What Is Shielded Metal Arc Welding (SMAW)? A Complete Beginner’s Guide to Stick Welding

A contractor’s backhoe snapped its bucket arm two hours from the nearest shop, with a storm moving in and no generator-powered MIG rig in sight. One old stick welder, a handful of 7018 rods, and a truck battery charger later, the machine was working again. That stubborn, go-anywhere reliability is exactly why shielded metal arc welding is still the first process taught in welding schools and the last one a professional gives up.

What Is Shielded Metal Arc Welding? A Plain-English Definition

A contractor’s backhoe snapped its bucket arm two hours from the nearest shop, with a storm moving in and no generator-powered MIG rig in sight. One old stick welder, a handful of 7018 rods, and a truck battery charger later, the machine was working again. That stubborn, go-anywhere reliability is exactly why shielded metal arc welding is still the first process taught in welding schools and the last one a professional gives up.

If you typed “what is shielded metal arc welding” into a search box, you want a straight answer rather than a wall of jargon. Here it is.

SMAW in One Sentence

Shielded metal arc welding (SMAW) is a manual arc welding process that uses a consumable, flux-coated electrode to strike an electric arc against the workpiece. The arc melts both the base metal and the tip of the electrode, and that molten filler metal builds the weld bead while the coating protects it from the atmosphere.

The American Welding Society calls SMAW the most widely known of the arc welding processes, describing it as a basic, versatile process for joining ferrous and some nonferrous metals. That framing comes from the AWS Welding Handbook, which has been the reference document for the welding industry for decades. In plain terms: if you need to join two pieces of steel and you can plug in a machine (or start a generator), SMAW will probably do it.

The Other Names It Goes By

One process, several labels, and they all mean the same thing:

• Stick welding and simply stick — the informal shop term, because the electrode looks like a stick.
• Manual metal arc (MMA or MMAW) — the common term outside North America.
• Shielded metal arc welding (SMAW) — the AWS technical name and the official process classification.
• Flux-shielded arc welding or covered electrode welding — older terms you will still see on legacy drawings and procedure sheets.

What the Flux Coating Actually Does

The electrode is the heart of the process. It has two parts: a solid metal core wire, which becomes the filler metal, and a flux coating, which does the chemistry. When the arc heats the rod tip, the coating decomposes and accomplishes three jobs at once:

1. It shields. The decomposition produces a blanket of shielding gas around the arc, keeping oxygen and nitrogen from reacting with the molten puddle.
2. It protects. The same coating forms a liquid slag that floats over the molten weld pool and solidifies into a crust, shielding the hot metal as it cools.
3. It stabilizes and refines. Arc-stabilizing minerals keep the arc smooth, while alloying elements in the flux can add deoxidizers or deposit desired chemistry into the weld bead.

Once the weld solidifies, you chip the slag and brush the bead clean, then snap off the consumed stub and load a fresh rod. That cycle is the whole process in miniature.

Where SMAW Fits in the Arc Welding Family

Arc welding is the broad family in which heat comes from an electric arc between an electrode and the work. SMAW sits alongside gas tungsten arc welding (TIG), gas metal arc welding (MIG), flux-cored arc welding, and submerged arc welding. All of them melt metal with an arc; what separates them is how they shield the puddle and how they deliver filler.

SMAW is unusual because it carries everything in one consumable stick. There is no separate shielding gas cylinder, no wire feeder, and no torch liner. That is why a basic rig needs only an electrode holder, a work clamp, welding cable, a constant-current power source, and a box of rods. It is also why the process survives in places other arcs struggle: a windy hillside, a muddy trench, a basement with no power (run the machine off a generator instead), or a repair where the metal has not been cleaned in twenty years.

Compare that with MIG, where you assemble a wire feeder, gas line, liner, contact tip, and drive rolls before the first arc — see how a spot welder works for an example of a completely different approach where pressure and heat replace the arc entirely.

One more thing worth knowing before we get technical: the electrode you pick controls nearly everything about the weld — penetration, position capability, bead shape, and strength. We decode the numbers in our guide to what electrodes are in welding and how to choose them. With the definition settled, let’s walk through how the process actually runs, step by step.

How the SMAW Process Works, Step by Step

Shielded metal arc welding looks almost suspiciously simple from the outside: a welder touches a coated rod to metal, sparks fly, and a bead appears. Behind that simplicity is a carefully choreographed sequence of events happening in fractions of a second. Understanding that sequence is what separates someone who can “make sparks” from someone who can lay a weld that passes inspection. Here is what actually happens, from the first flick of the wrist to the moment you chip the slag and reveal the finished bead.

Step 1: Striking the Arc

Nothing happens until an electrical circuit is completed. The electrode touches the workpiece, current flows, and as you pull back slightly, the air gap ionizes into a plasma arc that burns at roughly 6,500°F or more. Two techniques get you there:

• Scratch start: Drag the rod across the surface like striking a match, then lift to a normal arc length. It is forgiving and is what most beginners learn first.
• Tap start: Touch the rod tip straight down to the metal and lift immediately. It gives more control in tight spaces but demands a steadier hand, because lingering too long welds the rod to the plate.

Either way, the biggest beginner mistake is geometry, not motion. Hold the electrode perpendicular to the work and the tip sticks fast, because the short circuit heats the rod without enough arc gap to sustain plasma. Angle the rod slightly and pull away about an eighth of an inch, and the arc catches cleanly. The AWS Welding Digest guide to making a quality SMAW weld walks through the same fundamentals that every certified welder trains on.

Step 2: Arc Initiation and Metal Transfer

Once stable, the arc melts three things at once: the tip of the core wire, the base metal beneath it, and the inner portion of the flux coating. Molten droplets of filler metal detach from the rod and cross the arc into the weld pool. Depending on amperage, polarity, and rod type, that transfer can be a fine spray of tiny droplets or a series of larger, rhythmic globs. Either way, the goal is the same: land the metal in the pool, not beside it.

Step 3: Flux Decomposition — Gas and Slag

This is the “shielded” in shielded metal arc welding. As the arc heats the coating, it breaks down into several products:

• Shielding vapors that form a protective envelope around the molten pool, keeping oxygen and nitrogen out. This is why SMAW works in wind and outdoors, where a gas-shielded MIG setup would blow its coverage away.
• Molten slag, a lighter liquid flux that floats on top of the denser weld metal and solidifies first, physically blocking contaminants.
• Deoxidizers and alloy additions that clean the puddle and adjust the chemistry of the deposited metal.

Step 4: Solidification and Slag Removal

Behind the moving arc, the pool cools and the floating slag freezes into a hard, glassy crust. That crust must go before the next pass, or it gets trapped as an inclusion and weakens the joint. Welders chip it with a chipping hammer, then attack the residue with a wire brush or grinder until the bead underneath is bright and clean. A rod burns down to a stub of roughly one inch, you unclamp it, snap in a fresh electrode, and continue. Little of this time actually deposits metal, which is exactly why our Short Note below matters.

Step 5: Why Electrode Angle Matters

Travel angle and work angle control penetration, bead shape, and whether the arc stays lit. Most flat and horizontal SMAW work uses a 10° to 15° drag angle, with the rod tilted back from the direction of travel. Push too far forward and you get shallow penetration and a tall, narrow bead. Hold the rod dead perpendicular and the tip sticks repeatedly, as covered in our guide to push versus pull technique in stick welding. In overhead positions the angle tightens further and arc length shortens, or gravity pulls the pool out of shape.

Run that sequence a few hundred times and it becomes muscle memory. The good news for beginners: stick welding is genuinely learnable in a handful of sessions once you understand what the arc is doing underneath your hands.

SMAW Equipment and Setup: What You Actually Need

One of the quiet advantages of stick welding is how little it demands. There is no gas bottle to strap into a truck, no wire spool to feed, no torch liner to clean out. A basic SMAW setup can live in a corner of a garage: a transformer-rectifier machine plugged into a 230 V outlet, a coil of cable, a holder, a clamp, a box of rods, and a helmet. The same rig, swapped for an engine-driven generator, can run a hundred yards from the nearest wall outlet in a muddy trench. That range, from garage convenience to field survival, is what makes the equipment list worth understanding properly.

The Power Source: Why Constant Current Matters

SMAW requires a constant-current (CC) power source. The welder’s hand moves constantly, stretching and shortening the arc several times a second, and a CC machine responds by holding current steady while voltage swings. If it did the opposite, small arc-length changes would cause violent current spikes or a sputtering, dying arc.

Three machine types cover almost every situation:

• Transformer-rectifier: The classic shop machine. Mains-powered, heavy, simple, and usually the cheapest way to get into stick welding. It converts AC line power to smoothed DC output.
• Engine-driven generator: A diesel or gas engine turns an alternator that makes welding current. This is the go-anywhere machine, essential for pipeline work, farm repairs, and disaster response where grid power simply does not exist.
• Inverter: Modern electronics convert power at high frequency, making the machine dramatically lighter, more efficient, and more adjustable. A 160 A inverter stick welder can weigh less than a car battery yet run 6018 rods all day.

Polarity: DCEP, DCEN, or AC

Polarity decides which way current flows, and it changes penetration depth, deposition rate, and how the arc behaves.

If you can only own one polarity, make it DC, and match the rod to it. Most electrode datasheets list recommended polarity right on the carton.

Setting Amperage: The Decimal Rule of Thumb

Amperage selection is where beginners guess and professionals calculate. A neat trick taught in AWS’s Welding Digest guide to making a quality SMAW weld is to convert the electrode’s nominal diameter into a decimal and treat it as your starting amps. A 3/32-inch rod is 0.09375 of an inch, so start near 93 A and adjust from there based on the puddle’s behavior. A 1/8-inch rod starts around 125 A; a 5/32-inch rod starts near 156 A. From that baseline you trim down for thin material or out-of-position work and push up for flat, heavy plate. For a deeper dive into dialing a specific rod, see our 3/32 E7018 amperage, polarity, and running guide.

Arc Force, Hot Start, and Other Useful Features

Modern DC machines add two features that make stick welding much easier:

• Arc force (also called “dig”) temporarily boosts current when the machine senses the arc shortening, which prevents the rod from freezing to the work and helps force the puddle into place when welding overhead or vertically up. Turning dig up makes the arc harsher but far more forgiving.
• Hot start gives a brief current boost during arc initiation, so the rod strikes cleanly instead of sticking on the first try. It is a blessing for beginners and for anyone tacking repeatedly.

The Rest of the Kit

Beyond the power source you need an electrode holder (the “stinger”) rated for your rod sizes, a work clamp for the return lead, and electrode and ground cables in good condition with solid, low-resistance connections. Damaged cable ends are a common cause of overheating and lost output, so it pays to know how to choose, install, and troubleshoot welding cable connectors that actually hold up.

Then comes personal protection. OSHA is explicit: employers must provide helmets or hand shields for all arc welding, cutting, and brazing operations under 29 CFR 1910.252(b)(2)(i)(A). A proper filter lens, shade 10 to 13 for most SMAW work, plus a hard hat or headshield, matters as much as the machine itself. Our complete guide to what welders wear covers helmets, leather, and shade selection in detail. AWS also publishes free safety and technical fact sheets you can download from AWS free resources.

Portability: The Deciding Advantage

This is where SMAW quietly beats every other process. Because the shielding comes from the flux on the rod, there is no gas line to freeze, no wire feeder to misfeed, and no bottle to run dry at the worst moment. Strap an engine-driven stick welder behind a truck and you can repair a snapped bucket arm, a trailer frame, or a cracked implement miles from power, in wind, in rain, and with nothing more than a handful of 7018 rods and a chipping hammer.

Understanding SMAW Electrodes: Flux, Classification, and Selection

When learning stick welding, the electrode you choose can be just as important as the machine itself. These consumable rods are what create the arc, add filler metal, and protect your weld from contamination. With the right selection, a beginner can lay a solid bead, while the wrong rod can lead to endless frustration. To fully utilize the process, it’s crucial to break down the anatomy, classification, and characteristics of these rods.

The Anatomy of an SMAW Electrode

Every stick electrode is made up of two main components: the core wire and the flux coating. The core wire acts as the filler metal, melting into the joint to form the weld. This wire is typically a mild steel alloy that is chosen to match the properties of the base metal being welded.

The outer layer, known as the flux coating, is where the true magic of shielded metal arc welding takes place. When exposed to the extreme heat of the arc, this coating begins to decompose and performs multiple jobs at once. According to AWS Welding Digest, the flux provides arc stabilization, deoxidizers for weld purity, and alloying elements that improve weld properties. Not only does it create a protective gas shield around the puddle, but it also forms a layer of slag that slows cooling and prevents atmospheric contamination.

Decoding the AWS A5.1 Classification

To standardize electrodes across the world, the American Welding Society (AWS) created the A5.1 specification for carbon steel SMAW electrodes. This classification is printed directly onto the rod, with each digit holding a specific meaning. The most common rods taught in AWS training programs are E6010, E6011, E6013, and E7018. Here’s a breakdown of the numbering system:

• E – Stands for “Electrode”, signifying it is a consumable electrode for arc welding.
• First Two Digits – Represent the minimum tensile strength in thousands of pounds per square inch (psi). For example, E7018 indicates 70,000 psi minimum tensile strength, whereas E6010 indicates 60,000 psi.
• Third Digit – Represents the welding positions that the electrode can be used in. A “1” means the rod can be used in all positions (flat, horizontal, vertical, and overhead), while a “2” means it is only suitable for flat and horizontal welds.
• Fourth Digit – Reveals the coating type and current compatibility (AC, DCEN, or DCEP). This is what heavily affects arc characteristics, such as those seen between E6010 (cellulosic) and E6011 (cellulosic, AC compatible).

The Three Freeze Characteristics

Beyond the number, each electrode falls under a “freeze” characteristic. This refers to how quickly the molten puddle solidifies, directly impacting position capability and control. These three categories are utilized by welders in the field to combat gravity:

• Fast-Freeze – These rods solidify extremely fast, allowing welders to battle the pull of gravity while welding out of position. This makes them ideal for vertical and overhead passes. E6010 and E6011 are prime examples of fast-freeze electrodes.
• Fill-Freeze – A middle ground between the two extremes, fill-freeze rods solidify at a moderate pace. They provide a great blend of penetration and puddle control for general fabrication. E6013 is the most well known fill-freeze electrode, commonly used for beginner practice.
• Fast-Fill – These electrodes melt and deposit filler metal at a rapid rate to maximize productivity. However, their slow solidification makes them best suited for the flat and horizontal positions. The staple fast-fill, low-hydrogen rod is E7018.

Low-Hydrogen 7018: Storage, Handling & Matching to Code

Out of all of the rods listed, E7018 is one of the most utilized for structural and code work. Being a low-hydrogen electrode, its flux is designed to drastically reduce the amount of hydrogen introduced into the weld. Excess hydrogen can lead to cracking, especially on thicker steels. For this reason, AWS A5.1 stresses proper care for these rods.

Low-hydrogen electrodes are hygroscopic, meaning they absorb moisture from the air. Once exposed, they must be stored in a heated rod oven to prevent moisture pickup. A general rule of thumb for E7018 is to keep them at a minimum of 250 °F (121 °C) after opening, depending on your welding code requirements. Re-baking is only permitted under specific code allowances, so always refer to your WPS or applicable standard. When matching electrodes to base metal and code, be sure to factor in tensile strength, chemical composition, and service conditions. This is especially prevalent for structural jobs abiding by specifications such as AWS D1.1.

Common SMAW Rods At A Glance

With these fundamentals in tow, the seemingly cryptic numbers on a box of electrodes will begin to make perfect sense. By understanding flux, classification, and freeze characteristics, you’ll be able to confidently select the perfect rod for any SMAW job that comes your way.

SMAW Applications and Industries: Where Stick Welding Wins

SMAW does not win beauty contests. MIG lays down cleaner beads faster, and TIG produces the most polished, cosmetic welds money can buy. But ask an experienced welder which process they would want when the power is out, the wind is blowing, the steel is covered in rust and mill scale, and the nearest shop is an hour down a dirt road, and the answer is almost always the stick welder. Shielded metal arc welding is not the flashiest process in the trade; it is the one that shows up everywhere else refuses to go.

Construction and Structural Steel

From high-rise moment connections to bridge girders, structural ironworkers still run stick on a large share of field joints. Buildings and bridges are welded in the open air, overhead, on vertical column splices, and often in weather that would blow a MIG shield gas away in seconds. The AWS D1.1 Structural Welding Code for Steel spells out exactly how SMAW joints must be cleaned, how beads and passes should be placed, and what visual acceptance criteria inspector crews look for, and those same rules are what trade programs drill into students from day one. Because the electrode carries its own shielding in the flux coating, a welder can reposition, strike an arc, and complete a joint on structural plate without dragging a gas bottle up a scaffold. Positional work is where stick earns its reputation, especially overhead 4F and 4G welding, which remains one of the hardest certifications to pass.

Pipeline and Field Repair

Long-distance pipeline construction runs on root passes made with 6010-class rods in open root positions, followed by hot, fill, and cap passes a welder can complete without shop conditions. The same logic applies to repairs on pipelines, pump skids, and meter stations, where procedures, positions, passes, and inspection requirements are documented in detail through resources like pipe welding procedures and WPS planning. In these environments the welder may be standing in mud, working at night, or welding on a joint that cannot be moved to a bench.

A Real Field Repair: Crusher Frame at the Quarry

Consider a scenario that plays out almost weekly somewhere in industry. A support bracket on a rock crusher cracks at the weld toe after months of vibration. The machine is 40 miles from the nearest fabricator, the yard is dusty, the plate has surface rust and a coat of faded paint, and a stiff crosswind is kicking up grit. There is no shielding gas to protect, no wire feeder to load, and no clean shop floor. The maintenance tech backs a small engine-driven welder into position, grinds the crack into a proper groove, strikes a root pass with a 6010 rod that cuts through the contamination, then caps with 7018 for strength and finishes by chipping slag and brushing the beads. Two hours later the crusher is running. That is the entire value proposition of SMAW: one machine, a box of rods, and the ability to make a sound repair where nothing else fits.

Shipbuilding, Heavy Equipment, and Off-Highway Machinery

Shipyards weld thick hull plate in all positions, often with low-hydrogen 7018 electrodes to keep hydrogen-induced cracking under control on restrained joints. Heavy equipment manufacturers and repair shops use stick for buckets, booms, frames, and wear plates, including specialty hardfacing rods that restore abrasive surfaces on excavator teeth and crusher liners. Agriculture, mining, and forestry maintenance crews favor it for the same reason: the electrode is the entire consumable, so a single tote of rods covers multiple jobs and metals. The process handles carbon steel, stainless steel, and cast iron, plus certain nonferrous metals such as nickel-based alloys and bronze, which gives a field welder unusual range from one power source.

Nuclear, Pressure Vessel, and Code-Critical Work

Code work is where SMAW’s predictability pays off. Pressure vessels, boiler headers, nuclear piping supports, and gas transmission components are welded under qualified procedures that specify electrode classification, amperage range, polarity, interpass temperature, and preheat. Low-hydrogen rods must follow strict handling rules, and every weld is traceable to a welder who holds a performance qualification. Welders on gas systems also face purging and leak-test requirements covered in gas line welding codes and purging rules. Inspectors care less about how the weld looks on Instagram and more about whether it meets the acceptance criteria in the governing code, and stick delivers consistent, inspectable results.

Outdoor, Windy, and Less-Than-Clean Metal

This is the clearest dividing line between SMAW and the gas-shielded processes. MIG and TIG rely on an external envelope of argon, CO2, or a mix to protect the molten pool, and even a moderate breeze can disrupt that envelope and introduce porosity. SMAW has no such weakness: as the flux coating burns, it produces a gas cloud and a layer of slag directly over the puddle, which is why the process tolerates surface contamination far better than gas-shielded alternatives. Paint, light rust, and mill scale can be bridged by the right rod, though cleaning still improves quality. Wind, light rain, and temperature swings that would send a MIG welder chasing porosity rarely stop a stick welder. The tradeoff is simple: you gain weather tolerance and portability, and you accept more spatter, more cleanup, and a slower deposition rate.

Why Portability and Simplicity Keep SMAW on Top

Portability is the practical reason SMAW survived every wave of newer technology. A stick machine can be powered by an engine-driven generator parked in a truck bed, which means welding is possible at construction sites, on rooftops, in remote fields, and inside unfinished buildings long before permanent power exists. Compare that with processes that need line voltage, a gas cylinder, and a wire feed system. Setup is a matter of clamping the work lead, selecting a rod, and dialing in amperage, which is why learning stick welding remains the standard entry point in welding schools before students ever touch a MIG or TIG machine.

That combination of reach, forgiveness, and code acceptance is why shielded metal arc welding still appears on job sites from shipyards to pipeline right-of-ways. It will not replace MIG for production speed or TIG for precision, but for the work that happens away from an ideal shop floor, stick welding remains unmatched.

SMAW vs. MIG vs. TIG: An Honest Process Comparison

Ask ten welders which process is best and you will get eleven strongly held opinions. The truthful answer is less satisfying: none of them wins everywhere. SMAW, MIG (GMAW), and TIG (GTAW) solve different problems, and the “right” choice depends on where you are welding, what you are welding, how thick it is, what the code requires, and how much cleanup time you can afford. This section lays the three processes side by side so you can choose with your eyes open instead of buying whichever machine was on sale.

Why No Welding Process Wins Everywhere

Every arc process is a trade-off between portability, deposition speed, control, and cost. Stick welding trades speed for go-anywhere simplicity. MIG trades versatility for productivity. TIG trades productivity for the finest possible control and finish. Understanding those trades is more useful than memorizing opinions, because the moment your job changes, the answer changes with it.

SMAW vs. MIG vs. TIG: Side-by-Side

Where Stick Welding Beats the Others

SMAW’s real advantage is independence. The electrode coating produces its own shielding gas and slag blanket, so a light breeze that would wreck a MIG or TIG puddle barely bothers a 7018. That is why Is Stick Welding Hard? An Honest Beginner’s Guide keeps pointing beginners back to stick: the skills transfer to every other process, and the equipment is the least expensive way to get started. A stick rig needs a power source, an electrode holder, a work clamp, and cables. No gas bottle to rent, no liner to clog, no wire feed to troubleshoot.

Stick also handles dirty, rusty, painted, or out-of-position work better than wire processes, tolerates thicker sections in a single pass, and runs off a portable engine drive far from any outlet. On field repair, structural joints, pipe, and heavy maintenance, that combination is hard to argue with.

When You Should NOT Use SMAW

Being honest about the downside keeps you from fighting your equipment. Skip stick welding when:

• You are welding thin sheet. Amps are hard to keep low enough, and blow-through happens fast. Stick Welding Sheet Metal: Amperage, Rod Choice, and Blow-Through Prevention covers the workarounds, but The Complete Guide to TIG Welding Sheet Metal is simply the better tool.
• You need production speed. MIG lays more metal per hour with less operator downtime, which is why it dominates automotive and fabrication shops.
• The finish is the product. Visible stainless, decorative work, and precision instrument welding belong to TIG, which offers superior finish and far finer heat control.
• You are doing lots of tack welds and repositioning. A MIG gun tacks instantly with one hand; changing stick rods constantly gets old fast.

The Real Cost Per Foot

Machine price is the wrong number to watch. Stick has the cheapest entry point but you pay in labor: an operator factor near 25 percent means the arc is only running about a quarter of the shift, and slag removal adds minutes to every pass. MIG’s consumables cost more per pound, yet continuous wire and minimal cleanup usually make it the cheapest per inch in a shop setting. TIG is consistently the most expensive per foot, because argon consumption and slow travel speeds dominate the invoice. For hobby and repair work, stick still wins on total cost because the consumable is a rod that stores forever in a dry bucket.

One last practical note: codes do not play favorites. Structural work qualified under the AWS Structural Welding Code may use any of the three processes, provided the procedure and welder are qualified for it. Choose the process that fits the job, then make sure the paperwork follows.

Common SMAW Problems, Defects, and How to Fix Them

After you learn to strike an arc and lay a bead, most stick welders hit the same roadblocks, and nearly every one has a simple fix. Because shielded metal arc welding leans heavily on technique, small changes to arc length, drag angle, or cleaning habits decide whether a weld passes or gets rejected. Here are the problems you will meet most often and how to correct them.

Porosity: Tiny Holes That Weaken Your Weld

Porosity appears as small gas pockets trapped inside or on the surface of your weld. These holes reduce cross-sectional strength and can lead to failure, especially in load-bearing joints. According to AWS training material, porosity is one of the first rejectable discontinuities new welders learn to spot during inspection.

• Root causes: Contaminated base metal, oil, grease, rust, paint, moisture on the plate, or a wet electrode.
• Fixes: Clean the base metal thoroughly before welding, use dry, properly stored electrodes, and avoid welding over mill scale or residue. For low-hydrogen rods, follow proper storage to prevent moisture pickup.

Slag Inclusions: Trapped Flux That Ruins Fusion

Slag is the protective crust left behind by the flux coating, but if it is not removed it becomes trapped between weld passes or along the toes, leaving a barrier that prevents proper fusion. These inclusions are highly visible at the toes and are caught under the visual inspection criteria set by AWS D1.1 for structural welds.

• Root causes: Skipping interpass cleaning, welding over solidified slag, or using a poor drag angle that allows slag to roll ahead of the puddle.
• Fixes: Chip with a chipping hammer, wire brush the entire bead before your next pass, hold a drag angle of around 10 to 15 degrees, and keep the arc short so the slag freezes behind the puddle.

Undercut: A Groove That Cuts Into Strength

Undercut is a groove melted into the base metal next to the weld toe and left unfilled by filler metal. It creates a stress riser and is one of the most common reasons for rejection. Excessive amperage, wrong travel speed, or a poor work angle are the usual culprits, and many inverters allow you to dial in arc force or dig control to tame this issue. For a deeper breakdown of acceptance limits, see our article on Welding Defects Undercut: Causes, Acceptance Limits, and How to Fix It.

• Root causes: Too hot of a setting, moving too fast, or holding the electrode too far from perpendicular on a fillet.
• Fixes: Lower amperage into the safe range for your rod diameter, slow your travel speed slightly, keep a steady work angle, use the arc force or dig feature, and hold a tight arc length.

Cold Lap, Lack of Fusion, Spatter, and Arc Strike Marks

Cold lap (also called overlap) happens when filler metal rolls over the base metal without fusing to it, and it often pairs with lack of fusion, where the weld fails to bond to the joint face. Spatter is the shower of molten metal thrown off by an erratic arc, while arc strike marks are accidental arcs outside the weld zone. AWS student training material covers identifying these rejectable discontinuities, and arc strike marks can be code-rejectable per D1.1 because they create hardened, crack-prone spots.

• Root causes: Low heat input, long arc length, incorrect travel speed, poor joint prep, or careless starts.
• Fixes: Increase amperage within the recommended range, keep a short, controlled arc, and use the proper technique. Technique matters even more out of position, which you can explore in our Overhead Stick Welding Guide. Strike arcs only in the weld joint area and grind any accidental arc strikes before inspection.

Sticking Electrodes, Amperage Symptoms, and Wet Electrodes

Few things are more aggravating than an electrode that keeps sticking to the plate. This is almost always a heat or technique issue, though a damp rod can worsen it. Incorrect amperage shows up in two extremes: too low leads to a sluggish puddle, sticking, and poor fusion, while too high causes excessive spatter, undercut, and a wide, flat bead with little control.

Final Checks Before Inspection

Before you call any SMAW weld complete, run a quick quality check. Verify interpass cleaning, confirm the bead profile is free of undercut or cold lap, and scan for arc strike marks. While aesthetics vary, structural work will be held to the visual inspection criteria of AWS D1.1. Keeping your station clean and your gear in order also ties into proper welding PPE for a safe workspace. With these fixes in your back pocket, the most common SMAW defects become easy to prevent and even easier to correct.

SMAW Safety: PPE, Fumes, Radiation, and Hazard Control

Shielded metal arc welding may look straightforward, but it is a concentrated heat source, a chemical reaction, and an electrical circuit all happening at close range. For this reason, safety must be a habit built rod by rod. The risks are well documented by OSHA’s welding, cutting, and brazing hazard guidance, and nearly every one of them can be controlled with the right gear and disciplined routines.

Eye Protection: Filter Shades for SMAW

The arc produces ultraviolet and infrared radiation strong enough to burn the cornea in minutes. This can lead to “arc flash” or “welder’s flash,” a painful condition often compared to grains of sand in the eyes. Shade selection is critical, and OSHA provides minimums for SMAW:

These are minimums. ANSI/AWS A9.1 safety guidance typically recommends darker shades, generally in the 10–14 range for typical structural stick work, as eye fatigue and visibility both matter. Auto-darkening helmets can help, but the lens must darken before exposure. For tasks like slag chipping, a hard hat, hearing protection, and a full face shield are just as important to prevent high-velocity chip injuries.

Clothing and Hand Protection

Never weld in synthetic fabrics, such as polyester, loose drawstrings, or frayed clothing. These materials can melt onto skin and worsen burns. Instead, wear flame-resistant leathers, including a welder’s jacket or apron and properly sized gauntlet-cuff leather gloves. For a full gear breakdown, see our complete guide to welding PPE every welder needs. You can also take a deeper look at everyday garments in what a welder actually wears.

Spatter burns are common, but avoidable. Keep sleeves down, your collar up, and no bare skin near the arc. If a burn does occur, our weld burn first aid guide covers proper treatment and prevention.

Electrical Shock

SMAW machines typically run at open-circuit voltages between 40 and 80 volts DC, with enough amperage to stop a heart. Wet or sweaty conditions, damaged cable insulation, and a poor work-clamp connection are the most frequent culprits. Always inspect cables daily, keep electrode holders dry, ground your machine properly, and never weld in standing water. For more on keeping leads secure, check out our welding connectors guide.

Fire Watch: The 35-Foot Rule

Sparks and hot slag can smolder behind walls, under equipment, or inside dumpsters. OSHA requires the welding area to be cleared of combustibles within 35 feet, or protected by fire-resistant curtains. A fire watch must be maintained for at least 30 minutes after welding ends to catch any smoldering material. These requirements are outlined in OSHA 1910.252.

Welding Fumes: What Is Actually in the Smoke

SMAW fume varies based on the electrode and base metal, but it can contain manganese, chromium, nickel, lead, carbon monoxide, and ozone. Stainless steel introduces hexavalent chromium, and galvanized steel produces zinc oxide. Chronic manganese exposure is associated with manganism, a Parkinson’s-like neurological condition. Welding fume is also classified as a probable carcinogen with documented lung cancer risk. For exposure limits specific to your work, reference OSHA’s welding safety fact sheet.

Ventilation and Respiratory Protection

Always follow the hierarchy: first, general room ventilation to dilute fumes; second, local exhaust ventilation with a capture hood close to the arc to pull fumes at the source. Respirators should only be used as a supplement, not a substitute. A half-mask with P100 cartridges for particulates, paired with organic vapor or CO cartridges when needed, requires proper fit testing. NIOSH’s welding hazard checklist can help with exposure assessments.

Confined spaces, such as tanks, trenches, or ship compartments, change everything. Fumes can reach instantly dangerous levels, and oxygen displacement can be fatal. Permits, continuous atmospheric monitoring, forced ventilation, and a standby attendant are non-negotiable.

Radiation Burns and Skin

Arc radiation acts like an intense sunburn. While “welder’s flash” affects the eyes, exposed forearms and the neck can redden within an hour of overhead work. Cover all skin, and use welding curtains or screens to protect bystanders from arc flash.

Safety is not a one-time checklist, but a skill that evolves with the process. Compare these requirements with our MIG welding safety guide. Keep in mind that processes like thermite rail welding and copper spot welding carry their own hazard profiles. To build safe habits from the start, check out our MIG welder setup walkthrough. The gear may change, but the discipline never does.

Learning SMAW: Training, Certification, Career Path, and Final Takeaways

Reading about stick welding and striking an arc are two different things. The good news: SMAW remains the most forgiving process to learn, the cheapest to set up, and the one employers still ask for first. You already understand the process, the rods, the defects, and the hazards. What remains is practical: how do you turn that knowledge into a skill, a certificate, and eventually a paycheck?

Picking a Training Route That Actually Works

Most welders start in one of three places: a community college or trade school program, a union or contractor apprenticeship, or self-teaching in a home shop. Trade programs give you structured booth time, an instructor who can watch your hand position, and machines you would never buy as a beginner. Apprenticeships pay you while you learn, which matters if full-time study is not an option. Self-teaching works too, but only with discipline: film your welds, cut them open, and be honest about what you see.

Whichever route you choose, coursework fills the gaps. AWS Welding Fundamentals I includes SMAW modules on electrode selection, process operations, and the variables that decide whether a bead comes out smooth or sloppy. The American Welding Society also publishes free articles, standards excerpts, and training previews that give you a second opinion outside your instructor’s. If you learn better by reading than watching, the Welding Digest breakdown on making a quality SMAW weld is a solid starting point.

Certification: What AWS B2.1 and D1.1 Really Mean

Walk into a fab shop and someone will ask, “Are you certified?” Technically, welders are qualified, procedures are qualified, and the employer does the certifying. AWS B2.1 covers welding procedure and performance qualification, while AWS D1.1 governs structural steel welding and is the code most structural shops test against. In practice, you run a test coupon in the position the job requires: 3G and 4G groove welds on plate are the everyday baseline, 6G on pipe is the golden ticket, and our guide to pipe welding procedures breaks down how WPS, positions, and passes fit together.

Your coupon gets cut, bent, and visually inspected against the code’s acceptance criteria. Pass, and the employer documents your qualification for that process, position, and material group. It does not expire in most cases, but a two-year absence from welding often means retesting.

Career Outlook and What Welders Earn

Numbers matter when you are deciding whether to invest in training. According to the U.S. Bureau of Labor Statistics, the median wage for welders, cutters, solderers, and brazers was $51,000 in May 2024, across roughly 457,300 jobs. Employment is projected to grow 2% from 2024 to 2034: slow but steady, not shrinking. The money concentrates in the right industries, with specialty trade contractors paying a median of $57,310, the highest-paying major industry for welders.

The entry barrier is refreshingly low. Typical entry-level education is a high school diploma plus moderate-term on-the-job training, so a motivated beginner with a weekend course and a home machine can realistically be job-ready within months, not years.

A Practical 30-Day SMAW Starter Plan

1. Days 1–7: Setup and safety. Buy or borrow a 160–200 A machine, a decent helmet, gloves, and leathers. Learn your machine’s settings and polarity. Practice striking arcs on scrap until the rod starts without sticking every time.
2. Days 8–14: Flat beads. Run stringer beads on 1/4-inch plate with a 3/32 E6013 or E7018. Hold a consistent 1/8-inch arc length and steady travel speed. Use the 3/32 E7018 amperage settings as your baseline rather than guessing.
3. Days 15–21: Joints and positions. Move to fillet and groove joints, then take the same joint into vertical and overhead positions. Expect porosity and sagging at first; reduce amperage slightly and slow your travel in overhead.
4. Days 22–30: Inspection and cleanup. Cut a coupon in half, look at the penetration, and diagnose your own defects before asking anyone else. By day 30 you should run a clean 7018 cap in flat and vertical without losing the arc.

Key Takeaways

• SMAW is portable, weather-tolerant, and still the standard first process in welding schools.
• Amperage, technique, technology, and quality are the four skills every course should teach.
• Qualification through AWS B2.1 or D1.1 opens shop doors, and it starts with a test coupon in your target position.
• A $51,000 BLS median and $57,310 in specialty trade contracting show a stable, livable career with a low entry barrier.

Common Questions from Beginners

Is stick welding hard to learn? Harder than MIG, easier than TIG, and far more forgiving of dirty metal. Most people lay a usable bead in a weekend and a respectable fillet in a month. Our honest beginner’s guide to stick welding difficulty covers what to realistically expect.

What rod should I buy first? A pack each of 3/32 E6013 for easy starts and E7018 for stronger, cleaner welds covers most beginner practice.

Do I need a certificate to start work? Not always, but without one you will be limited to non-structural repair work. Most employers prefer or require a performance qualification test.

Where to Go From Here

The backhoe story at the start of this guide carried one honest lesson: the welder who could fix something in the field, with basic equipment and no shop, was the one who mattered that day. Everything in this guide, from electrode classification to slag control to ventilation, points toward that same competence. Grab a rod, strike an arc, mess up a few beads, and keep going. The trade is waiting, the skills are learnable, and the first step is smaller than you think.

Frequently Asked Questions

What is shielded metal arc welding in simple terms?

Shielded metal arc welding (SMAW), also called stick welding, is a manual arc welding process that uses a consumable flux-coated electrode to melt and join metal. The flux coating breaks down into shielding gas and slag that protect the molten weld pool from atmospheric contamination.

Why is it called stick welding?

Because the electrode is a straight metal rod — a ‘stick’ — that is gripped in an electrode holder and consumed as you weld. The filler metal from the stick’s core becomes part of the weld.

What is SMAW used for?

SMAW is widely used for construction, structural steel, pipeline and field repair, shipbuilding, maintenance work, and welding outdoors or in remote locations where portable equipment and simplicity matter most.

What are the most common SMAW electrodes?

The most widely taught rods are E6010 and E6011 for deep penetration and root passes, E6013 for smooth beginner-friendly beads on light material, and low-hydrogen E7018 for high-strength structural welds that must meet code.

Is SMAW harder to learn than MIG welding?

SMAW has a steeper initial learning curve because you must master arc starts, arc length, rod angle, and slag removal. However, it teaches fundamentals that transfer directly to every other arc process, which is why many schools teach it first.

Can you weld outdoors with stick welding?

Yes. SMAW is the best choice for windy or outdoor conditions because the flux coating generates its own shielding gas, unlike MIG or TIG which rely on external bottled gas that wind can blow away.

What safety equipment is required for SMAW?

A welding helmet with the correct filter shade, safety glasses with side shields, leather gloves and jacket, and proper ventilation are essential. OSHA requires helmets or hand shields for all arc welding operations and specifies minimum lens shades based on amperage.

What is the difference between SMAW and arc welding?

Arc welding is the broad family of processes that use an electric arc as a heat source. SMAW is one specific type within that family, distinguished by its consumable flux-coated electrode that provides both filler metal and shielding.