Manual Metal Arc Welding (MMA/SMAW): The Complete Guide for 2026

A storm-wipped farm gate hinge snapped at 7 a.m. on a Monday, two miles from the nearest power outlet and 40 minutes from any welding shop. A single portable stick welder, a handful of 6011 rods, and one repair later, the gate was hanging again before lunch. That scene plays out every day around the world, and it explains why a 120-year-old process called manual metal arc welding still refuses to die.

What Is Manual Metal Arc Welding (MMA)? A Plain-English Introduction

If you have ever watched someone weld on a roadside repair, a farm, or a construction site, you were probably watching manual metal arc welding — even if nobody called it that. Depending on where you stand in the world, the same process answers to at least four different names.

One Process, Several Names: MMA, SMAW, Stick, and Flux-Shielded Arc

Manual metal arc welding (MMA) is also known as shielded metal arc welding (SMAW), stick welding, and flux-shielded arc welding. “MMA” is the common term in the UK and Europe, “SMAW” dominates in the United States under AWS terminology, and “stick welding” is the shop-floor nickname used almost everywhere. Different names, identical process: an electric arc struck between a flux-coated consumable electrode and the workpiece melts the electrode tip and the base metal, forming a weld pool that solidifies into solid metal.

Do not let the age of the process fool you. It remains one of the most widely used welding processes on Earth, and the reason is simple: the electrode carries its own shielding system, its own filler metal, and its own cleaning flux in one slim stick you can slip into a coat pocket. No gas bottle to drag around, no wire spool to feed, no delicate electronics to babysit.

How MMA Actually Works: The Arc, the Flux, and the Shield

Everything starts with electricity. A welding power source drives current through a cable, into the electrode holder, down the coated stick, across a gap, and back through the workpiece via the ground clamp. Close that gap and pull away, and an arc ignites. Arc temperatures reach roughly 5,000 °C — hot enough to melt steel instantly — while typical welding voltage sits between 15 and 45 V with currents from about 10 A to 500 A, depending on electrode size and the job.

Here is the genius of the process: that thin flux coating around the metal core wire. As arc heat hits it, the coating decomposes chemically. Take calcium carbonate, a common coating ingredient — under arc heat it breaks down into calcium oxide (CaO) and carbon dioxide (CO₂). The CO₂ forms a protective gas envelope around the molten weld pool, while the lime and other compounds float up as a liquid slag that solidifies over the cooling bead.

That gas blanket and slag blanket do exactly what an external shielding gas does in MIG or TIG welding: keep oxygen and nitrogen out of the molten metal. Without them, the weld would be porous, brittle, and structurally useless. This is why MMA works outdoors in wind that would blow a MIG gas shield away, and why it thrives in field conditions from shipyards to pipeline rights-of-way.

Why Do the Names Differ by Region?

The split comes down to history and standards bodies. European and ISO standards codified manual metal arc, emphasizing that the operator’s hand controls the electrode. The American Welding Society standardized shielded metal arc welding, emphasizing the flux shielding mechanism. Neither is wrong: buy electrodes in Germany, read an American welding procedure specification, or browse Australian job listings, and you will meet all three terms — all meaning the same stick in your hand. (One exception: flux-cored arc welding uses a similar idea but feeds wire instead, a different process entirely.)

Where MMA Sits Among the 80+ Welding Processes

Modern welding recognizes more than 80 different welding and associated processes, from laser beam welding to ultrasonic welding to the aluminothermic reactions used in railroad thermite welding. MMA/SMAW is among the most widely used of them, and consistently the first process taught in trade schools. Why? Because it teaches fundamentals. If you can read a puddle with a stick electrode, you can read a puddle with anything.

Resistance spot welding dominates automotive body assembly, as covered in how spot welders work; TIG welding sheet metal rules precision thin-material work; and flux-cored wire welding covers heavy fabrication at speed. MMA takes the rugged middle: any position, any weather, minimal equipment.

What Is MMA Welding Used For — and Is It Right for Your Job?

You will find MMA holding together structural steel in high-rises, pressure pipework in power plants, hulls in shipyards, and broken brackets on farm machinery at 7 a.m. on a Monday. It is the backbone of maintenance and repair welding, pipeline root passes, hardfacing, and any job where the welder walks to the work rather than the other way round.

Is it right for your job? Ask three questions. Is the location outdoors, dirty, or windy? MMA wins. Is the material moderate to heavy, roughly 3 mm and up? MMA handles it comfortably. Is portability more important than deposition speed? MMA wins again. If you instead weld clean thin sheet indoors all day, a wire or TIG process will be faster — see our complete MIG welder setup guide for that route.

That is manual metal arc welding in a nutshell: a century-old idea, refined but never replaced, that puts a complete welding system in a single coated stick. Next, we trace how it evolved and unpack the physics in detail.

A Short History of MMA Welding: From Carbon Arcs to Modern Electrodes

The story of manual metal arc welding does not begin with a rod in a holder. It begins with a battery, two pieces of charcoal, and a scientist trying to impress a room full of people. Almost every step in that story is still visible in the weld you lay down today, which is why the history is worth ten minutes before you ever strike an arc.

From Laboratory Spark to Melting Arc: 1800–1890

In 1800 the English chemist Humphry Davy generated a short, violent pulsed electric arc between two carbon points. Two years later, in St. Petersburg, Vasily Petrov pushed the experiment further and demonstrated a continuous electric arc — the first practical, sustained heat source hot enough to melt metal on command. For decades it stayed a laboratory curiosity, because nobody could yet turn that heat into a controlled, repeatable joint.

The rush began in the 1880s. Charles L. de Méritens patented carbon arc welding in 1881. Nikolai Benardos, working with Stanisław Olszewski, developed practical carbon arc welding equipment by 1885 and built a business around it. Aleksandr Slavyanov took the decisive step in 1888 by using a consumable metal electrode — the arc melted the rod itself, and the rod became the filler. In the United States, Charles L. Coffin received US patent 428,459 in 1890 for arc welding with a metal electrode, giving American industry its first real blueprint.

Other joining methods grew up alongside it — oxy-fuel cutting, forge welding, and specialized processes such as aluminothermic rail joining — but the consumable metal electrode idea is the direct ancestor of every stick rod you buy today.

The Breakthrough Nobody Talks About: Coated Electrodes, 1900–1927

Bare metal rods had a fatal flaw. The molten pool reacted with oxygen and nitrogen in the air, producing porosity and brittle welds. The fix was the flux coating, and it arrived in stages. Around 1904, Oscar Kjellberg of Sweden produced the first coated electrodes by simply dipping bare wire into carbonates and silicates and letting it dry. By 1912, Gustav Strohmenger had introduced a more refined coating, and the trade-off between deep penetration and smooth handling began to take shape.

The real tipping point came in 1927, when the extrusion process made coatings cheap and consistent enough for factory production. Electrode prices fell, quality became repeatable, and stick welding moved from a specialist craft into everyday fabrication. The 1950s added iron powder to the mix, boosting deposition rates and giving welders rods that ran faster with less effort.

Why Two World Wars Made Stick Welding the Default

Nothing accelerates a technology like a war. World War I forced shipyards, aircraft plants, and repair depots to replace riveting with faster fusion joining, and governments poured money into electrode research and welder training. World War II did the same on a far larger scale: Liberty ships, tanks, and airframes were assembled by welders working in every position, often with nothing more than a portable arc machine. Standardization followed, because the military needed rods that behaved the same way in every factory.

After 1945, the trained workforce and the electrode plants were already in place, so construction, pipeline, and maintenance work simply inherited them. That is how a wartime stopgap became the industrial default in barely two decades.

Why the Process Has Barely Changed in Over a Century

Strip away the inverter power source and the plastic packaging, and a welder from 1930 would recognize today’s process immediately: strike an arc, melt a coated rod, chip the slag. What improved was everything around the arc — lighter transformer and inverter machines, better alloy chemistry, tighter manufacturing tolerances, and far better protective gear such as the equipment covered in Welding PPE: The Complete Guide to Protective Gear Every Welder Needs.

That continuity is a selling point, not a limitation. The fundamentals you practice today are the same fundamentals that built bridges, ships, and pipelines through a hundred years of change — which is also why learning stick welding still feels like learning a craft with deep roots rather than a passing gadget. The next section looks at the physics behind that flux coating: what it actually does when it hits the arc.

How MMA Welding Works: The Physics of the Arc, Flux, and Slag

Strip away the romance and manual metal arc welding is a controlled chemical reaction happening about six inches from your face. A coated electrode touches the work, an arc strikes, the flux burns, gas envelops the puddle, slag floats on top, and metal freezes behind you. Once you understand each step, stick welding stops feeling like guesswork and starts feeling like a process you can predict.

Step 1: Striking the Arc

Everything begins with starting the arc, and there are two honest ways to do it:

• Scratch method: drag the electrode across the surface like striking a match, then lift to the correct arc length. Easiest for beginners.
• Tap method: touch the rod down and lift it straight back. Cleaner start, but it takes more control because sticking is common.

Most newcomers stick the rod to the plate on their first dozen attempts. That frustration is normal, and it’s the main reason our Is Stick Welding Hard? An Honest Beginner’s Guide recommends practicing starts on scrap before touching real work.

Step 2: Angle and Arc Length

Two geometry rules control the whole weld. First, arc length should stay roughly equal to the electrode’s core wire diameter — too long and the arc wanders, gases escape, and you lose penetration; too short and the rod sticks. Second, work and travel angles matter: most operators run with the electrode tilted about 15° back from vertical, pulling the puddle along. Push versus pull is genuinely debated, so it’s worth reading Push or Pull Stick Welding: Which Technique is Right and Why before you settle into a habit. Overhead work changes the math again, which our Overhead Stick Welding guide covers in detail.

Step 3: Metal Transfer and the Heat Zone

The arc heats the work and the electrode tip simultaneously, creating a small molten pool in the base metal while the core wire melts and drips across the arc gap. This transfer is short-circuiting and globular in character rather than a smooth spray, which is part of why SMAW tolerates position and wind so well. As The Fabricator’s stick welding basics explains, arc length, amperage, and travel speed are the three dials that decide how much metal goes where.

Step 4: The Flux Does Four Jobs at Once

The coating is the clever part. As the arc burns it, the flux:

1. Shielding — decomposes into a gas blanket that keeps oxygen and nitrogen out of the puddle.
2. Slag protection — forms a liquid slag layer that floats on the molten metal, slowing cooling and protecting the bead as it solidifies.
3. Arc stability — ionising elements such as sodium and potassium keep the arc conductive and easy to restrike, especially on AC.
4. Alloying — adds deoxidisers and, in low-hydrogen rods, controlled amounts of manganese, silicon, and molybdenum.

Cellulosic coatings are the extreme example: they contain up to 30% or more wood flour, applied as a thin film only 12–15% of the electrode’s diameter, which produces a forceful, deeply penetrating arc with a wispy, fast-disappearing slag. As ScienceDirect’s SMAW overview notes, coating chemistry is what makes one rod behave completely differently from another.

Step 5: Solidification and Slag Removal

Behind the moving arc, the pool freezes. The slag solidifies into a glassy crust that you chip off with a pointed hammer and clean with a wire brush. If that crust traps inside the bead, you get slag inclusion — a rejectable defect. Heavy deslagging between passes is exactly why real-world duty cycles drop so hard.

Electrodes Fall Into Three Freezing Families

Coatings group into predictable behavior patterns, which is the fastest way to choose a rod:

• Fast-freeze (cellulosic): solidifies quickly, ideal for root passes and out-of-position work. Think E6010 and E6011.
• Fill-freeze or fast-follow (rutile): stays fluid a little longer, giving a forgiving, smooth arc. Think E6013 and E7013.
• Fast-fill (iron powder): high deposition, flat-position speed. Think E7014, E7024, and E7028.

For a full breakdown of what the numbers mean, see What Are Electrodes in Welding? Types, Numbers, Polarity & How to Choose, and Lincoln Electric’s AWS classification reference for the official classification structure.

Once these five steps click, stick welding becomes repeatable: strike, set the angle, hold the length, watch the puddle, chip the slag. The physics never changes — which is precisely why a 120-year-old process still earns a place in every welder’s toolbox.

MMA Equipment Setup: Power Sources, Holders, Cables, and Settings

One of the biggest reasons manual metal arc welding has survived for more than a century is how little gear it actually needs. A stick welder can run off a noisy diesel generator on a hillside, be carried up a ladder, or sit in the back of a pickup for a decade. But “simple” does not mean “anything goes” — arc quality, crew safety, and equipment life all depend on how the package is assembled. Here is what a complete MMA setup looks like.

The Power Source: Why Constant Current Matters

Every MMA machine is a constant-current (CC) power source. As you stretch or shorten the arc, the voltage swings, but the machine holds amperage steady so the melt rate stays predictable. That single characteristic is what lets a welder feel the puddle instead of fighting the machine. Within that category, there are three generations of equipment:

• Transformer: AC output, heavy, rugged, virtually indestructible. Still common in teaching shops and on sites with stable mains power.
• Rectifier: Transformer plus diodes or SCRs to produce DC. Heavier than an inverter but smooth-running and forgiving.
• Inverter: Electronics chop the incoming frequency, so the transformer shrinks dramatically. Modern stick machines often weigh 15–25 pounds.

Output current matters as much as the machine type. AC is cheap, simple, and useful on magnetic or heavily coated steel, but the arc is less stable and the penetration is shallower. DC gives a quieter, more directed arc. Welding codes and most low-hydrogen electrodes assume DC, and polarity decides the character of the bead: DCEP (electrode positive) drives deeper penetration and is correct for E6010, E7016, and E7018; DCEN (electrode negative) puts more heat into the work and runs fast-fill rods like E7024 with higher deposition.

Transformer vs Inverter: The Practical Difference

The old debate is mostly settled. A 250-amp transformer machine can weigh 100 pounds, while a comparable inverter draws far less input power for the same output, starts easily on small portable generators, and runs more efficient — which is why almost every mobile welder has switched. Inverters also add useful extras: arc force to prevent stick-outs, hot start for easier ignition, and sometimes a lift-TIG mode. Transformers still win on purchase price and on repairs in remote shops, where there is little electronics to fail.

Cables, Electrode Holder, and Ground Clamp

The accessories are where cheap setups get dangerous. The electrode holder must be specifically designed for arc welding and rated for the maximum current of the electrodes you run — a generic clamp will overheat, melt its insulation, and hand the voltage to your glove. Ground clamps deserve equal attention: a weak ground forces the arc to compensate, and poor return conductivity shows up as an erratic bead. Undersized or stretched leads cause voltage drop, so match cable gauge to the length of your run. For details on choosing and servicing the connections themselves, see Welding Connectors Explained.

Two cable rules from OSHA’s welding standards are worth memorizing:

• No splices within 10 feet (3 m) of the electrode holder. A repair joint sitting right where the cable flexes is asking to fail mid-arc.
• Spread out coiled cable before use. Current running through a tight coil creates inductive heating that cooks the insulation from the inside out.

Setting Amperage and Choosing a Diameter

Start with electrode diameter, then adjust to the puddle. Typical ranges for common mild-steel rods:

Dial in at the low end and raise amps until the slag flows smoothly and the puddle wets into the toes. For exact numbers on the most popular rod, start with 3/32 E7018 Amperage: Settings, Polarity & How to Run It, then step up to 5/32 E7018 Amperage: Settings, Polarity & Technique as plate thickness grows. Polarity, current type, and coating interact, which we decode fully in What Are Electrodes in Welding? Types, Numbers, Polarity & How to Choose.

PPE and the Small Tools That Matter

The kit is not complete without a shield or helmet with the correct filter shade, flame-resistant jacket and gloves, safety glasses worn under the helmet, a chipping hammer to remove slag, and a wire brush for interpass cleaning. The full equipment list lives in Welding PPE: The Complete Guide to Protective Gear Every Welder Needs (2026). Clamp your work so the ground attaches to the workpiece itself, never a bench rail, gas bottle, or scaffold, and keep spare holder tips and a grounding brush in the same box.

Decoding the Electrode: AWS A5.1 Classification Explained

Open a carton of stick electrodes and the same five characters are stamped on every rod: E6010, E6013, E7018. That code is a compact spec sheet. It tells you the rod’s tensile strength, the positions it can weld, what the coating is made of, and which current it runs on. Read it once and you can pick the right rod off the shelf without asking anyone.

The system comes from the American Welding Society’s AWS A5.1 specification for carbon steel electrodes, and every manufacturer uses the same language. As the Lincoln Electric AWS classification chart explains, the digits mean the same thing whether the rod came from Lincoln, ESAB, or voestalpine’s stick electrode line.

The Four Digits, One by One

1. E — electrode. It confirms you’re holding a consumable stick rather than bare tungsten or filler wire.
2. The first two numbers (60 or 70) — minimum tensile strength of the deposited weld metal in thousands of psi. E60xx rods must reach 60,000 psi (about 415 MPa); E70xx rods reach 70,000 psi (about 480 MPa).
3. The third number (1 or 2) — welding position. A “1” means all four positions: flat, horizontal, vertical, and overhead. A “2” limits the rod to flat and horizontal work, which is why high-deposition rods like E7024 and E7028 carry a 2.
4. The fourth number — coating type and usable current: cellulosic, rutile, basic (low-hydrogen), or iron powder, plus whether the rod runs on AC, DCEP, DCEN, or a combination.

So E7018 reads as: electrode, 70,000 psi minimum tensile, all positions, low-hydrogen iron-powder coating. A well-run E7018 bead actually measures closer to 72 ksi (500 MPa) tensile, 60 ksi (420 MPa) yield, and about 22% elongation, which is why it is the default answer for structural work.

The Standard Electrodes, Side by Side

Typical deposited tensile values track the prefix: E6010 and E6011 land near 62 ksi (430 MPa), E6012 and E6013 near 67 ksi (460 MPa), while the 70xx family clears 70 ksi as a minimum. For deeper background on coatings and polarity, see our guide to electrode types, numbers, and polarity.

Suffixes: H4, H8, H16, R, and -1

Letters after the numbers matter most when hydrogen cracking is a risk. The H codes set a ceiling on diffusible hydrogen in the deposited weld metal, per 100 grams:

• H4 — less than 4 mg (4 mL) of diffusible hydrogen per 100 g of deposited weld metal
• H8 — less than 8 mg per 100 g
• H16 — less than 16 mg per 100 g
• R — moisture-resistant covering, so the flux picks up water far more slowly from humid shop air
• -1 — supplemental optional requirements, usually mandatory impact toughness testing

A rod marked E7018-H4R combines a strict hydrogen limit with a moisture-resistant coating, and it can be used for up to nine hours after removal from its sealed packaging while still meeting that limit. Open a plain E7018 carton and the clock starts at roughly one hour in humid conditions.

Using the Code as a Buying Guide

Match the code to the job in this order: material condition first, position second, thickness third.

• Rusty, painted, or out-of-position repair: E6011 on AC, the rod most farm and maintenance welders keep in the truck.
• Pipeline or thick-plate root: E6010 on DCEP, as covered in our pipe welding procedure guide.
• Thin sheet and body panels: E6013 at low amperage, detailed in our stick welding sheet metal guide.
• Structural, code, or load-bearing work: E7018, ideally an H4R variant, with amperage matched to rod size — start with our 3/32 E7018 amperage chart and step up to the 5/32 E7018 settings on heavier stock.
• Flat production welding where speed rules: E7024, E7027, or E7028 for heavy deposition with minimal cleanup.

Store low-hydrogen rods in their sealed wrapper or a rod oven, keep cellulosic rods dry but never bake them, and don’t assume an all-position rod runs comfortably overhead in someone else’s hands. The code tells you what the rod can do; practice — as our beginner’s guide to stick welding notes — tells you what you can do with it today.

Choosing the Right Rod: E6010 vs E6011 vs E6013 vs E7018 in Real Jobs

Ask ten welders which rod they keep in the truck and you’ll get ten different answers, and every one of them will be right for their own work. The electrode is the closest thing stick welding has to a personality dial: change the coating and you change penetration, bead shape, slag behavior, toughness, and how forgiving the arc is when the metal isn’t perfect. That’s why electrode selection deserves more thought than most beginners give it.

Scale first: SMAW electrodes account for roughly 20% of the filler metal market, with an estimated 150–200 million pounds consumed every year in North America. Most of that tonnage isn’t going into pristine shop welds. It’s going into repair, maintenance, and field work — exactly the jobs where the wrong rod costs you a grinding disc and a second attempt.

The Three Coating Families: Where Every Rod Comes From

Nearly every common stick electrode belongs to one of three coating families, and once you understand the family, the code becomes predictable.

Rod by Rod: What Each One Actually Does

• E6010 — Runs on DCEP only and delivers the deepest penetrating arc of the common stick electrodes. Its forceful, digging arc punches through mill scale, rust, and poor fit-up, which is why it is the pipeline root-pass standard. If the joint has to be fully fused at the root and nothing else will get there, this is the rod. Full details in pipe welding procedures.
• E6011 — The same cellulosic core, but with potassium added to the coating to stabilize the arc so it can run on AC as well as DCEP. That single change makes it the field-repair workhorse: old farm equipment, rusty plate, galvanized junk, and any job where the machine is AC or the polarity is unknown.
• E6013 — A high-titania potassium coating with shallow penetration, minimal spatter, and easy-to-clean slag. It’s the classic beginner rod and the right choice for clean, new sheet metal where a deep arc would simply blow through. See stick welding sheet metal for the amp range and settings.
• E7018 — The low-hydrogen structural rod. Dense, tough weld metal with excellent notch toughness and very little spatter, but the coating absorbs moisture, so a rod that has sat out for hours can cause porosity or hydrogen cracking. This is what inspectors look for on structural and pressure work. Our 3/32 E7018 amperage guide covers small-diameter settings in detail.
• E7014 and E7024 — Iron-powder rutile rods built for deposition speed. E7014 works in flat, horizontal, and vertical positions with a light, easy arc; E7024 is a heavy, high-deposition flat-and-horizontal rod for production welds where speed matters more than penetration.

Matching Rods to Real Jobs

Pipeline and pressure work: E6010 on DCEP for the root, then E7010 or E7018 fill and cap, always following the written procedure. Positions, passes, and preheat all matter here, and the rod choice is dictated by the WPS, not by the welder’s preference.

Construction and structural: E7018 is the default wherever the weld carries load and toughness is specified. Run it on DCEP, keep it in the rod oven or a sealed quiver, and never bake an electrode you haven’t checked. For the overhead positions common on beams, our overhead stick welding guide explains rod and amperage choices for 4F and 4G.

Farming and mobile repair: Carry 6011 and 6010. A 6011 on AC will burn through a rusty, bent, badly fitted bracket on a tractor hitch and still hold, and the rods are cheap enough to keep a full box in the welder. When the repair turns into hardfacing on a bucket or auger, specialty hardfacing electrodes take over — a market segment growing steadily with equipment repair demand.

Maintenance and thin-sheet fab: E6013 for clean sheet and light gauge, E7014 for fillets and lap joints where you want speed without fuss. If the job is a cosmetic repair on 16-gauge material, drop the amperage, use a short arc, and consider whether TIG on sheet metal isn’t the better answer anyway.

Beginners: Start with E6013 to learn puddle control, then move to E7018 for the habit of proper arc length, then E6011 for the reality of imperfect metal. If you’re just starting out, is stick welding hard gives an honest picture of the learning curve.

One last practical point: arc characteristics vary with coating chemistry, so polarity guidance on the box is not a suggestion. Running an E6010 on AC or an E7018 on DCEN will technically strike an arc, and the weld will show it. As Lincoln Electric’s AWS classification reference lays out, that fourth digit in the code tells you both the coating type and the approved current — read it before you strike.

Step-by-Step MMA Technique: Positions, Travel Speed, and Common Defects

A perfectly dialed machine still will not save a sloppy hand. The power source supplies the heat, but your hands decide whether that heat ends up in the joint or on the floor as spatter. This section walks through the physical routine that working stick welders run on every joint, then turns into a fault-finding guide for the defects that show up on nearly every practice plate.

Joint Preparation and Tacking: The Work Before the Arc

Reliable welds start before the switch is thrown. Brush or grind 25 to 40 mm (1 to 1.5 in) on both sides of the joint down to bright metal and wipe away oil, paint and cutting fluid, because burnt coating is one of the most common hidden sources of gas pores. Bevel the edges whenever the groove cannot be filled in one pass, and follow the joint detail and pass sequence laid out in your welding procedure specification instead of improvising.

Then tack. Four small tacks placed symmetrically hold fit-up and fight shrinkage; three tacks in one corner will pull the joint out of alignment as it cools. Thickness is rarely the limiting factor. SMAW rarely drops below about 1.5 mm (0.06 in) on the thin end — a range covered in our stick welding thin metal guide — and there is no practical upper bound, because heavy sections are simply filled with layered multi-pass welds.

Work Angle, Travel Angle, and Arc Length

Three numbers shape the bead. The work angle is the electrode’s relationship to the two pieces being joined: square-on (90°) for a butt joint, roughly 45° in a fillet so the arc splits evenly between the leg and the plate. The travel angle is how far you rake the rod back; for most stick work you drag, leaning 10° to 20°, with about 15° of drag as the classic starting point. Push or pull changes penetration, bead profile and slag behavior, and the trade-offs are worth reading in Push or Pull Stick Welding.

The arc length should stay roughly equal to the electrode core diameter. Stretch it out and the arc wanders, spatter jumps, the shielding envelope breaks down and the puddle takes in gas. Jam it too close and the rod sticks and drags out of the puddle. The fundamentals in The Fabricator’s stick welding basics match exactly what your eyes tell you puddle-side.

Travel Speed and Weave Patterns

The puddle, not the clock, sets your speed. Travel too fast and the bead goes narrow, ropey and crowned, with cold edges and poor sidewall fusion. Travel too slow and the bead flattens and widens, and on light material it blows straight through. On butt joints the leading edge of the puddle should stay visible just ahead of the rod; if it disappears under the electrode, you are dragging.

For weaving, circles, figure-eights and gentle zigzags all work. Pause briefly at each sidewall so the molten metal wets out instead of climbing the edge, and keep the weave to roughly three times the core wire diameter unless your WPS permits wider. Big, fast weaves look impressive and fuse badly.

All-Position Welding: Flat to Overhead

Positions carry their own shorthand: 1F/1G flat, 2F/2G horizontal, 3F/3G vertical, 4F/4G overhead. Flat is where beginners learn puddle control. Horizontal needs a slightly uphill work angle and a touch more speed so the bead does not sag. Vertical-up is slow, deep and strong for root and heavy groove passes, while vertical-down is fast and shallow, favored on thin sheet and quick rutile rods. Overhead is pure discipline, and Overhead Stick Welding covers rod choice, amperage and setup for 4F and 4G work.

Diagnosing the Common Defects

Chip the slag, look at the bead, and match what you see against the table below. Almost every disappointing stick weld traces back to one of these six causes.

Two of these deserve extra attention. Porosity is the quiet failure mode: pores often sit below the surface and stay invisible without advanced nondestructive testing, yet they cut the load-bearing cross-section and sharply reduce weld strength, as the research summaries on shielded metal arc welding make clear. And cracking is almost always a hydrogen-and-moisture story. Basic, low-hydrogen electrodes such as E7018 offer medium penetration with excellent mechanical properties, which is why structural codes reach for them — but they are also the rods most easily ruined by a damp rod box or a careless start.

The cure for all of it is boring: clean metal, dry rods, correct settings, steady arc length and honest bead inspection after every pass. Run a few practice plates, chip the slag while the weld is still warm, and read the bead like a report card. That feedback loop is how technique actually gets built.

MMA Safety and Health: OSHA Rules, Fumes, PPE, and Hazard Control

While manual metal arc welding may look simple, it packs some of the most severe hazards in the trade into one workspace. With an arc reaching around 6,000°F, live electricity, molten spatter, and a toxic fume plume, the risks are very real. The key to prevention lies in controlling four categories: electric shock, radiation, inhalation, and fire. Here’s how to do just that.

Electric Shock: The Top Threat

Out of all welding hazards, electric shock is the most lethal. This is why the OSHA arc welding and cutting regulations (29 CFR 1910.254) heavily enforce its prevention. To drastically lower your risk, keep these practices in mind:

• Control your cables: Never coil your welding cable around your body. Doing so can trap you and hold a charge long enough to be fatal.
• Stay dry: Wet gloves, damp clothing, concrete, or bare steel all decrease your body’s resistance. Kneel on a dry, insulated board whenever possible.
• De-energize before contact: Always turn your machine off before changing rods, adjusting cables, or cleaning connections.
• Inspect daily: Check your leads, ground clamp, and electrode holder for cracks or frayed insulation prior to every shift.

OSHA caps open-circuit voltage for manual metal arc machines at 80 V AC and 100 V DC to minimize shock hazards. Modern inverters with lower open-circuit voltage offer a major safety boost. For proper upkeep of your leads and terminations, take a look at our guide to choosing and installing reliable welding connectors.

Additionally, the NIOSH welding safety checklist warns against resting any part of your body against the metal being welded. This small habit can be dangerous, especially when your clothing or skin is damp.

Arc Radiation and Eye Protection

The MMA arc emits both intense visible light and ultraviolet (UV) radiation. Without the correct protection, this can lead to welder’s flash and long term skin damage. For most SMAW applications, a helmet with shade 10 is sufficient, increasing to shades 12 through 14 for higher amperage.

Per 29 CFR 1926.351, welding screens and curtains must be utilized to shield nearby coworkers from radiation and spatter. It’s crucial to note that inert-gas processes (MIG and TIG) emit 5 to 30 times more ultraviolet radiation than SMAW. Due to this, OSHA strongly advises keeping any arc welding at least 200 feet from chlorinated solvents and degreasing equipment unless properly ventilated and shielded. These precautions are highlighted within OSHA’s welding, cutting, and brazing hazard guidance and their welding fact sheet.

Fumes, Metal Fume Fever, and Hexavalent Chromium

Every MMA electrode produces fumes containing iron oxides, silicates, and any alloying elements within its coating. Welding galvanized steel can expose you to zinc oxides, often causing metal fume fever. Symptoms such as chills, fever, and a metallic taste typically occur hours after exposure and subside within a day. Recurring episodes are always a sign of inadequate ventilation.

The greatest long term concern is hexavalent chromium (Cr VI), produced when welding stainless steel and chromated coatings. OSHA enforces a strict permissible exposure limit (PEL) of 5 µg/m³ as an 8-hour time-weighted average under 29 CFR 1910.1026 for general industry and 1926.1126 for construction. As outlined in the NIOSH welding fume criteria document, this limit requires engineering controls such as local exhaust ventilation or source-capture fume extraction. Respirators should only ever be used as a last line of defense.

For outdoor or large bay work, natural airflow may be enough for mild steel. However, in small enclosed spaces like a garage, fume extraction is non-negotiable. Always position yourself upwind of the plume whenever possible.

Confined Spaces, Hot Work, and Fire Prevention

Welding in a tank, pit, or vessel drastically increases the stakes. Confined space entry requires atmospheric testing for oxygen, flammable gases, and toxins, a written permit, forced ventilation, and a dedicated attendant. For these specialized jobs, reference our gas-line welding safety guide for industry accepted procedures.

Fire is one of the most common MMA incidents. Move all combustibles at least 35 feet away or cover them with flame-resistant blankets. Never weld on sealed drums or containers, a mistake that has led to fatal explosions as noted in the Texas Department of Insurance welding hazards resource. Most importantly, maintain a trained fire watch with a suitable extinguisher for a minimum of 30 minutes after welding ceases, extending it for insulated or layered structures.

PPE and Consumable Warnings

Your personal protective equipment is your final barrier against the hazards listed above. At a minimum, this should consist of a flame-resistant welding jacket with long cuffs, leather gloves, a leather apron for out-of-position work, steel-toe boots, safety glasses worn under your helmet, and hearing protection. For an in-depth breakdown, check out our complete guide to welding PPE or our welding PPE overview.

Lastly, never ignore electrode warning labels. As required under 29 CFR 1910.252, manufacturers must disclose toxic constituents in fluxes, such as fluorides or beryllium. Be sure to read these labels for every new rod, and properly store low-hydrogen electrodes (like E7018) in a sealed container or rod oven. This not only prevents hydrogen cracking, but also limits excess fume generation.

At the end of the day, these are not arbitrary rules. Each one was written in response to a preventable tragedy. By making these steps a non-negotiable part of your setup, you’ll be able to weld safely for a lifetime. For post-incident knowledge, our weld burn treatment guide is a great resource to have on standby.

MMA vs MIG vs TIG vs Flux-Cored: Honest Process Comparisons

Ask four welders which process is “best” and you will get four answers, each delivered with the confidence of someone who has never actually run the other three. The truth is less dramatic: every arc process is a bundle of trade-offs, and the right one depends on where you are standing, what the weather is doing, what the code requires, and how much cleanup time you can afford. Here is the honest comparison of manual metal arc welding against gas metal arc welding (GMAW/MIG), gas tungsten arc welding (GTAW/TIG), and flux-cored arc welding (FCAW).

The Filler Utilization Gap Nobody Talks About

This is where stick welding takes its biggest hit. Covered electrodes deliver roughly 65% filler metal utilization — the flux, the stub you throw away, and the spatter account for the rest. Gas metal arc welding sits near 95%, flux-cored welding runs above 80%, and TIG’s independently fed cold wire approaches 100% because none of it is consumed as coating. On a production line where filler is billed by the pound, that gap is real money. It is a big reason MIG setup and wire feed tuning have become core shop skills rather than optional extras.

The market has voted the same way. Covered electrodes’ share of filler metal sold has slid from 81% to 59%, with projections pointing toward 45%, while gas metal arc welding’s share has doubled from 10% to 20% and is expected to double again within a decade. Read that as a shop-owner’s signal, not an obituary: total electrode demand has stayed steady even as the share shrinks, because the applications that need stick never went away.

Where Each Process Genuinely Dominates

• MMA/SMAW: Anything outdoors, anywhere a gas cylinder is a liability, and any job where the machine has to survive a truck bed. SMAW is used exclusively in underwater welding and extensively in pipeline welding precisely because its flux generates its own shield. No wind, no problem. It also remains the cheapest entry point, which matters when you are starting from zero — see is stick welding hard for a realistic picture of that learning curve.
• GMAW/MIG: Production steel and aluminium, thin material, high duty cycles, and beginners who need to lay usable bead fast. It loses outdoors, since shielding gas blows away in even a light breeze.
• GTAW/TIG: Precision, cosmetics, exotic alloys, root passes on stainless, and thin sheet where heat control decides whether you have a part or a hole. It is slow, expensive, and unforgiving — details worth reading in the TIG sheet metal guide.
• FCAW:

  Thick steel, heavy structural, shipbuilding and outdoor fabrication where self-shielded wire gives you stick-like weather tolerance at MIG-like deposition. Slag cleanup is the price. Technique pointers live in flux core wire welding tips.

Choosing by Job, Not by Loyalty

A useful shortcut: if the workpiece can be moved into a shop, gas-shielded processes usually win on speed and cost per inch. If the workpiece is a bridge, a pipeline, a farm gate or a hull, the workpiece comes to you, and stick wins on logistics. Mobile welders often carry a MIG/TIG combo machine plus a small stick unit, covering 95% of call-outs without swapping mindsets mid-job.

Safety obligations shift with the process too: gas-shielded processes bring compressed cylinder hazards and different fume profiles, so a MIG shop’s controls should follow MIG welding safety precautions alongside the general OSHA welding, cutting and brazing requirements in 29 CFR 1926.351. Arc radiation and hot-work rules apply to all four processes equally.

The bottom line: stick welding loses on deposition, filler utilization and cleanup, and wins decisively on portability, wind tolerance, equipment cost and versatility in the field. That is not a participation trophy — it is exactly why a process invented before World War I still shows up on every jobsite on earth.

MMA Welding Applications, Careers, Costs, and the Future of Stick Welding

With the technique, equipment and safety covered, it only makes sense to look at where manual metal arc (MMA) welding is still earning its keep. Decades past its peak, the stick welder remains the go-to tool for trades held back by gas bottles, power outlets or imperfect workshop conditions.

Real-World Applications of MMA Welding

The greatest strength of shielded metal arc welding (SMAW) is its sheer versatility. Few processes can be thrown in a truck and put to work the same day, which is why it dominates maintenance and repair and stays common in heavy steel structure construction.

• Construction and infrastructure: From high-rise steel frames to bridges, stick welding is used for everything from tack-ups to structural connections. It is a staple for jobs that require mobility across large sites.
• Shipbuilding and offshore: The harsh, exposed nature of shipyards lends itself to SMAW, especially for repairs and for welding thick plates where deep penetration is required.
• Pipelines and energy: For field joins, pipe welding procedures often rely on rods such as E6010 for root passes. Its tolerance to wind and damp surfaces makes it invaluable for oil, gas and utility work.
• Agriculture and mobile welding: Much like the gate repair from the opening hook, farmers rely on portable stick machines to mend implements in the field, far away from a fixed shop.
• Power, mining and hardfacing: Power plants, mines and heavy equipment demand repairs on worn parts. In fact, the global hardfacing welding market was valued at USD 1.7 billion in 2023, with SMAW holding a 13.7% revenue share that year, showcasing its continued use for rebuilding and overlaying metal.

Careers, Certifications and Code Work

The demand for competent stick welders is still very real. Due to its use in critical infrastructure, many employers require proof of skill. The most accessible benchmark is the AWS Certified Welder program, which tests welders to specific codes. These can range from structural (AWS D1.1) to pressure piping, all of which heavily utilise SMAW. Most tests are hands-on: you weld a coupon in a fixed position, and it must pass visual and nondestructive inspection.

Before stepping onto a code job, proper welding PPE is non-negotiable. Depending on the site, you may also need to meet strict fume and electrical safety compliance, with OSHA 1926.351 setting clear standards for arc welding operations. With the right training, a stick welder can build a long career in industries that rarely outsource their repairs.

Realistic Equipment and Consumable Costs

One of MMA’s biggest draws is its affordability. A new, reliable inverter stick welder can be purchased for $150–$500, whilst heavy-duty machines can reach higher prices. Cables, an electrode holder and ground clamp, a chipping hammer and PPE will add roughly $100–$300 to your starter kit.

Electrodes are inexpensive, usually $3–$10 per pound depending on the classification. While deposition rates vary, specialized MMA variants can deposit up to 27 kg (60 lb) of weld metal per hour. That said, it is worth noting the trade-off: SMAW has a lower filler metal utilization (~65%) than GMAW (~95%) or GTAW (100% cold wire). For hobbyists and mobile welders, the portability and low upfront cost far outweigh this material loss.

The Future of Stick Welding

It is true that SMAW’s share of total arc welding is projected to fall to around a third of all arc welding processes. However, demand for electrodes remains steady, largely because of its irreplaceability in repair work, rural jobs and developing regions. Industry-wide, the welding sector has averaged roughly 6% annual growth, with projections of up to 8% annually and equipment shipments potentially doubling within five years, according to Grand View Research. Rather than dying out, stick welding is stabilising into its niche: the process you reach for when nothing else will work.

Actionable Tips for Beginners

1. Practice smart: Before tackling a live job, run beads on practice plates. Resources like “Is Stick Welding Hard? An Honest Beginner’s Guide” are a great starting point.
2. Store your rods properly: Low-hydrogen rods (such as E7018) are hygroscopic. Keep them in a sealed container or rod oven to prevent moisture absorption.
3. Nail your machine settings: Get your polarity and amperage right for your rod diameter. Guides such as 3/32 E7018 amperage and 5/32 E7018 amperage will take the guesswork out of it.
4. Prioritize safety: From preventing weld burns to avoiding common defects, never cut corners.

At the end of the day, MMA welding will never be the fastest or the flashiest process. Yet, as it has for over a century, it remains the most indispensable. When the nearest shop is hours away and the wind is howling, a portable welder and a pack of rods still get the job done. That alone makes stick welding an essential first skill to master.

Frequently Asked Questions

What is manual metal arc welding in simple terms?

Manual metal arc welding (MMA), also called SMAW or stick welding, is a process where an electric arc melts a flux-coated consumable electrode and the base metal to form a joint. The flux coating creates a gas shield and a protective slag layer, so no external shielding gas is needed.

What does the number on a welding rod mean?

In the AWS system, E stands for electrode, the first two digits give the minimum tensile strength in thousands of psi (E7018 = 70,000 psi), the third digit indicates usable welding positions, and the fourth digit identifies the coating type and required current. Extra suffixes like H4 or R describe diffusible hydrogen levels and moisture resistance.

Can MMA welding be used outdoors or in the wind?

Yes. This is MMA’s biggest advantage over MIG and TIG welding: the flux coating generates its own shielding gas, so the process works outdoors, in drafts, and even in light rain when proper electrical safety precautions are followed.

What is the difference between E6010 and E7018 electrodes?

E6010 is a cellulosic, deep-penetrating DC-only rod used mainly for pipeline root passes and dirty metal. E7018 is a low-hydrogen basic-coated rod producing stronger 70 ksi weld metal with excellent toughness, making it the standard for structural steel. E6010 has a digging arc and light slag; E7018 has a smooth arc and thick slag that must be fully removed.

Is stick welding stronger than MIG welding?

Strength depends on the filler metal and joint design, not the process name. However, MMA welding often produces excellent mechanical properties, and low-hydrogen E7018 welds offer outstanding impact toughness. SMAW’s deep penetration on heavy sections and all-position capability give it an edge in many structural and repair situations.

What are the main disadvantages of manual metal arc welding?

MMA is relatively slow, with an operator factor of roughly 25%, and it requires slag removal and frequent electrode changes. Filler metal utilization is only about 65%, lower than GMAW’s ~95%, and it demands more operator skill than semi-automatic processes.

What PPE is required for stick welding?

At minimum: a welding helmet with the correct filter lens shade, flame-resistant clothing with sleeves and collar closed, dry leather gloves, and safety footwear. Additional protection includes caps, aprons, and leggings for overhead work, plus ear protection where sparks can enter the ears.

Why do E7018 rods need to be stored carefully?

E7018 is a basic, low-hydrogen electrode whose coating absorbs moisture from the air. Excess hydrogen in the weld pool can cause hydrogen cracking, so unused rods should be kept in sealed packaging or a rod oven. H4R-designated rods tolerate about nine hours out of the package while still meeting low-hydrogen limits.

Is manual metal arc welding still relevant in 2026?

Absolutely. Although its share of filler metal sales has declined from 81% to about 59% as wire processes grow, MMA remains dominant in maintenance and repair, construction, pipeline, and shipbuilding. Its low equipment cost, portability, and self-shielding design keep it essential, especially for mobile and field work.

What are the most common MMA welding defects and how do I fix them?

The usual suspects are porosity (from contamination or moisture), slag inclusions (from inadequate cleaning between passes), lack of fusion (wrong amperage or technique), undercut (too much current or wrong travel speed), and hydrogen cracking (wet rods or restrained joints). Fix them by cleaning the joint, using correct settings, controlling interpass cleaning, and烘干 low-hydrogen electrodes before use.