6010 is designed for DC electrode positive only. Check the electrode’s current type before you buy, because an AC-only machine will run a DC-only rod poorly or not at all.

Why does my stick weld keep sticking to the metal?

The usual causes are current set too low, an arc length that is too short at the start, a damp or damaged electrode, or a poor ground connection. Turn the amperage up slightly, strike like a match rather than tapping straight down, and clean the ground contact point.

Do I need shielding gas with a stick welder?

No. The shielding comes from the electrode coating, so there is no gas cylinder, regulator or hose. That is one reason stick welding is popular for field work and outdoor repairs where wind would blow away a gas shield.

Why is 7018 kept in a heated oven?

E7018 is a low-hydrogen electrode, and its coating absorbs moisture from the air once the sealed container is opened. Moisture introduces hydrogen into the weld, which can cause delayed cracking in high-strength or thick steel, so opened electrodes are held in a warming oven to keep them dry.

Is stick welding dangerous to breathe?

Welding fume from covered electrodes contains metal oxides, including manganese, and some electrodes add chromium or nickel. Short-term exposure causes irritation and metal fume symptoms, and repeated exposure carries serious risks, so use source extraction or good ventilation and wear a fitted respirator when controls are not adequate.

What is the best electrode for a beginner?

E6013 in 3/32 or 1/8 inch is the friendliest starting point because it restarts easily and runs on most machines. Once flat beads are consistent, move to E6010 for arc control practice and E7018 for structural-quality, low-hydrogen work.