3 Welding Types Explained: MIG, TIG, and Stick Welding

A farmer’s chopper blower band snaps in half during haylage season, and the nearest replacement is two days away — so he tacks it back together with a wire welder and keeps the harvest moving. That single roadside repair captures the question every new welder eventually asks: with more than 80 welding processes documented by the American Welding Society, which three actually matter, and when do you reach for each one?

The 3 Welding Types at a Glance: Your Answer in Two Minutes

A farmer’s chopper blower band snaps in half during haylage season, and the nearest replacement is two days away — so he tacks it back together with a wire welder and keeps the harvest moving. That single roadside repair captures the question every new welder eventually asks: with more than 80 welding processes documented by the American Welding Society, which three actually matter, and when do you reach for each one?

The answer is immediate: the three dominant welding types are stick welding (SMAW), MIG welding (GMAW), and TIG welding (GTAW). Despite AWS describing welding as involving more than 80 processes, these three carry the vast majority of manual fabrication work across shops, farms, and construction sites. Their dominance comes down to versatility, equipment simplicity, cost, and the fact that together they cover steel, stainless, aluminum, and field repairs. Also, workforce and wage data show these are the skills most employers ask for: the U.S. welding workforce was estimated at about 771,000 professionals in 2025 per WeldingWorkforceData.com (endorsed by AWS), and the Bureau of Labor Statistics reports a 2025 median annual wage of $53,750 for welders, cutters, solderers, and brazers across 437,700 jobs (BLS).

Here’s what each one is in plain language, plus where it fits:

• Stick welding (SMAW — Shielded Metal Arc Welding): the simplest and toughest of the three. An electric arc melts a coated metal electrode, and that flux coating forms its own shielding to block air. The electrode does triple duty — conductor, filler metal, and shield — so there’s no gas cylinder to drag around. That’s why stick thrives where MIG struggles: structural steel, pipeline repair, farm equipment, outdoor maintenance, rusty or painted plate, and windy days. The tradeoff is more spatter, a slag coating you have to chip and brush off, and a slower travel speed on clean sheet metal.
• MIG welding (GMAW — Gas Metal Arc Welding): the speed king. A continuous wire feeds through a gun while external shielding gas protects the puddle, so you never stop to change rods. Because the wire feed speed doubles as your heat control, MIG is widely considered the easiest of the three to pick up, and short-circuit transfer lets you run it on thin gauge without blowing through. It shines in auto body, light manufacturing, trailers, and production lines where you need clean, fast, repeatable welds.
• TIG welding (GTAW — Gas Tungsten Arc Welding): the precision specialist. A non-consumable tungsten electrode creates the arc, inert gas shields it, and you hand-feed filler rod with the other hand while a foot pedal varies amperage. That’s three things moving at once, which is why TIG has the steepest learning curve — but the payoff is a weld puddle you can place like a pencil line. It’s best for thin material, aluminum (run on AC), stainless, and exotic alloys when appearance and control matter most, and it’s the slowest of the three by design.

Factor	Stick (SMAW)	MIG (GMAW)	TIG (GTAW)
Filler	Consumable coated rod	Continuous wire spool	Hand-fed rod + tungsten
Shielding	Flux coating (self-shielded)	External gas bottle	Inert gas bottle
Learning curve	Moderate	Easiest	Steepest
Field strength	Best — wind and dirt tolerant	Good, but gas can blow away	Poor outdoors; needs clean metal
Fume output	Higher	Lower	Lowest

Miller Electric notes these three as the informal names (stick, MIG, TIG) everyone uses for SMAW, GMAW, GTAW — the “shop names” you’ll hear in most workplaces.

From a health perspective, these three differ in fume output: OSHA’s welding fact sheet lists arc welding types in order of decreasing fume production as FCAW, SMAW, GMAW, and GTAW — meaning stick (SMAW) produces more fumes than MIG (GMAW), and TIG (GTAW) produces the least among common arc processes. That doesn’t make stick dangerous when properly ventilated, but it does mean your fume-control habits should match the process you pick.

This article is informational: definitions, comparison, and selection. The rest will unpack how each works, where to use them, safety requirements (OSHA guidance), common mistakes, and training/certification paths (AWS D1.1). That way, the next time a repair catches you off guard, you won’t just grab any welder — you’ll know which of the three fits the job.

How All 3 Welding Types Actually Work: The Science Under the Hood

Before you choose between stick, MIG, and TIG, it helps to know that all three do the same job with the same basic physics. Strip away the gas bottles, wire feeders, and electrode holders, and every arc welding process comes down to one idea: an electric arc melts metal so two pieces can freeze together into one.

The Basic Welding Circuit

An arc welding circuit has four essential parts, as taught in standard OSHA welding and cutting guidance:

• Power source — steps down line voltage and supplies the current that feeds the arc.
• Electrode — the point where current concentrates enough to sustain the arc. It may be consumable (stick, MIG) or non-consumable (TIG).
• Work lead (ground clamp) — completes the circuit back to the power source through the workpiece.
• The arc itself — a column of ionized gas, or plasma, reaching around 10,000°F, hot enough to melt any engineering metal instantly.

When the arc strikes the base metal, it creates a small molten pool that the welder manipulates along the joint. As the arc moves on, the puddle cools and solidifies, fusing the two pieces. Reading that puddle, controlling it, and keeping it clean is the whole game in welding. Filler metal from a flux-coated rod, a spool of wire, or a hand-fed TIG rod simply adds material to that pool.

Why the Air Is Your Enemy

Here is the problem every welding process has to solve. Molten steel at 2,500°F is chemically aggressive, and the atmosphere is not friendly. Oxygen reacts with hot metal to form oxide inclusions and burn away alloying elements like manganese and silicon. Nitrogen dissolves into the puddle and, as it comes out of solution on cooling, blows gas bubbles through the solidifying metal — the defect welders call porosity. Hydrogen, carried in moisture and hydrocarbons, embrittles the joint.

An unprotected weld puddle therefore produces a gray, crusty, contaminated mess with poor mechanical properties. The fix is shielding: blanket the arc and puddle with an inert or semi-inert gas so the atmosphere never touches the melt. How each process delivers that blanket is what actually separates the three main welding types.

• Stick welding hides its shield inside the electrode. The flux coating vaporizes as the arc burns it, forming a gas cloud over the puddle and a solid slag crust on the finished bead. That is why stick needs no gas bottle — the shield and the filler arrive together on one stick of rod.
• MIG welding delivers shielding from an external bottle. Gas flows through the gun nozzle and around the continuously fed wire, protecting the puddle while the wire melts off into it.
• TIG welding also uses a gas bottle, but shields a non-consumable tungsten electrode. The arc melts the base metal while the welder hand-feeds a separate filler rod, giving independent control of heat and added metal.

How the Standards Define Welding

Terminology matters once you start reading procedure specifications. AWS A3.0M/A3.0:2025, the American Welding Society’s welding terminology standard approved by ANSI on July 30, 2024, defines over 1,500 terms in its 14th edition and sorts processes into three broad categories:

• Fusion welding — melting and joining metal liquid-to-liquid. Stick, MIG, and TIG all live here.
• Solid-state welding — joining solid-to-solid under pressure without a molten puddle, such as forge welding or friction welding.
• Brazing and soldering — allied processes that use a filler metal without melting the base metal, split by a liquidus threshold: fillers melting below 450°C (840°F) are solders, and those melting above it but below the base metal are brazing fillers.

So when people say “the three welding types,” they mean the three dominant fusion arc processes. The AWS designations you will see on procedure sheets are SMAW (shielded metal arc, i.e. stick), GMAW (gas metal arc, i.e. MIG), and GTAW (gas tungsten arc, i.e. TIG).

Constant Current vs. Constant Voltage

Under the hood, the three processes also split by power source behavior. According to Miller Electric’s welding basics guide, stick and TIG use constant-current (CC) machines: the welder sets amperage, and the machine holds it steady even as arc length changes, keeping heat input predictable for a manual puddle. MIG and flux-cored welding use constant-voltage (CV) sources: the welder sets voltage, and the machine self-regulates current, mostly through the wire itself. As the wire short-circuits and melts back, current swings and self-corrects — a big part of why MIG is so forgiving to learn.

Understand that shared machinery — circuit, puddle, shielding, power source — and the differences between stick, MIG, and TIG stop looking like three separate trades. They become three answers to one question: how do you best melt, shield, and control a puddle on this particular joint, on this particular day?

Type 1: Stick Welding (SMAW) — The Versatile Field Welder

Shielded metal arc welding (SMAW), universally called stick welding, is the process that fixed that farmer’s chopper blower band. It is the oldest of the three arc processes still in daily use, and it remains the one that shows up when the work is dirty, heavy, outdoors, or somewhere no gas bottle will fit.

How Stick Welding Works

According to OSHA’s training material, SMAW produces coalescence by heating with an electric arc between a covered metal electrode and the work-piece, with shielding from decomposition of the electrode covering. In plain terms: you strike an arc on a consumable steel rod coated in flux, both the rod and the base metal melt, and the flux does double duty.

As the flux burns, it vaporizes into a cloud of shielding gas that keeps atmospheric oxygen and nitrogen out of the puddle. When the molten metal freezes, the burnt flux hardens into a crust of slag you chisel or wire-brush off afterward. Because the shielding travels with the rod, SMAW needs no outside shielding gas and works in light to medium wind — a decisive advantage on a jobsite at the top of a tower or in a ditch in October.

Electrodes: The 6010 vs. 7018 Question

Stick electrodes carry an AWS classification code that tells you almost everything you need to know. Take E7018: the “E” means electrode, “70” means 70,000 psi tensile strength, “1” means usable in any position, and “8” identifies a low-hydrogen iron powder flux. The other rod you will meet constantly is E6010, a deep-penetrating cellulose rod that runs on direct current and cuts through rust, paint, and mill scale — the classic root-pass and pipeline rod.

• E6010: deep penetration, aggressive arc, ideal for dirty plate and open-root pipe.
• E6011: the AC-compatible cousin of 6010, great for field repair on a stick machine that only puts out alternating current.
• E7018: low hydrogen, smooth bead, high toughness — the structural steel workhorse.
• E7024: high deposition, flat-position only, for burning in fillets fast.

Moisture Control and Hydrogen Cracking

The “low hydrogen” in 7018 matters because hydrogen is the enemy of strong steel. Hydrogen-induced cracking, also called cold cracking, occurs when hydrogen diffuses into the weld metal and stresses are high. The hydrogen comes from moisture in the flux coating. Once a rod container is opened, the rods begin drinking humidity out of the air. The Fabricator recommends storing open electrodes in a heated rod oven and only holding an hour or two’s worth at the machine.

Deposition Efficiency: The Hidden Cost

Stick is cheap to buy and expensive to run. The rod is consumed, but not all of it ends up in the joint: Ohio State University Marion’s welding guide puts it plainly — 50 lb of stick electrode yields roughly 30 lb of deposited metal, versus about 49 lb from 50 lb of MIG wire. The flux turns into slag and fume. Add in stopping every time a rod burns out, and stick’s labor cost climbs even when the equipment cost is low.

Where Stick Dominates

Despite that, stick remains the default for structural erection, pipeline repair, heavy equipment maintenance, shipyard work, and farm welding. It handles thick plate — generally rated for 1/8 in. and up — tolerates wind and dirt, works in any position, and requires zero peripheral equipment. It also produces more fume than MIG or TIG, which is why ventilation planning matters more with this process.

The trade-offs are real: slag cleanup after every pass, rod changes interrupting your rhythm, spatter, and the lowest deposition rate of the three. But for a repair where the part is rusted, the wind is blowing, and the nearest extension cord is 200 feet away, nothing else competes.

Type 2: MIG Welding (GMAW) — The Fast, Beginner-Friendly Workhorse

For many welders getting their start in the trade, gas metal arc welding (GMAW), better known as MIG welding, is the first process they feel comfortable with. The name “MIG” stands for “Metal Inert Gas,” though modern mixtures often use active gases. MillerWelds notes that GMAW was developed in the late 1940s for welding aluminum and has since become the most widely used process for weld manufacturing. Its appeal lies in its simplicity: a continuous consumable wire is fed through a gun, and an external shielding gas protects the molten puddle from the atmosphere.

How MIG Welding Works

Unlike stick welding, MIG welding eliminates the need to stop and replace electrodes. The wire feeder pushes the filler metal through the welding gun, while the power source, shielding gas, and gun work in unison to create an electric arc. This arc melts both the wire and the base metal, fusing them together as they solidify. Since there is no flux coating, the external shielding gas is solely responsible for blocking oxygen and nitrogen from contaminating the weld.

The Four Transfer Modes

Not all MIG welds are created the same. The way the wire transfers into the puddle drastically changes the process’s capabilities:

• Short-circuit transfer: The wire touches the puddle and shorts, creating a small arc to melt the tip. This produces minimal heat, making it ideal for thin sheet metal and out-of-position welds.
• Globular transfer: Large droplets of molten wire fall across the arc into the puddle. It generates a lot of spatter and is best reserved for flat, heavy welds due to its lack of control.
• Spray transfer: A fine stream of tiny droplets crosses the arc, creating a stable, smooth weld. It requires higher voltage and is typically used in the flat or horizontal positions on thicker materials.
• Pulsed-spray transfer: This advanced mode pulses the current, alternating between high and low power. It mimics spray transfer with less heat, allowing for better control on thinner metals and in more positions.

Speed, Simplicity, and Cleanup

The biggest draw of MIG welding is its efficiency. Ohio State University Extension notes that MIG can weld up to four times faster than stick welding, and one wire size can cover a wide range of material thicknesses productively. With no slag to chip off after welding, cleanup is drastically reduced, greatly increasing the production factor for repetitive jobs.

These traits, paired with no need to manually feed filler or strike a flux-coated rod, are why most students find MIG to be the easiest of the three processes to learn. According to the Washington State Department of Health, GMAW also produces low-hydrogen weld deposits with all electrodes, a major benefit for minimizing certain cracking risks.

Gas Selection, Wind Sensitivity, and Limitations

Shielding gas selection is one of the most impactful decisions for a MIG welder. A 75% argon/25% CO2 mixture is a staple for mild steel, offering a clean arc with minimal spatter. For stainless steel, a tri-mix (argon, helium, CO2) is common, while pure argon is typically used for aluminum.

However, these external gases are also MIG’s greatest weakness outdoors. A light breeze can blow the shielding gas away, allowing atmospheric contamination and porosity to form. For this reason, OSHA advises caution when welding in windy conditions. MIG can also be trickier out-of-position compared to processes like stick, and it requires a wire feeder, making it far less portable than a self-contained SMAW setup.

Typical Applications

With its blend of speed and accessibility, MIG welding thrives in high-throughput environments. It is a staple for auto body repair, light manufacturing, and production lines where repeatability and efficiency are king. While it may lack the raw portability or precision of the other two processes, its output volume and beginner-friendly nature make it the true workhorse of modern fabrication shops.

Type 3: TIG Welding (GTAW) — Precision, Cleanliness, and Control

Gas tungsten arc welding (GTAW), commonly called TIG welding, is the process welders reach for when precision, cleanliness, and control matter most. Unlike MIG or stick, TIG uses a non-consumable tungsten electrode to create the arc, an inert gas shield to protect the molten puddle, and (in most cases) a hand-fed filler rod to add material. The amperage is controlled precisely by a foot pedal or sometimes a hand control, allowing the operator to raise or lower heat on the fly as the joint changes. The result is a process that produces exceptionally clean, aesthetically pleasing welds, excels on thin and non-ferrous materials, and demands the highest level of skill of the three.

How TIG Works

TIG welding relies on an electric arc between the tungsten electrode and the workpiece. Because the tungsten is non-consumable, it doesn’t melt into the weld; instead, the arc melts the base metal and, if needed, filler rod fed by the operator’s second hand. A continuous flow of inert shielding gas surrounds the arc and puddle to keep out oxygen and nitrogen, which would otherwise contaminate the weld. This shielding is what makes TIG ideal for reactive metals and for applications where even small inclusions are unacceptable.

The process was developed specifically to address welding non-ferrous metals like magnesium and aluminum, where other arc processes struggled to deliver quality results without contamination. That heritage still defines TIG today: it’s the go-to when material cleanliness and metallurgical integrity are paramount.

Clean Welds on Challenging Materials

One of TIG’s defining traits is bead appearance and quality. Compared to MIG, which tends to produce a convex ripple bead with some spatter, TIG leaves a smooth, evenly rippled bead with no spatter. That cosmetic cleanliness is valuable in industries where the weld is visible or must meet stringent surface requirements.

TIG also offers unmatched control over heat input, which is why it can weld material as thin as .010 in. with precise heat input controlled by a foot or hand amperage control. The operator can ramp heat up and down in real time, preventing burn-through on delicate sheet metal while still achieving proper fusion. This level of control makes TIG the process of choice for thin material, aluminum, stainless steel, and exotic alloys. Its ability to handle reactive and dissimilar metals cleanly has made it indispensable in fields where failure is not an option.

Speed, Skill, and Cost

The tradeoff for that precision is productivity and operator demand. TIG runs three to five times slower than MIG per inch of weld, which limits its use on long production runs. It is also rated the highest skill requirement of the three types and comes with the highest purchase and operating cost. The operator must coordinate both hands and one foot simultaneously, maintain a consistent arc length, manage filler addition, and control travel speed—all while keeping the tungsten shielded and the puddle stable.

Where TIG Shines

TIG’s capabilities make it the preferred process in applications where quality trumps speed. Typical uses include aerospace, food-grade stainless fabrication, bike frames, pipe root passes, and visible cosmetic welds. In these settings, the smooth bead, minimal spatter, and tight control over the weld pool justify the extra time and training.

MIG vs TIG vs Stick: Side-by-Side Comparison

By this point you know what each process does on its own. The harder question is the one you actually face in the shop: given this piece of metal, this joint, and this deadline, which machine do you drag out? Below is the head-to-head comparison that most welders keep taped inside a toolbox lid.

The Comparison Table

Criterion	MIG (GMAW)	TIG (GTAW)	Stick (SMAW)
How it works	Continuous consumable wire fed through a gun	Non-consumable tungsten arc with hand-fed filler rod	Consumable flux-coated stick electrode
Shielding method	External bottle of shielding gas	Inert gas (argon or argon/helium) around the tungsten	Flux coating burns off into its own shielding gas and slag
Metals & thickness	Steel, stainless, aluminum; 24 gauge and up	Steel, stainless, aluminum, exotic alloys; 22 gauge and up	Mostly carbon and stainless steel; 1/8 in. and up
Speed	Very fast	Very slow	Slow
Skill curve	Gentlest of the three	Steepest	Moderate
Purchase cost	Moderate	High	Low
Operating cost	Low	High	High
Fume generation	Low	Lowest	High
Cleanup	Minimal; light spatter	Almost none	Slag chipping on every pass
Outdoor tolerance	Poor; gas shield blows away	Poor; gas shield blows away	Excellent; unaffected by wind
Best fit	Auto body, light fabrication, production lines	Aerospace, food-grade stainless, visible cosmetic work	Structural erection, pipeline, farm and field repair

The thickness and cost rows come from the Ohio State University welding process comparison, which is a handy one-page reference if you want to print it for the shop wall. Note the pattern in the cost rows: stick is cheap to buy and expensive to run, MIG flips that tradeoff, and TIG sits high on both counts. If you weld occasionally, low purchase cost wins; if you weld daily, operating cost and speed dominate the math.

Speed, Skill, and Cost: Reading Between the Rows

Speed and skill are almost perfect inverses here. MIG and flux-cored processes are the fastest options because the wire feeds continuously and there is no slag to stop between passes, and they are also the easiest to learn. Stick is slow because you burn a rod, stop, change rods, and chip slag. TIG is the slowest of all, since one hand holds the torch, the other feeds filler, and a foot pedal meters the heat. That extra coordination is exactly why TIG has the steepest learning curve and why precision work costs more per inch of weld.

Deposition efficiency follows a similar ordering. MIG puts the highest percentage of consumed filler into the joint, because the wire melts directly into the puddle with little slag. Stick loses a meaningful share of every rod to the flux and slag crust that protects it. TIG deposits filler the slowest of the three, but what it does deposit is exceptionally clean and controllable.

Fume Production: What the Data Says

Fume is not a matter of opinion. An OSHA welding fact sheet ranks the arc processes by decreasing fume production: flux-cored arc welding first, followed by shielded metal arc (stick), then gas metal arc (MIG), with gas tungsten arc (TIG) producing the least. In plain terms, stick makes noticeably more fume than MIG, and TIG is the cleanest of the three. That ordering matters when you are choosing a process for a small shop with limited ventilation, and it is discussed further in the OSHA welding hazards guidance.

Out-of-Position Work and Outdoor Tolerance

Two rows deserve special attention because they decide real jobs. Outdoor tolerance is where stick earns its reputation: SMAW is unaffected by strong wind or air currents, and it also tolerates rust and mill scale on the base metal, while MIG and TIG must be shielded from drafts or their protective gas cloud breaks up. Take a MIG machine to a windy equipment yard and you will chase porosity all afternoon; take a stick welder and you will finish the repair.

Out-of-position capability tells a similar story. Both stick and MIG handle vertical, overhead, and overhead-on-a-ladder work well, with certain MIG transfer modes and stick electrodes designed specifically for all-position welding. TIG is far more awkward overhead, because gravity pulls the puddle and the filler rod at the same time you are trying to hold a steady arc.

None of this means one process is “best.” It means each row of the table is a constraint, and the right welder is the one who matches the constraints of the job in front of them to the process that satisfies the most of them at once.

Which Welding Type Should You Use? Matching the Process to the Job

The best welding type isn’t the one with the best specs on paper. It’s the one that fits the joint in front of you, the environment you’re standing in, and the skill you actually have today. Here’s how to make that call like a professional.

Start With the AWS Selection Criteria

The AWS Welding Handbook frames process selection around a handful of practical questions rather than brand loyalty: Is the weld fit for service under load? What does the total cost look like, including prep and cleanup? How many components are involved? What does the capital equipment cost? Where is the joint located (flat on a bench, or overhead on a tower)? How much structural mass are we moving? And honestly, what are the operator’s skill levels? Fitness for service wins every tie-breaker; everything else is a trade-off.

A Real Farm: Two Machines, Two Jobs

Consider a Wisconsin farmer whose chopper blower band split paper-thin during haylage season. He welded it back with a 200 amp MIG welder, later noting that a stick welder would have burned right through that thin steel. The same shop runs a 175 amp stick machine, but mostly for hardfacing a skid loader bucket and repairing a manure spreader, where the steel is thick, dirty, and abused. Same owner, two processes, no contradiction: MIG for thin and clean, stick for heavy and rough. His light repairs run off 115 V household current; trailer and hardfacing work calls for a 200–250 amp machine at 40–60% duty cycle. Duty cycle simply means the minutes a welder can run within a 10-minute cycle, so a 60% duty cycle at 160 amps means six minutes welding and four minutes cooling.

University-extension farm welding guidance reinforces the pattern: match the machine to the material thickness and the job location, not to what’s cheapest on sale.

Match the Scenario to the Process

• Farm and mobile repairs: MIG for thin sheet and brackets, stick for bucket hardfacing and anything outdoors where a gas bottle is a liability.
• Structural steel erection: Stick dominates. Portable, no gas bottles on the tower, excellent out-of-position performance, and it codes cleanly under AWS D1.1.
• Auto body and thin sheet: MIG with short-circuit transfer, low amperage, and careful heat control. TIG when the panel is aluminum or the repair must be invisible.
• Aluminum and stainless fabrication: TIG for control and cleanliness; MIG (spray transfer) when speed matters more than appearance, as on large aluminum weldments.
• Pipe root passes: TIG (GTAW root) for precision on the critical first pass, then stick or MIG fill and cap.
• Outdoor, windy sites: Stick first. MIG’s gas shield blows away in modest wind; flux-cored wire becomes the answer when you want wire-feed speed without the bottle.
• Hobbyist garage: A 115 V MIG unit gives the widest range of projects for the least frustration, with stick as a cheap second skill.

A Step-by-Step Selection Framework

1. Write down the joint requirements: metal type, thickness, position, load, and whether appearance matters.
2. Eliminate what can’t do it: MIG struggles in wind and on dirty heavy plate; stick struggles on paper-thin sheet; TIG struggles when speed or cost rules.
3. Check your access and equipment: Is there shop power, or only a generator? Can you carry a gas bottle to the joint?
4. Weigh cost honestly: include consumables, prep time, and cleanup, not just the machine price.
5. Assess skill: If you can’t hold a stable puddle yet, don’t pick the hardest process for a critical weld.
6. Verify code requirements: Structural, pressure, and certified work may mandate a specific process and qualified operator under AWS D1.1 or related specs.

The practical takeaway: build your capability in the order the work demands. Portable stick for the field, MIG for the bench, TIG for the jobs that have to be right and beautiful. Choose process first, settings second, and the weld will follow.

Safety and Health Across the 3 Welding Types

Welding is one of the most hazardous trades in industry, and the danger does not come from any single process. Whether you are running stick, MIG, or TIG, you are working with an electric arc that reaches several thousand degrees, intense ultraviolet light, and a chemical cocktail that did not exist in the room five minutes earlier. The good news: nearly every serious welding injury and illness traces back to a short, well-understood list of risks, and each one has a documented control.

Hazards Every Welder Shares, No Matter the Process

All three arc processes produce the same core set of hazards:

• Welding fume. The arc vaporizes base metal, filler, coating, and any paint or plating on the joint. That vapor condenses into fine particles you can inhale.
• UV and infrared radiation. The arc emits the same wavelengths as an unfiltered sun, causing arc burn (a welder’s “sunburn”) and permanent eye damage without proper filters.
• Burns. Hot metal, spatter, slag, and heated workpieces stay dangerous long after the arc stops.
• Electrical shock. Open-circuit voltages on welding machines are high enough to be lethal, especially in damp or confined conditions.
• Fire. Hot slag and spatter routinely travel 30 feet or more from the arc, igniting combustibles well outside the immediate work zone.

OSHA covers all of these under its welding, cutting, and brazing standard, 29 CFR 1910.252, with broader hazard guidance on its welding hazards and solutions page. The process you choose shifts the balance of risk. Stick produces the most fume and spatter. MIG produces moderate fume with heavy spatter in short-circuit mode. TIG is the cleanest, but on stainless and exotic alloys it trades fume volume for higher-toxicity species like hexavalent chromium.

Ventilation: The Numbers That Actually Matter

Under OSHA’s general industry standards, mechanical ventilation is required when a welder works in a space with less than 10,000 cubic feet per welder, in a room with a ceiling lower than 16 feet, or in any confined space. The minimum rate is 2,000 cubic feet per minute per welder. Where local exhaust hoods are used, the hood must pull at least 100 linear feet per minute of air velocity across the zone of welding, measured at the hood’s most remote working position.

Confined spaces add a second layer of rules. OSHA requires that confined spaces be tested for oxygen, flammable gas, and toxic contaminants before welding begins, and continuously monitored during the work. Ventilation in a confined space must never circulate fumes back toward the welder’s breathing zone.

Hexavalent Chromium, Manganese, and What Field Studies Find

Two contaminants deserve special attention. Welding stainless steel and other chromium-bearing alloys generates hexavalent chromium, a known carcinogen. OSHA’s permissible exposure limit is 5 µg/m³ as an 8-hour time-weighted average under 29 CFR 1910.1026, a limit far tighter than most welders realize. Manganese, present in steel and especially in stick electrodes, is a neurotoxin linked to manganism, a Parkinson’s-like condition.

Real-world measurements confirm the risk is not theoretical. A 2023 NIOSH Health Hazard Evaluation found manganese exposures up to 1.26 mg/m³, exceeding the NIOSH recommended exposure limit of 1.0 mg/m³, and welding noise ranging from 80.4 to 111.3 dBA across work areas, well past the 85 dBA action level where hearing conservation begins.

PPE and Helmet Shade Selection

Minimum personal protective equipment includes flame-resistant clothing, leather gloves suited to the process, safety glasses under the helmet, hearing protection, and steel-toe footwear. Helmet shade selection is process-specific: lighter for TIG, darker for stick and spray-transfer MIG, because arc brightness varies with amperage and current type. Auto-darkening helmets let you tune shade range, but they must be set correctly for the process and amperage you are actually running.

Fire Prevention Under NFPA 51B

NFPA 51B sets the baseline: remove movable fire hazards within 35 feet of the welding area, or protect them with fire-resistant covers, curtains, or shields. If neither is possible, welding shall not proceed. A fire watch with an extinguisher is required when ignitable materials cannot be moved, and should continue for at least 30 minutes after welding ends in many situations.

Treat these rules as non-negotiable, not optional. The three welding types differ in technique, speed, and cost, but they share one absolute: the process only works for you if it does not hurt you.

Common Mistakes and Troubleshooting for MIG, TIG, and Stick

Welding defects are rarely random. Almost every ugly bead, cracked joint, or rejected weld traces back to a short list of root causes: a dirty surface, a wrong setting, a bad angle, or a contaminated consumable. Reading a bad weld and naming its cause is a skill as valuable as laying a good one, because it turns a frustrating afternoon of grinding into a two-minute fix.

Use this table as a quick diagnostic starting point, then read the details below.

Defect	Typical cause	What you see	The fix
Porosity	Rust, paint, oil, moisture, or a windblown gas shield	Pinholes and bubble craters in the bead	Grind and degrease the joint; shield the gas; check flow rate
Cold lap (lack of fusion)	Amperage too low, travel too fast, wrong technique	Bead sits on top of the metal with no wetted edges	Raise heat, slow down, correct travel angle
Burn-through	Too much heat on thin material, or lingering in one spot	Holes or sagging melt-through at the joint	Reduce amperage, shorten arc, increase travel speed
Slag inclusions	Slag not cleaned Learning the 3 Welding Types: Training, Certification, and Career Path Knowing which process to pick is one thing. Actually learning all three is another. If you are standing at the start of that road, the order you learn in matters more than most beginners realize. The Learning Roadmap: Stick First, Then MIG, Then TIG Most reputable training programs start you on stick welding, and there is a practical reason for it. Stick forces you to read the puddle. The arc is exposed, the slag is covering everything you just made, and the rod is shrinking in your hand while you travel. There is no wire feeder to hide behind, so you build the fundamental instinct that everything else depends on: watching how the molten metal flows and adjusting on the fly. MIG usually comes second. Once puddle-reading is in your muscle memory, the wire welder feels fast and forgiving, and you learn what production work actually demands: consistency, joint preparation, and settings you can dial in and repeat for eight hours. TIG comes last because it asks the most of you. One hand holds the torch, the other feeds filler rod, and your foot rides the amperage pedal, all at the same time. Trying to learn TIG first is a common way to get discouraged and quit. Quick Note: If you can only afford one course before starting work, make it stick. Employers treat a solid stick foundation as proof you can actually control an arc, and the other two processes transfer from it far more easily than the reverse. How AWS Certification Actually Works Certification in welding is not a single license. The American Welding Society qualifies welders process by process, material by material, and position by position. You do not get certified in “welding” in the abstract; you qualify on a specific procedure with a specific process, and that qualification can expire if you do not use it. AWS publishes the underlying terminology in AWS A3.0, Standard Welding Terms and Definitions. For structural steel work, the document that governs nearly everything is AWS D1.1/D1.1M, Structural Welding Code—Steel. The current release, D1.1/D1.1M:2025, came out on April 17, 2025, marking the 25th edition of a code that was first published in 1928. If you are training for construction or fabrication work, expect interviews and employers to reference D1.1 directly, because it defines the welder qualification tests you will take. What Employers Ask For in Job Postings An AWS analysis of welding job postings found the demand splits like this: 35% welder/fabricator roles 18% ironworkers 17% pipefitters 6% shipfitters 5% welding inspectors Notice what that means in practice: two out of every three openings are for welder/fabricator or ironworker positions, jobs where stick and MIG competence carry the day. The postings rarely say “certified welder” and stop there. They name a process, a position, and a code, such as 2G or 3G pipe with 7018 rods. Reading postings in your target industry before you enroll tells you exactly which qualification to chase first. Training pathways are also shorter than many people assume. Per AWS workforce data, they range from a 6- to 18-month welding certificate to a two-year associate degree. The certificate gets you employable faster; the associate degree typically adds blueprint reading, metallurgy, inspection fundamentals, and management coursework that helps later when you want to move into supervision or inspection. Demand and Wages: Is the Career There? The workforce numbers are strong. WeldingWorkforceData.com projects 320,500 new welding professionals needed in the U.S. by 2029, averaging about 80,000 openings annually between 2025 and 2029. The U.S. Bureau of Labor Statistics projects 2% employment growth for welders from 2025 to 2035, with roughly 40,300 openings per year driven mostly by retirements and workers moving into other occupations. Those two figures look contradictory until you read them together. Growth is modest, but the replacement demand is not. The experienced generation is leaving faster than the field is expanding, which is exactly why employers keep posting openings even in slow construction years. Conclusion: The One Decision Rule Three welding types, three very different jobs. Stick (SMAW) is the field workhorse that goes anywhere a bottle cannot. MIG (GMAW) is the fast, forgiving production process that turns beginners into useful welders quickly. TIG (GTAw) is the precision tool for thin, exotic, and visible work where the weld is the product. If you remember one rule from this entire guide, make it this: choose by the conditions and the joint, not by what looks impressive. Windy job site or dirty steel, grab a stick rod. Repetitive fabrication on clean material, pull the MIG trigger. Thin aluminum, stainless, or a weld someone will actually look at, set up the TIG. Match the process to the job and the rest of the decision takes care of itself. Frequently Asked Questions What are the 3 main welding types? The three main welding types are stick welding (SMAW), MIG welding (GMAW), and TIG welding (GTAW). All three are arc welding processes that melt base metal to form a joint, but they differ in how the weld pool is shielded from the air and how filler metal is delivered. Which welding type should a beginner learn first? Most training programs teach stick welding first because it builds puddle-reading instinct, then MIG for production speed, then TIG for precision. If your goal is quick early success on steel fabrication projects, start with MIG; if you want a foundational skill that transfers everywhere, start with stick. Which welding type is the strongest? Joint strength depends more on procedure, penetration, and welder skill than on the process name. When done correctly to an approved welding procedure, all three types can produce full-penetration welds that meet code requirements such as AWS D1.1. Which is easier: MIG, TIG, or stick? MIG is generally the easiest of the three to learn because the wire feeds continuously and there is no slag to chip. TIG is the most demanding, since both hands and one foot work at the same time to control the arc, filler rod, and travel. Can all three welding types weld the same metals? They overlap but are not interchangeable. Stick and MIG handle most steels well, while TIG covers the widest range including aluminum, stainless, and exotic alloys, and is the go-to for thin material and visible cosmetic welds. Which welding type works best outdoors in the wind? Stick welding performs best outdoors because its flux coating generates its own shielding gas, so wind has little effect. MIG and TIG rely on an external gas shield that drafts can blow away, and self-shielded flux-cored wire is the usual alternative for windy field work. What are the main safety risks of the 3 welding types? All three produce ultraviolet radiation, burns, electrical shock, fire risk, and metal fumes. Fume production runs highest for flux-cored and stick, moderate for MIG, and lowest for TIG, but OSHA still requires adequate ventilation and PPE for every process. How much does welding equipment for each type cost? Stick has the lowest purchase cost because it needs no gas bottle or wire feeder, MIG is moderate, and TIG is the most expensive to buy and to operate. Operating costs reverse the picture: MIG is relatively cheap per pound of deposited metal, while stick electrode deposition efficiency is much lower. TOPICS: TIG Welding Procedure Inspection NH Nicholas Harper Editorial Team Covering welding processes, equipment selection, and shop-floor practice for WeldZen — with every claim checked against the governing code. 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