Shielded Metal Arc Welding: The Complete Stick Welding Guide

It was 6:40 on a Saturday morning, the shop was cold, and a cracked trailer frame was blocking the only truck that could haul hay that day. The only machine on site was an old engine-driven stick welder, a box of 7018, and a chipping hammer — and that humble setup is exactly why shielded metal arc welding has refused to die for more than a century.

Why Shielded Metal Arc Welding Still Matters

That cracked trailer frame on a cold Saturday morning tells you almost everything you need to know about why this process survives. No gas cylinder, no spool gun, no laptop-driven settings screen — just a stinger, a ground clamp, and a rod that had been sitting in the toolbox since spring. The repair got made because shielded metal arc welding asks so little of the world around it.

So let’s answer the obvious question first.

Shielded metal arc welding (SMAW) is a manual arc welding process that joins metals by heating them with an electric arc struck between a flux-covered consumable electrode and the workpiece. The electrode’s core wire melts and becomes the filler metal. The extruded flux coating around it burns off to create a shielding gas envelope and a protective slag layer that keeps the molten weld pool away from the atmosphere. That’s the whole trick, and it has been working reliably for over a century.

You’ll hear it called stick welding in the shop and manual metal arc (MMA) welding in British, Australian, and pipeline documentation. Same process, different vocabulary. When a procedure specification lists “SMAW” and a foreman says “run a stick pass,” they mean identical things.

Why It Refuses to Be Replaced

Newer processes are faster, cleaner, and far easier to automate. Yet SMAW still shows up on structural steel erection crews, pipeline spreads, shipyards, plant maintenance rounds, and farm shops. The reasons are practical rather than sentimental:

• The equipment is simple and cheap. A basic constant-current machine and a set of leads will outlast several generations of inverter gadgets.
• It runs off generators. Engine-driven stick welders are standard on pipeline spreads and remote job sites where grid power is a rumor.
• It tolerates the outdoors. The flux coating generates its own shielding, so a breeze that would blow a MIG gas cloud apart barely registers.
• It handles imperfect metal. With the right electrode, you can weld through rust, mill scale, and mild contamination that would cause porosity in other processes.
• It reaches awkward places. One hand on the stinger, one hand steadying yourself, and you can weld a bracket in a corner no torch or gun could comfortably reach.

Those strengths are why the process is still written into welding procedure specifications across so much code work. If you want the longer case, our breakdown of the advantages of stick welding digs into the economics and field realities.

The consumables side is equally well organized. The American Welding Society publishes filler metal specifications that govern what’s actually inside the box, including AWS A5.1 for carbon steel covered electrodes and A5.5 for low-alloy steel electrodes. Those documents are why an E7018 bought in Ohio behaves the same as an E7018 bought in Osaka. You can read a plain-language summary of the classification system in Lincoln Electric’s AWS electrode classification guide.

Who This Guide Is For

This guide is written for people who need to actually do the work or evaluate it:

• Beginners who bought a used buzz box and want to stop making birdshit welds.
• Hobbyists and farmers repairing equipment where a technician is three weeks out.
• Maintenance techs who weld occasionally and need to get it right the first time.
• Career changers considering welding school or an apprenticeship.
• Inspectors and engineers who review procedures and need to know what the welder in front of them is actually fighting with.

No prior metallurgy is assumed. Where a term matters, it gets defined.

What’s Coming in This Guide

We’ll move in the same order a real job does. First, electrode selection — decoding the numbering system, comparing cellulose, rutile, and low-hydrogen coatings, and matching a rod to base metal condition and position. If you’re already shopping around, our all-position welding rod guide covers the practical shortlist.

Then power source behavior: AC versus DC, polarity, duty cycle, hot start, and arc force, with realistic amperage starting points for common electrode diameters. After that, technique — arc length, travel angle, stringers versus weaves, and multi-pass sequences for plate and pipe.

From there we get into where SMAW earns its keep, how it stacks up against MIG, TIG, and flux-cored, how to diagnose porosity, slag inclusion, undercut, and arc blow, and finally the safety ground rules. Those rules aren’t optional reading; the ventilation and fire prevention requirements in OSHA 29 CFR 1910.252 apply whether you’re in a shop or a barn.

One theme runs through all of it. Stick welding rewards fundamentals. The machine can only do so much; the rest is preparation, consistency, and knowing why a bead failed. That’s the mindset worth carrying into every section ahead.

What Is Shielded Metal Arc Welding? A Clear Definition and How the Arc Works

Shielded metal arc welding (SMAW) is an arc welding process in which an electric arc forms between a flux-covered, consumable metal electrode and the workpiece. The arc melts the electrode core, its coating, and the base metal. The core becomes the filler metal, while the coating breaks down to create the shield. No external gas cylinder, wire feeder, or applied pressure is needed. That simplicity is why most people simply call it stick welding, or manual metal arc welding outside North America.

The Circuit: From Power Source to Workpiece

Follow the circuit and the setup makes sense. The power source sends current through a welding cable to the electrode holder, often called the stinger. The electrode carries the current into the arc. From there, the current passes through the workpiece, the work clamp, and the return cable back to the machine. The electrode and workpiece are two halves of one live circuit, and the arc is the gap where the electrical energy becomes heat.

A stick welder is a constant-current (CC) power source. It may deliver AC or DC, depending on the electrode and the job. Open-circuit voltage is the voltage present before the arc starts, high enough to help current jump the gap. Once the arc is established, voltage drops to the arc voltage, typically much lower. The operator sets amperage at the machine, and that setting is the main heat control available at the stinger.

The Arc Sequence, Step by Step

The electrode touches the work, creating a brief short circuit. As the welder lifts it slightly, the current bridges the gap and the arc ignites. From that point, the process follows a predictable sequence:

1. Strike and establish the arc by touching, then lifting, the electrode.
2. Melt the electrode core and base metal with the concentrated heat of the arc.
3. Form a molten weld pool as the parent metal and filler combine.
4. Generate shielding gas as the flux coating vaporizes around the arc.
5. Create slag from the coating residue, which covers the cooling metal.
6. Solidify the weld while the gas and slag protect it from contamination.
7. Remove the slag with a chipping hammer and brush before the next pass.

What the Flux Coating Really Does

A common misconception is that the coating is merely a protective jacket for shipping. It is an engineered part of the process. The coating vaporizes to form a shielding gas and also produces slag that covers the cooling weld, protecting it from nitrogen, hydrogen, and oxygen in the air. Beyond that, coatings can add alloying elements and influence arc stability, penetration, deposition rate, and how easily the slag releases.

• Shielding: gas and slag exclude atmospheric contamination.
• Deoxidation: the coating helps remove oxygen from the weld metal.
• Alloying: selected elements can be added to the deposit.
• Arc stabilization: the coating helps maintain a steady arc, especially on AC.
• Slag formation: the residue insulates and protects the cooling bead.

The electrode is consumed, not just its coating. Every inch of rod becomes deposited metal, gas, and slag, which is why the stinger gets closer to the work as the weld progresses and why a short stub remains at the end.

Why Constant Current Matters at the Stinger

Arc voltage is governed largely by arc length, while amperage is set on the machine and is the practical measure of heat input the welder controls. A CC machine is designed to hold current relatively steady as the arc length changes. If your hand drifts upward, voltage rises and the arc gets longer, but the current does not run away. If you push the electrode closer, voltage falls. That behavior makes the process more forgiving of a human hand.

It also explains the feedback you hear and see. A long arc sounds hollow and sprays spatter; a short arc sounds crisp and focused. Neither changes the amperage setting much, but both change the weld. Set the current for the joint and thickness, then use arc length and travel speed to fine-tune the result. The machine sets the ceiling; the welder controls the arc.

Reading a Stick Electrode: Flux Coatings and the AWS Classification System

A box of stick electrodes can look like a row of identical gray rods, but the printed code on each one is closer to a compressed datasheet. Learn to read it and you can predict penetration, position capability, current type, and hydrogen risk before you strike an arc. That matters whether you are repairing a trailer in a driveway or welding to a qualified procedure on a structural job.

How to Decode an E6010 or E7018

Every AWS classification begins with E for electrode. Read the rest from left to right, using the AWS classification system as your reference:

• Tensile strength: the first two digits give minimum tensile strength in ksi. A 60-series electrode deposits at least 60,000 psi; a 70-series at least 70,000 psi.
• Position: the next-to-last digit indicates welding position. A “1” means all position, “2” means flat and horizontal fillets, and “3” means flat only.
• Coating and current: the final digit identifies the coating family and the current the electrode is designed to run on.

On E7018, that reads as 70 ksi minimum tensile strength, all-position capability, and a low-hydrogen iron-powder coating. On E6010, it means 60 ksi, all position, and a high-cellulose sodium coating designed for direct-current electrode positive (DCEP). Once you know the pattern, the code tells you most of what the rod wants to do.

Classification	Tensile (ksi)	Position	Coating / Current	Typical Use
E6010	60	All	High cellulose, sodium / DCEP	Pipe roots, deep penetration
E6011	60	All	High cellulose, potassium / AC or DC	Maintenance, dirty or rusty steel
E6013	60	All	Rutile / AC or DC	Sheet metal, general fabrication
E7014	70	All	Rutile plus iron powder / AC or DC	Higher deposition, general work
E7018	70	All	Low hydrogen, iron powder / AC or DCEP	Structural, pressure, low-temperature work
E7024	70	Flat and horizontal fillets	Heavy iron powder, rutile / AC or DCEP	High-deposition flat welding

What the Coating Codes Actually Mean

The coating is not decoration. It controls arc stability, shielding, slag, and how the metal freezes. The main families behave very differently:

• Cellulosic: roughly 30% of the coating weight comes from organic material, which produces carbon monoxide and hydrogen in the arc. E6010 and E6011 burn with a forceful, fast-freezing arc, dig deep, and leave a thin, friable slag. The tradeoff is hydrogen pickup, which raises cracking risk on susceptible steels.
• Rutile: titania-rich coatings such as E6013 produce a softer arc, easy restarts, and a heavier slag that protects the bead. Penetration is moderate, which suits thin material and less-than-perfect fit-up.
• Low hydrogen: E7018 uses a basic coating that keeps diffusible hydrogen low. It produces a smooth arc and a denser slag, but the coating must be stored dry. Damp 7018 is a cracking risk, not a convenience.
• Iron powder: added iron powder raises deposition efficiency and slag volume. E7024 is the classic example: fast in the flat position, but not an all-position rod.

For a deeper comparison of how these coatings perform in practice, this electrode classification breakdown is useful. Just remember that the box code describes the family, not every brand-specific quirk.

H, R, and -1 Suffixes

Hydrogen designators appear as H4, H8, or H16. The number is the maximum diffusible hydrogen in milliliters per 100 grams of deposited weld metal. H4 means no more than 4 mL/100 g, H8 means 8, and H16 means 16. Lower is generally better for crack resistance, which is why low-hydrogen electrodes are specified carefully on restrained joints and higher-strength steels. The R suffix means the coating is moisture resistant, while -1 indicates improved toughness, as in E7018-1. Neither suffix excuses poor storage. An R coating resists pickup; it does not make a wet rod acceptable.

Stainless electrodes follow AWS A5.4, with designations such as E308L-16, and cast iron repairs fall under AWS A5.15. Those systems carry different suffixes and should not be decoded as if they were carbon-steel rods.

Choosing an Electrode by Job, Position, and Code

Start with the base metal and its condition. Clean, properly fitted carbon steel is a natural home for E7018. Dirty, rusty, or poorly fitted steel often favors E6011 because it tolerates contamination and runs on AC or DC. Thin sheet and shaky fit-up suit E6013. Flat production work can use E7024 for speed. For position work, check the position digit and confirm the rod is genuinely rated for vertical and overhead use; our all-position welding rod guide covers that in more detail.

Strength matching is only the beginning. Restrained joints, thick sections, low-temperature service, and higher-strength steels may require a specific low-hydrogen classification and H level. Alloy steels add another layer, since matching tensile strength does not guarantee matching composition or toughness; see this guide to alloy steel welding electrodes before substituting. On code work, the welding procedure specification is the final authority. It may name the electrode, brand, H designation, current, and storage requirements.

Power Sources, Polarity, and Amperage Settings That Actually Work

You can have clean metal, a fresh box of electrodes, and textbook technique and still lay a bead that looks like a caterpillar having a bad day. Most of the time, the machine settings are the culprit. Stick welding is unforgiving about power: the arc either has enough energy to fuse properly or it doesn’t, and no amount of wrist work fixes a bad setup. Here are the settings that actually matter.

AC vs. DC: Two Very Different Arcs

Stick welders come in two electrical flavors. Alternating current (AC) reverses direction many times per second, typically 60 cycles in North America, while direct current (DC) flows one way.

AC machines are simpler, cheaper, and famously forgiving of arc blow. The downside is that current crosses zero on every cycle, so the arc briefly extinguishes and reignites dozens of times a second. That hurts arc stability, and not every electrode tolerates it. Cellulose rods like E6010 are built for DC and run poorly on AC. E6011 is the AC-friendly version of the same idea.

DC machines cost more but give you a smoother, more controllable arc, plus a choice of polarity that changes how the weld behaves.

DCEP vs. DCEN: What Polarity Actually Changes

On direct current, the electrode can be positive or negative. This isn’t a minor detail, because it shifts where the heat lands.

• DCEP (electrode positive) puts about two-thirds of the arc’s heat into the workpiece. Electron bombardment creates deeper penetration and a wider fusion profile, which is why it’s the recommended polarity for many electrodes, especially on thick sections where the arc needs to dig.
• DCEN (electrode negative) flips that balance. More energy melts the electrode, less reaches the plate. Penetration gets shallower, deposition rises slightly, and burn-through risk drops, making it a practical choice for thin sheet, open-root work, and surfacing.

When in doubt, read the data sheet. Polarity is a specification, not a preference. Running E7018 on the wrong polarity gives you a sputtering arc and a weld that fails inspection. The ESAB guide to polarity in stick welding is a solid plain-language reference.

Why AC Helps With Arc Blow and Long Leads

Arc blow is the tendency of the arc to wander sideways or backward, driven by magnetic fields the welding current generates. It worsens with DC, high amperage, and work near the ends of a joint where the field has nowhere to go.

AC reduces it because current reverses continuously; those reversals and the induced eddy currents they create weaken the steady fields that deflect the arc. If you’re fighting blow on DC and can’t move your work lead, switching to AC is often the fastest fix. AC also holds up better on long cable runs, where voltage drop on DC leaves a weak, stuttering arc at the stinger. The Lincoln Electric guidance on preventing arc blow covers the full list of remedies.

Duty Cycle: The Number Buyers Ignore

Duty cycle is the number of minutes in a 10-minute period a machine can run at a given output without overheating. A 60 percent duty cycle at 130 amps means six minutes welding, four minutes cooling, repeated.

The catch is that duty cycle is rated at a specific amperage. A small 120-volt machine might claim 90 amps at 20 percent duty cycle, which is two minutes of welding out of every ten. Crank it to 130 amps and it collapses further. If your work means long, continuous beads, buy a machine whose rated duty cycle at your real working amperage leaves room to breathe. Ignoring this is how hobbyists end up with thermal shutdowns halfway through a trailer repair.

Open-Circuit Voltage, Arc Force, and Hot Start

Open-circuit voltage (OCV) is the voltage at the stinger with no arc established. It must be high enough to strike and hold an arc but low enough to be safe; OSHA caps it at 80 volts for most manual arc welding under normal conditions. You’ll find the specifics in 29 CFR 1910.252.

Two features make life easier:

• Hot start briefly boosts current as you strike, helping the electrode establish an arc without sticking. It’s a lifesaver on cold mornings and on older machines with low OCV.
• Arc force (or “dig”) adds current automatically as the arc shortens. More dig lets you push the electrode into the joint without sticking, which helps on root passes and tight fit-ups. Less dig gives a softer arc for capping.

Amperage: Where to Start

Amperage is the dial you’ll adjust most. Too low and the arc stutters, the bead sits high and cold, and you get lack of fusion. Too high and you’ll undercut, spatter, and burn through thin sections.

Start with the manufacturer’s range, then fine-tune. A 1/8 in. E6010 typically runs well from 75 to 125 amps, while a 5/32 in. E7018 may run up to about 220 amps.

Electrode Diameter	Typical Amperage Range	Common Use
3/32 in. (2.4 mm)	60–100 A	Thin plate, root passes, vertical up
1/8 in. (3.2 mm)	75–140 A	General fabrication, most repair work
5/32 in. (4.0 mm)	110–190 A	Heavy plate, flat and horizontal
3/16 in. (4.8 mm)	150–240 A	Thick sections, high deposition

One rule worth memorizing: vertical and overhead work generally needs roughly 15 percent less current than flat work. Gravity pulls the pool down and out of the joint when you weld uphill or upside down, so a cooler arc keeps you in control. Run 120 amps on flat plate and start around 100 to 105 for the vertical pass.

The same logic crosses process lines, since deposition rate, penetration, and heat input all hinge on power settings, which is why our advantages of stick welding breakdown keeps returning to machine setup. If you’re adding a second process for thinner work, our all position welding rod guide covers how electrode choice and current interact out of position.

Get polarity right, set amperage from the data sheet, respect duty cycle, and let hot start and arc force do their jobs. Do that, and the machine stops fighting you. Then the only variable left is your hand.

Stick Welding Technique: Arc Length, Travel Angle, and Multi-Pass Joints

Stick welding rewards preparation more than raw hand speed. A beautiful bead starts with a clean joint, a sensible fit-up, and an electrode angle you can hold consistently. Get those basics right and the arc does most of the work.

Preparation, Fit-Up, and Tacking

Before you strike an arc, grind or wire-brush the joint down to bare metal. Mill scale, rust, oil, paint, and galvanizing all interfere with the arc and can end up trapped in the weld. Remove at least an inch back from the joint faces and the surrounding surfaces.

• Check that the parts align and the gap is consistent along the joint.
• Clean the back side too, especially on a root pass.
• Use strong, properly sized tacks made with the same electrode you plan to weld with.
• Feather or blend tack ends so the root pass ties in smoothly.

Good fit-up means less fighting the arc and fewer defects. A tight gap can cause lack of penetration; an excessive gap invites burn-through and a messy root.

Electrode Angle, Travel Angle, and Arc Length

For a fillet weld, the work angle generally bisects the joint at about 45 degrees, while the electrode leans into the direction of travel. Most stick welding uses a drag, or backhand, travel angle of roughly 10 to 15 degrees. This keeps the arc force pushing molten metal and slag backward, away from the leading edge of the puddle.

Drag is the default for stick because it improves shielding and keeps slag behind the arc. Pushing can give a clearer view in some positions, but it raises the risk of slag entrapment and poor fusion.

Arc length matters just as much as angle. As a rule, hold an arc about 1/16 in. long with 1/16 and 3/32 in. electrodes, and about 1/8 in. with 1/8 and 5/32 in. electrodes. That is roughly the electrode core diameter, not the outside of the flux coating.

A short arc with the right amperage produces a sharp, crackling sound, often compared to frying bacon. A long arc sounds softer and erratic, throws excess spatter, reduces deposition, and can cause undercut or porosity. Watch the puddle: it should stay fluid and tied into both edges of the joint.

Stringer Beads vs. Weaves

A stringer is a straight bead with little or no side-to-side motion. It concentrates heat, gives good penetration, and works well for roots, fill passes, and vertical-up work. A weave moves the electrode across the joint in a controlled pattern, such as a slight Z or J, to cover more width and shape the cap.

Weaves are useful for wider joints and appearance, but they increase heat input. Keep them controlled, and never use a wide weave to hide poor fit-up. On code work, follow the procedure specification and the electrode maker’s recommendations.

Multi-Pass Pipe and Plate Sequences

On carbon steel pipe, a common sequence is root, hot pass, fill, and cap. Cellulosic electrodes such as E6010 or E6011 are widely used for the root because they penetrate well and freeze quickly. E7018 low-hydrogen electrodes are then typical for fill and cap passes. AWS D10.12M/D10.12, the recommended practice for mild steel pipe welding, covers downhill and uphill root techniques with E6010 as well as E7018 fill and cap procedures. You can review the scope through the AWS D10.12 pipe welding standard.

1. Root: Establish complete fusion at the joint faces without burning through.
2. Hot pass: Refine the root, burn out minor imperfections, and add thickness quickly.
3. Fill: Build the joint evenly without exceeding the cap height.
4. Cap: Produce a uniform surface with proper reinforcement and no undercut.

On plate, the same logic applies. Use stringers or controlled weaves to fill the joint evenly, and alternate sides where distortion is a concern. If you need a refresher on electrode choices for vertical and overhead work, this all-position welding rod guide explains the common options.

Slag Removal Is Not Optional

Every pass must be chipped and brushed clean before the next bead goes down. Slag trapped between passes causes slag inclusion and lack of fusion, two defects that are easy to create and expensive to repair. Use a chipping hammer to break the slag, then a wire brush to remove the dust and loose particles. Look closely at the edges of the bead for any glassy pockets.

Beginner Drills That Build Real Control

Practice deliberately rather than burning rod after rod without a goal.

• Pad beads: Run straight beads on a flat plate, overlapping each by about half. Aim for consistent width, height, and spacing.
• T-joints: Practice 45-degree work angles and equal leg lengths. Inspect for undercut and slag at the toes.
• Lap joints: Focus on melting both the top edge and the bottom plate without burning through the thinner section.

Stick welding is a fundamentals-first process. The same patience that made that early-morning trailer repair possible is what makes consistent, code-quality welds later. It is also a big part of why stick welding still earns its place on jobsites today.

Where SMAW Earns Its Keep: Real Applications and Jobsite Scenarios

Walk onto almost any structural steel site, pipeline spread, or shipyard and you will still hear the distinctive crackle of a stick welder. That is not nostalgia. It is a process being chosen, job after job, because it solves problems that gas-shielded processes struggle with. Once you understand where SMAW fits, electrode selection and machine settings stop being abstract theory and become practical decisions.

Let us look at the settings where stick welding is still the first name on the list.

Structural Steel Fabrication and Erection

Steel erection is SMAW’s home turf. Columns, beams, bracing, and moment connections are often welded in the field with low-hydrogen E7018, specified for its toughness and resistance to hydrogen-assisted cracking. That is not a preference; it is usually written into the job. A qualified welding procedure will name the electrode classification, the current range, and the preheat, and the welder follows it.

Why stick? Because connections areoften in positions a wire feeder cannot easily reach, and because a single machine with a handful of electrodes covers root, fill, and cap without gas cylinders or a wire drive. E7018, a low-hydrogen electrode, is one of the most widely used consumables across power generation, shipbuilding, pressure vessel, and pipeline work for exactly that reason.

Pipeline and Process Piping

On cross-country pipeline spreads, SMAW is still specified for root passes because cellulosic electrodes such as E6010 produce deep penetration and a fast-freezing bead that holds its shape in a vertical-down root. Fill and cap frequently move to E7018 or a mechanized process, but the root remains a stick job more often than not. Process piping in refineries and chemical plants follows the same logic, with the electrode and technique dictated by a qualified procedure rather than by what is in the rod oven.

Shipbuilding, Repair, and Heavy Equipment

Shipyards and barge repair docks work in wet, windy, awkward spaces where dragging a gas hose is impractical. Agricultural and heavy equipment repair is the same story: cracked loader arms, worn bucket edges, and broken hitch plates are usually dirty, painted, or greasy, and a cellulosic or rutile electrode will arc through more contamination than MIG will tolerate. For odd-position work on a machine that cannot be moved, an all-position welding rod guide is worth keeping on the truck.

Plant Maintenance, Code Work, and Fabrication

Turnarounds, boiler repairs, and pressure vessel work fall under code rules. Structural steel is governed by AWS D1.1, pressure equipment by ASME Section IX and related codes, and both require a qualified welding procedure specification plus welders qualified to it. Inspectors will ask for those documents before they ask about your bead appearance.

Why Stick Wins Outdoors

The flux coating generates its own shielding gas and slag, so stick welding is far less affected by wind than gas-shielded processes such as GMAW. That single fact explains a huge share of its field use, along with generator-friendly power draw and tolerance for mill scale and light rust.

Three Jobs, Three Decisions

Scenario	Typical Choice	Reason
Pipeline root pass	E6010, vertical down	Deep penetration, fast-freezing bead
Farm repair on dirty steel	E6011 or E6013	Arcs through rust and paint, runs on generator power
Structural column splice	E7018, low hydrogen	Toughness and hydrogen cracking resistance

The pattern is consistent: match the electrode to the metal condition, the position, and the code, then confirm against manufacturer guidance on low-hydrogen electrodes. Safety obligations travel with all of it under OSHA 29 CFR 1910.252. If you want the short version of why this process endures, our breakdown of the advantages of stick welding covers it.

Benefits and Limitations of Stick Welding Compared With MIG, TIG, and Flux-Cored

The best welding process isn’t the most advanced one, it’s the one that fits the job. For the shielded metal arc welding (SMAW) process, that job is almost always one with poor access, dirty steel, or weather that would make other processes impossible.

Where Stick Welding Wins

The biggest strength of stick welding is its independence. With nothing more than a power source, cables, a holder, and electrodes, there’s no external shielding gas cylinder to haul, rent, or run out of. For service trucks, remote jobs, or engine-driven welders with no utility power, that simplicity is invaluable.

This independence carries over to the outdoors. The flux coating on a stick electrode creates its own shielding gas at the arc, allowing it to hold up against wind that would strip the gas envelope from GMAW. Paired with its tolerance for rust, mill scale, or light paint, stick welding thrives where clean, controlled shop conditions aren’t an option.

• Low cost to start: A capable stick machine is far cheaper than a comparable multi-process setup.
• True portability: Engine-driven units can go anywhere a truck can.
• Versatile electrodes: From E6010 for penetration to low-hydrogen E7018 for code work, there’s an electrode for most carbon steel repairs.
• Field ready: Ideal for odd positions and tight, obstructed joints.

Where Stick Welding Falls Short

All of that toughness comes at the cost of speed and cleanliness. Every weld produces slag that must be chipped and brushed before the next pass, adding labor to every joint. On top of this, electrodes are only used down to a stub, forcing constant stops to change them. These factors drastically cut operator efficiency compared to continuous wire processes.

Additional drawbacks include spatter, a heightened risk of burn-through on thin sheet metal, and a steeper learning curve for arc length control. Simply put, stick welding leaves very little room for error from the operator.

Head-to-Head Comparison

Compared to GMAW, or MIG, stick loses on deposition rate and bead appearance. MIG can feed wire continuously with no slag, making it perfect for production. However, it is highly susceptible to drafts, and dislikes contaminated metal far more than stick. Those considering wire feed for outdoor work should review practical MIG considerations before doing so.

GTAW, or TIG, sits at the opposite end of the spectrum. Its precision is unmatched for thin material and stainless steel, but it requires two hands, foot control, and immense coordination. For thick carbon steel, its speed makes it rarely economical when compared to stick or flux-cored.

Flux-cored arc welding (FCAW) is the closest competitor to stick in the field. Self-shielded FCAW can shrug off wind much like SMAW whilst feeding continuously for much higher deposition. The tradeoff, however, is heavy fume generation and still having to remove slag between passes.

Factor	SMAW (Stick)	GMAW (MIG)	GTAW (TIG)	FCAW
Deposition rate	Low to moderate	Moderate to high	Low	High
Portability	Excellent	Fair (gas cylinder)	Fair (gas cylinder)	Good
Wind tolerance	Excellent	Poor	Poor	Good to excellent
Cleanliness	Slag and spatter	Clean, no slag	Cleanest	Slag and fume
Skill curve	Moderate to steep	Easiest	Steepest	Moderate
Best fit	Repair, structural, pipe roots, field work	Production, sheet, light fabrication	Thin metal, stainless, critical roots	Heavy fabrication, outdoor production

The Bottom Line

Stick welding trades speed for resilience. For repetitive bench work, MIG or FCAW will almost always be cheaper in labor. For a one-off repair in the mud with high winds and rusty steel, no contest: stick is the sensible choice.

Troubleshooting Stick Welding Defects: Porosity, Slag Inclusion, Undercut, and Arc Blow

Every stick welding defect is evidence. The bead is telling you something about arc length, current, travel speed, cleanliness, or the electrode itself. The welders who improve fastest are the ones who diagnose each pass instead of discovering a cluster of problems after the part is finished. The advantages of stick welding are real, but they come with a diagnostic tax: the process punishes poor fundamentals visibly.

Porosity and Wormhole Porosity

Porosity appears as rounded gas pockets on the bead surface or inside the weld after grinding. Wormhole porosity is more serious: elongated, pipe-like voids that can run deep into the deposit. The usual suspects are an arc that is too long, dirty workpiece surfaces, and damp electrodes. Paint, oil, mill scale, rust, and moisture all turn into gas when the arc hits them.

Wormholes are strongly associated with moisture pickup in low-hydrogen electrodes. A damp E7018 can look fine and still deposit hydrogen-rich metal. That is why storage and reconditioning of low-hydrogen electrodes matter so much. Keep the arc tight, clean the joint, and follow the electrode manufacturer’s storage instructions.

Slag Inclusion

Slag inclusion looks like dark, glassy pockets or thin lines of trapped slag between passes. The cause is usually simple: the previous pass was not cleaned properly, or the welder ran over loose slag and froze it into the next layer. A steep travel angle, a weaving technique that folds slag into the pool, and poor access at the joint root can also trap it.

Chip and brush every pass, including the root. Do not rely on a quick pass with a wire brush alone. If slag is stubborn, use a chipping hammer and a grinder where the procedure allows. Adjust your angle so the arc pushes slag ahead of the pool rather than rolling over it.

Incomplete Fusion and Lack of Penetration

Incomplete fusion means the weld metal did not bond to the sidewall or to the previous pass. It often hides under a bead that looks acceptable from the surface. Lack of penetration is a root problem: the arc never melted the full joint depth. Both are structural defects, not cosmetic ones.

Common causes include current that is too low, travel speed that is too fast, a long arc, poor joint fit-up, and an electrode angle that directs heat away from the root. Correct the setup before you correct the hand. Confirm the amperage range, tighten your arc length, and make sure the root gap and land are suitable for the procedure.

Undercut, Excessive Spatter, and Burn-Through

Undercut is a groove melted into the base metal along the toe of the weld that the filler never filled. It usually points to current that is too high, an arc that is too long, or travel that is too fast. Excessive spatter is often traced to amperage that is too high for the electrode or an arc length that is too long. Burn-through is the opposite extreme: too much heat, too slow a travel speed, thin material, or a root gap that is too wide.

Fix undercut by reducing current slightly, shortening the arc, and pausing at the toes without dwelling long enough to create a hump. Fix spatter by matching the electrode to its recommended current range and keeping a consistent arc. Fix burn-through by lowering current, increasing travel speed, and improving fit-up.

Cracking and Hydrogen-Assisted Cracking

Cracks may appear as crater cracks, longitudinal cracks along the bead, or transverse cracks across the weld. High restraint, a concave bead profile, a deep crater, and rapid cooling all contribute. Hydrogen-assisted cracking is the one to respect most. Risk rises with moisture pickup in low-hydrogen electrodes, which is why storage and reconditioning are part of the welding procedure, not optional housekeeping.

Follow the qualified procedure for preheat, interpass temperature, and electrode handling. Never

Stick Welding Safety: Fume, Ventilation, Fire, and Personal Protection

Stick welding punishes shortcuts, and the consequences are not limited to a bad bead. The process throws sparks, produces dense fume, and leaves hot slag that can start a fire long after the arc stops. Most of the rules below are not suggestions. They come from OSHA 29 CFR 1910.252, and they exist because welders have been hurt in predictable ways.

Fume Is the Hazard You Cannot See

Welding fume is a complex mixture of metal oxides and gases produced when the electrode, flux, and base metal vaporize and condense. The particles are fine enough to reach deep into the lungs. According to OSHA, prolonged exposure to welding fume can cause lung damage and cancers of the lung, larynx, and urinary tract.

Three exposures deserve special attention:

• Hexavalent chromium. Stainless steel electrodes contain chromium, and the arc can generate Cr(VI), a known carcinogen. Stainless work needs local exhaust and often a respirator.
• Manganese. Common in carbon steel electrodes, manganese fume is linked to neurological effects that resemble Parkinsonism.
• Metal fume fever. Welding galvanized steel releases zinc oxide fume, which can cause flu-like symptoms. It usually passes, but that does not make it harmless.

Electrode selection and fume control go hand in hand, especially with alloy and stainless consumables. Our guide to alloy steel welding electrodes covers those selection and safety trade-offs in more detail.

Confined spaces add another layer of danger. Welding can consume oxygen and accumulate fume in a tank, pit, or vessel, creating an oxygen-deficient or toxic atmosphere. Test the air before entry and monitor it continuously. Never trust your nose to warn you, because carbon monoxide and oxygen deficiency have no smell at all.

Ventilation: What OSHA Actually Requires

Fume controls start with ventilation. OSHA requires mechanical ventilation when welding occurs in a space of less than 10,000 cubic feet per welder, where the ceiling height is under 16 feet, or where cross ventilation is obstructed.

Where mechanical ventilation is required, the minimum general rate is 2,000 cubic feet per minute per welder unless local exhaust or airline respirators are used. Local exhaust hoods must maintain a capture velocity of 100 linear feet per minute in the welding zone. That means positioning the hood close to the arc, not across the shop. A hood two feet away pulls almost nothing from the plume.

Fire Prevention Starts Before the Arc

Move combustible materials at least 35 feet from the work. If they cannot be moved, protect them with fire-resistant guards. Sparks and slag travel farther than most people expect, and they can fall through cracks, floor drains, or gaps in a wall into hidden spaces you never checked.

Use a hot work permit where required, assign a fire watcher when conditions demand it, and continue the fire watch for at least 30 minutes after welding ends. That final check is not busywork. Smoldering material can sit quietly and ignite long after the welder has packed up. Keep a charged extinguisher within reach, and know that water is the wrong choice on live electrical equipment.

PPE That Belongs on Every Job

Your helmet protects more than your eyes. Choose a shade dark enough to stop arc flash but light enough to see the puddle and joint. Most stick work falls in the shade 9 to 11 range; start around shade 10 and adjust. Wear safety glasses under the helmet for grinding and chipping, and use a face shield when appropriate.

• Leathers: a jacket or sleeves, apron, and boot guards to block sparks and UV.
• Gloves: welder’s gauntlets, with the cuff over the sleeve so sparks cannot drop inside.
• Respirators: required when engineering controls are not enough. Use them only under a written respiratory protection program with fit testing and medical evaluation.
• Hearing protection: chipping, grinding, and engine-driven machines can exceed safe noise levels.

Safety is a system, not a piece of equipment. The fume controls, fire watch, and PPE have to work together. A dark lens does not compensate for poor ventilation, and a respirator does not excuse welding over a pile of cardboard.

Common Mistakes, Practical Tips, and a Realistic Path Forward

Almost every defect we have talked about in this guide traces back to a habit rather than a mystery. Porosity, slag traps, arc blow, undercut, and beads that look like a strip of bacon all tend to come from the same short list of errors. Fix the habits and the welds improve faster than any machine upgrade will manage.

The Mistakes That Cost You the Most

1. Running too long an arc. The puddle spreads, the arc wanders, spatter flies, and the flux shield gets thin. Keep arc length close to the electrode core diameter and let the coating do its job.
2. Skipping slag removal between passes. Slag left on a hot bead gets trapped under the next one. Chip, brush, and inspect before you strike again.
3. Using damp 7018. Low-hydrogen electrodes should live in a sealed container or a holding oven, and any that have been exposed to moisture need reconditioning per the manufacturer’s instructions. Damp electrodes are a direct route to wormhole porosity and hydrogen cracking, which is why low-hydrogen storage rules matter as much as technique.
4. Choosing the wrong polarity. Many electrodes are designed for DCEP. Running them on the wrong current type or polarity changes penetration, arc stability, and bead shape, and some simply will not run well at all.
5. Guessing at amperage. Start from the manufacturer’s range for the diameter, then adjust for position, joint thickness, and fit-up. Write down what worked so you can repeat it.
6. Welding over paint, plating, or galvanizing. These coatings can generate hazardous fume, so clean the surface first or handle the work with proper controls and respiratory protection, as outlined in OSHA 29 CFR 1910.252.
7. Ignoring duty cycle. Ratings are tied to a specific amperage and voltage, so a machine rated 200 amps at 25 percent duty cycle cannot run continuously at that output without overheating.
8. Not reading the procedure. On code work the procedure is the plan, not a suggestion. Guessing at variables invalidates the work you just did.

Tips That Pay Off Immediately

• Watch the puddle, not the arc. The puddle tells you about travel speed, heat, and fusion.
• Keep a 10 to 15 degree drag angle and a steady travel speed rather than a jerky one.
• Grind to bright metal at every restart and at every tack.
• Keep stinger connections tight and work leads short and untangled; a poor ground causes more weird arcs than a bad machine.
• Blow dust out of the machine regularly and respect cool-down periods. Clean power tools outlive abused ones.
• Match the electrode to the job. The all position welding rod guide is a good refresher when you are choosing between a fast-freeze root rod and a smooth-running fill rod.

Practice Structure, Training, and Two Kinds of Qualification

Practice with a purpose. Run pad beads until the ripple pattern is even, then move to T-joints and lap joints, changing one variable per session: amperage, then arc length, then travel speed. Twenty focused minutes beats two hours of random striking.

Formal training helps enormously. Community college programs, union apprenticeships, and in-house training all teach the muscle memory that self-teaching struggles to build. Along the way you will meet two different ideas that beginners often confuse. A welder qualification tests a person’s ability to produce a sound weld to a specific standard, while a procedure qualification tests whether a written welding procedure can produce acceptable results. A welding procedure specification is the document that captures those tested variables: process, electrode classification and diameter, current type and range, position, preheat, and cleaning method.

Buying Your First Stick Welder

For a first machine, a 200-amp-class AC/DC inverter covers most hobby and repair work in a compact package, while a transformer machine costs less but weighs more and often runs AC only. DC lets you run 7018 properly; AC-only limits you mostly to 6011 and 6013. Check the duty cycle at the amperage you will actually use, not the headline number. Stick welding remains one of the cheapest ways into real structural work, which is why its advantages still hold up against newer processes.

Back to That Trailer Frame

Remember the cold Saturday morning, the engine-driven machine, and the box of 7018? Nothing about that repair depended on a fancy feature or the newest technology. It depended on clean metal, dry electrodes, the right polarity, sensible amperage, a short arc, and slag chipped off between passes. Shielded metal arc welding rewards fundamentals over gadgetry, and the welders who get consistently good results are the ones who keep returning to those basics.

Frequently Asked Questions

What does SMAW stand for and is it the same as stick welding?

SMAW stands for shielded metal arc welding. It is the same process commonly called stick welding, and in much of the world it is known as manual metal arc welding or MMA. The name refers to the flux coating on the consumable electrode, which shields the molten weld from the atmosphere.

Is stick welding harder than MIG welding?

Most people find stick welding harder to learn at first because the welder must maintain arc length manually while the electrode shortens. MIG welding is easier to start with, but stick welding gives excellent penetration and portability once the fundamentals are mastered. Neither is inherently better; the job and the procedure decide.

Can I stick weld with a 120-volt machine?

Yes, small 120-volt inverter stick welders exist and can handle light repair work and thin to medium steel. They are limited in amperage and duty cycle, so they struggle with large electrodes and thick sections. Check the duty cycle at the amperage you actually plan to use, not just the maximum rating.

Why does my 7018 electrode keep sticking to the plate?

Sticking usually means the amperage is too low for the electrode diameter, the arc was struck with too much pressure, or the electrode is damp. Try a slightly higher current within the manufacturer’s range, strike with a light scratching motion, and use properly stored electrodes.

What causes porosity in stick welds?

Porosity comes from gas trapped in the solidifying weld metal. Common causes include an arc that is too long, oil, paint, rust, or moisture on the base metal, damp electrodes, and inadequate shielding at the start of a bead. Cleaning the joint and using dry electrodes solves most cases.

Do I need to remove slag between passes?

Yes. Slag trapped between passes causes slag inclusion and lack of fusion, both of which are serious discontinuities. Chip and brush each pass, inspect it, and only then start the next bead. On code work, failure to clean between passes can be grounds for rejection.

What polarity should I use for stick welding?

Use the polarity specified for the electrode. E6010 requires DCEP, E6011 runs on AC or DC, and E7018 typically runs best on DCEP though many classifications allow AC. The electrode packaging and manufacturer datasheet are the authority, and using the wrong polarity can ruin arc stability and bead quality.

Is stick welding safe indoors?

It can be, but only with proper ventilation and fire precautions. OSHA requires mechanical ventilation in small or low-ceiling spaces and sets minimum airflow rates. Use local exhaust or general ventilation, keep combustibles at least 35 feet away, and wear appropriate respiratory protection when exposure cannot be controlled.

How thick can stick welding penetrate?

There is no simple thickness limit because penetration depends on electrode type, amperage, joint design, and technique. A deeply penetrating cellulosic electrode can fuse a substantial root, while low-hydrogen electrodes favor controlled fill and cap passes. Thick sections are usually welded with multiple passes and may require preheat per the procedure.