A weekend DIYer buys a cheap flux-core welder at a hardware store, stitches a trailer hitch back together with ugly-but-strong beads, and proudly drives off—until the joint cracks a month later because nobody told him flux-core was the wrong process for that thin, dirty steel. Choosing among the four main types of welding isn’t about which machine is ‘best’; it’s about matching the process to the metal, the conditions, and the code.
A weekend DIYer buys a cheap flux-core welder at a hardware store, stitches a trailer hitch back together with ugly-but-strong beads, and proudly drives off. A month later the joint cracks, because nobody told him flux-core was the wrong choice for thin, dirty steel. Choosing among the four main types of welding isn’t about which machine is “best.” It’s about matching the process to the metal, the conditions, and the code.
That’s the gap this guide fills. If you’ve typed “four types of welding” into a search bar, you probably don’t want a textbook. You want a plain-English map: what MIG, TIG, stick, and flux-core actually are, what each one is good at, and which one belongs in your garage or on your jobsite.
Here’s the surprise for most beginners: welding isn’t four processes. Standard industry references recognize more than 30 distinct arc and fusion processes. Plasma arc, submerged arc, electron beam, laser beam, resistance spot welding, and oxy-fuel cutting and welding all exist, and all of them matter somewhere in manufacturing.
But walk into a typical fabrication shop, a pipeline spread, or a farm repair bay and you’ll see the same four arc processes again and again. Industry references such as Earlbeck’s types of welding overview make the point plainly: for everyday manual fabrication and repair, the vast majority of arc welding work runs through stick, MIG, TIG, and flux-core. The exotic processes are real, but they’re often automated, expensive, and tied to specific factory settings, like the rail industry’s thermite welding for rail joining.
So when someone asks which welding type to learn, they’re really asking which of these four fits the job.
Strip away the branding and every one of these processes works the same way at its core:
If you’re new to the vocabulary, terms like base metal, weld pool, slag, penetration, and deposition rate will appear in almost every article you read. The Miller welding glossary of common terms is a solid companion. Our own breakdown of what electrodes are in welding covers the consumables side in more detail.
Every difference you’ll ever notice between these four processes traces back to two design choices:
Change those two variables and everything downstream changes with them: travel speed, cleanliness, portability, consumable cost, and which metals you can safely touch.
Quick Note: AWS shorthand you’ll see on machine faceplates and in procedure specs — SMAW = stick, GMAW = MIG, GTAW = TIG, FCAW = flux-core. The letters stand for Shielded Metal Arc, Gas Metal Arc, Gas Tungsten Arc, and Flux-Cored Arc welding.
Worth knowing: the U.S. Bureau of Labor Statistics counted 437,700 welders, cutters, solderers, and brazers in 2025, with median pay of $53,750 per year ($25.84 an hour). The BLS projects roughly 40,300 openings each year on average through 2035, largely driven by retirements and career transfers.
Those numbers mean something practical. Knowing which process fits which job isn’t trivia you forget after a weekend project. It’s the difference between a repair that holds and one that fails, and it’s exactly the kind of marketable skill employers hire for.
With the foundation set, let’s look at each of the four in detail, starting with the process almost every welder learns first and complains about longest.
Before we split into MIG, TIG, stick and flux-core, it pays to lay the shared foundation first. All four are electric arc processes that fight the same two enemies: a broken circuit and open air. Once you understand how the loop closes, why the atmosphere wrecks a weld pool, and what terms like penetration and heat input actually mean, everything that follows reads more easily. The glossary at the end of this section lines up with Miller Welds’ beginner terminology guide.
Every arc weld runs through one complete loop: the power source pushes current down the electrode cable, across the gap, into the workpiece, back through the ground clamp and return lead, and home to the machine. Break it anywhere — a loose clamp, a corroded lug, a frayed cable — and you don’t get a clean arc, you get sputter, stutter and wasted filler. Even welding cable connectors matter: loose hardware robs your machine of amps before the arc ever forms.
The arc itself is a stream of ionized gas, or plasma, bridging electrode and workpiece. Arc voltage typically sits somewhere around 10 to 50 volts, while amperage might be 30–40 A on delicate sheet or several hundred amps on heavy plate. Current, not voltage, decides how much metal melts and how deep it fuses — worth remembering before you touch a single setting dial.
Quick Note: An arc isn’t the only way to fuse steel. Railroad tracks are joined by a superheated chemical reaction that needs no electricity at all — our guide to railroad thermite welding shows how aluminothermic rail joining works.
This is where beginners get tripped up. Stick and TIG run on constant-current (CC) power sources because you control arc length by hand: stretch or shorten the arc, and the machine holds amperage steady so heat stays predictable. MIG and flux-core run on constant-voltage (CV) instead. With CV, when the wire feeds faster or the arc shortens, current rises automatically and melts more wire, pulling the arc back to length. It’s a self-regulating loop — which is why MIG feels so forgiving once you pull the trigger.
Polarity, meaning the direction current flows, matters just as much. Most MIG runs on DCEP, stick electrodes like E7018 usually run DCEP, and self-shielded flux-core wire is designed for DCEN. Get it backwards and the arc simply won’t behave. Our guide to welding electrodes explains the numbering system, the 3/32 E7018 amperage and polarity guide shows those settings in practice, and a full MIG welder setup walkthrough covers the pre-arc checklist.
Molten metal is hungry. At weld-pool temperature, steel absorbs oxygen and nitrogen from the air almost instantly, producing trapped gas bubbles (porosity), brittle oxide inclusions, and a joint that looks acceptable until it fails under load. That’s why all four processes work hard to keep air off the puddle: an external shielding gas, a flux coating that burns into a protective blanket, or the slag crust that freezes over the bead. OSHA’s welding hazards guidance explains what the arc does to the surrounding air as well as the metal.
The fumes deserve the same respect. MSHA notes that welding fume particles are generally one micron or smaller and behave much like gases, spreading widely instead of settling nearby. Ventilation isn’t optional, and neither is a complete welding PPE setup — OSHA’s welding fact sheet lists helmet, clothing and respiratory protection as baseline controls.
Articles, welding procedure specs and shop talk all assume you already know these words. In plain English:
| Term | Plain-English meaning |
|---|---|
| Base metal | The pieces you’re joining; everything else is added to them. |
| Filler metal | Wire, rod or electrode melted into the joint. |
| Weld pool | The small dish of molten metal you steer, often called the puddle. |
| Electrode | Whatever carries current to the arc: a stick rod, MIG wire or tungsten. |
| Consumable | An electrode that melts and becomes part of the weld. |
| Shielding gas | Argon, CO₂ or a mix that blankets the pool from air. |
| Slag | The hardened flux crust over stick and flux-core beads, chipped off between passes. |
| Porosity | Gas bubbles trapped in solidified metal; the classic contamination defect. |
| Heat input | Total energy pumped into the joint; drives distortion, hardness and toughness. |
| Penetration | How deeply the weld fuses below the surface. |
| Deposition rate | How much filler metal you stack per hour. |
Short Note: Stick, MIG and flux-core all consume their electrode — the rod or wire literally becomes part of the weld. TIG is the exception: its tungsten only carries the arc and does not melt, so the filler is added separately by hand.
With these shared mechanics down, the four process sections ahead become a straightforward comparison instead of a wall of jargon.
Stick welding is shielded metal arc welding (SMAW), the oldest and most established manual arc process still in daily use. Call a welder to a muddy jobsite, a broken farm implement, or a pipeline right-of-way with no power and no gas bottle in sight, and this is the process they’ll bring. Stick’s enduring trick is elegant: filler metal, shielding gas, and slag protection are all packed into a single consumable rod. Clamp the ground, strike an arc, and you can weld anywhere.
A stick electrode is a length of filler wire coated in a chemical flux. The welder grips it in a spring-loaded stinger, and the machine pushes current through it into the workpiece. When the rod touches the metal and is pulled back slightly, an electric arc forms—the same plasma arc described in the previous section—and the tip of the rod melts off into the weld pool.
At the same time, that flux coating does three jobs. Part vaporizes into a shielding gas cloud that keeps oxygen and nitrogen out of the molten pool. Another part forms a layer of slag that sits on the finished bead and protects it while it solidifies. The rest deoxidizes and refines the metal. That built-in self-sufficiency is why stick has no gas bottle, no wire feeder, and no fragile consumables to snag on a scaffold.
Quick Note: Stick electrodes are typically about 14 inches long, so every time one burns down you stop, toss the hot stub, and clamp a fresh rod. The National Board points to that constant restarting as a real source of arc downtime and stub loss, which is why stick runs slower than wire-fed processes on long, continuous work.
That combination is why stick still rules construction, structural steel, pipeline, shipyard repair, and general maintenance. Most code work still flows through documented Pipe Welding Procedures built around SMAW and its close cousins.
The trade-offs are real. Deposition is slow compared to wire processes, every rod change costs seconds of arc time, and the last inch of each electrode becomes an unusable stub. Expect more spatter and more chipping and grinding cleanup than MIG. Stick is also genuinely hard on thin sheet: the concentrated arc and high amperage options make blow-through a constant risk below about 18 gauge. It can be done—experienced welders run 6013s on thin steel—but it is never the first choice. For details, read Stick Welding Sheet Metal: Amperage, Rod Choice, and Blow-Through Prevention.
Quality can also be less consistent than TIG’s. The flux system that makes stick so tough outdoors can leave coarser grain structure and occasional micro-inclusions, which matters in critical service. Stick demands a skilled hand, tight arc length control, and clean technique. For an honest assessment of the learning curve, start with Is Stick Welding Hard? An Honest Beginner’s Guide.
Every AWS-classified rod carries a code telling you tensile strength, welding positions, and current type. The full breakdown lives in What Are Electrodes in Welding? Types, Numbers, Polarity & How to Choose, but here’s the working shorthand:
| Rod | What it does well | Best for |
|---|---|---|
| 6010 | Deep, aggressive penetration; fast-freezing arc; DC only | Root passes, pipe, dirty or rusty steel |
| 6011 | 6010 performance but on AC, so it runs on old AC buzz boxes | Field repair, farm work, AC machines |
| 6013 | Soft arc, low penetration, smooth bead, forgiving to beginners | Thin steel, sheet metal, light repairs |
| 7018 | Low-hydrogen coating, excellent toughness, X-ray quality beads | Structural steel, code work, anything inspected |
The first two digits (60 or 70) give minimum tensile strength in thousands of psi. The third digit is position: 1 means all-position, 2 means flat and horizontal only. The final digit identifies coating and current. Settings matter most on 7018, where correct amperage and polarity separate a buttery bead from a slag-trapped mess—use our guides to 3/32 E7018 amperage and polarity and 5/32 E7018 settings and technique. Travel angle matters too, and the push-versus-drag question is answered in Push or Pull Stick Welding: Which Technique Is Right and Why.
Short Note: There’s an old joke that every welder learns stick first and complains about it longest. There’s truth in it—stick is the hardest of the four to make pretty. But learn it well and every other process becomes easier, because stick forces you to read the puddle, control arc length, and understand what heat actually does to metal.
If stick welding is the skill test, MIG is the point-and-shoot camera. Nearly everyone who walks into a shop for the first time gets handed a MIG gun before anything else, and there is a good reason: gas metal arc welding (GMAW) has the shortest learning curve of the four processes. You pull a trigger, the wire feeds itself, the gas shields itself, and within an hour you are laying beads that look like beads. That friendliness is why industry training references routinely call MIG the most common process in manufacturing.
The whole system is elegantly simple. A spool of solid, thin wire sits inside the machine. When you press the gun trigger, two drive rolls push the wire through a liner, out the contact tip, and into the joint. Arc current passes through that wire, the arc melts the wire’s tip into the puddle, and the wire becomes both the electrode that carries the current and the filler metal that fills the joint. At the same moment, shielding gas flows from a cylinder through the same gun, blanketing the molten pool so atmospheric oxygen and nitrogen cannot contaminate it.
For carbon steel, shops almost universally run one of three gases: pure CO2 (cheap, deeper penetration, more spatter), pure argon (used for non-ferrous metals), or the industry standard 75% argon / 25% CO2 mix, affectionately called C25, which gives a smooth arc with very little spatter on steel. Most MIG also runs on DCEP polarity, which gives good penetration. If you have just bought a machine, our How to Set Up a MIG Welder walkthrough covers gas, wire, and settings in order.
MIG is not one arc behavior; it has four, and choosing the right one is most of the skill. The four metal transfer modes are short-circuiting, globular, spray, and pulsed.
| Mode | How it behaves | Best used for |
|---|---|---|
| Short-circuit | Wire touches the work and shorts 20–200 times per second, melting off in tiny bursts | Thin sheet, out-of-position work, galvanized steel, beginners |
| Globular | Large globs of molten transfer at higher voltage; somewhat spattery | Thicker steel in flat and horizontal positions, when cheap CO2 is used |
| Spray | A fine, continuous stream of droplets; quiet, silky, high heat | Thick material, flat/horizontal only, argon-rich gas, fast fill |
| Pulsed | Current pulses between a peak and a background level, releasing one droplet per pulse | All-position welding of thicker sections with spray-like quality and less heat |
The external gas bottle is both MIG’s advantage and its curse. Even a light breeze blows the shield away from the puddle, so outdoors you need a windscreen, a tent, or a different process entirely. The cylinder also makes the rig less portable than a stick machine you can throw in a truck bed. MIG is also fussy about surface condition: mill scale, rust, oil, and paint cause porosity, so the joint has to be ground clean first. Finally, the common wire diameters, 0.023 to 0.030 inch, are not gap fillers. If your fit-up has a wide gap, thin wire will fall through rather than bridge it, which is why structural gaps belong to flux-core or stick.
Quick Note: MIG dominates auto body work, sheet-metal manufacturing, and general fabrication shops because those shops run indoors, weld mostly clean steel, and care about cycle time more than anything else. If your garage project looks like a car part or a steel bracket, MIG is probably the answer. And whatever process you run, the arc’s ultraviolet output still burns skin and eyes, so review what welders wear before you strike your first arc.
For a deeper look at dialing in voltage and wire-feed speed for each transfer mode, Miller’s welding terminology guide is a solid companion reference.
If stick welding is the sledgehammer of the arc processes, gas tungsten arc welding (GTAW), better known as TIG, is the scalpel. The American Welding Society calls it GTAW; most fabricators and hobbyists say TIG. Either way, this is the process that produces the highest-quality, cleanest, most controllable welds of any manual welding method — and the one that demands the most from the person holding the torch.
Everything about TIG starts with one unusual feature: the electrode doesn’t melt. GTAW uses a non-consumable tungsten electrode — tungsten being one of the few metals that stays solid at welding temperatures — purely to carry current and sustain the arc. As Miller’s welding terminology guide puts it, that tungsten should not become part of the completed weld. It just sits there, glowing, doing its job pass after pass.
Shielding comes from an inert gas — usually 100% argon — fed through the torch nozzle and flowing over the weld pool to keep oxygen and nitrogen out. For heavier aluminum sections, welders switch to argon/helium mixes, which add arc heat and penetration. Because the tungsten adds nothing to the joint, filler metal is a separate decision: the operator dips a hand-fed filler rod into the puddle with the off hand, or runs “autogenous” — fusion only, no filler at all — on a perfectly fitted joint.
That’s why TIG looks so hard from the outside. One hand aims the torch, the other feeds rod, and the right foot works a rheostat pedal that varies amperage in real time, the way a car’s gas pedal varies throttle. No other manual process gives you that kind of moment-to-moment heat control. Dial the pedal back as you approach a corner and you can sit on a thin edge indefinitely without blowing through.
Quick Note — AC vs DC: Polarity matters more in TIG than anywhere else. Steel, stainless, and copper run on DCEN (electrode negative) for deep, stable penetration. Aluminum normally runs on AC, because the alternating current alternately cleans and penetrates — the “cleaning” half of the cycle blasts apart aluminum’s stubborn surface oxide layer, which melts at roughly 3,700°F while the aluminum beneath melts at about 1,220°F. DC can’t break that oxide; AC does it every half cycle.
TIG’s strengths all flow from control:
The trade-offs are real:
Welders switching from stick often ask which electrode settings carry over — the honest answer is none directly. TIG has no consumable electrode to classify, so numbers like E7018 are meaningless here. If you’re still learning rod-side basics, start with What Are Electrodes in Welding? Types, Numbers, Polarity & How to Choose.
Note: TIG demands more safety discipline than it appears to. The arc’s concentrated UV output burns skin and eyes fast, and the tungsten-grinding dust, plus fumes from stainless or coated metals, call for proper ventilation, screens, and gloves — our Complete Welding PPE Guide lays out the full kit. OSHA’s welding, cutting, and brazing hazards guidance covers the fume and ventilation requirements that apply no matter how clean the process looks.
The short version: choose TIG when the joint has to be beautiful, sound, and metallurgically clean — and accept that you’ll pay for that quality in time, prep, and practice.
When the job site isn’t a climate-controlled shop, time is money, and the steel isn’t showroom clean, flux-cored arc welding (FCAW) is the process that gets it done. Known under its AWS classification FCAW, this arc process trades the spotless look of TIG for raw speed and tolerance. It’s a favorite for everything from structural steel to shipbuilding, but it comes with its own set of tradeoffs that every welder should know.
At its core, FCAW is very similar to MIG welding in one way: a continuously fed, consumable wire is pushed through a welding gun. The difference is what’s inside that wire. Instead of being solid, FCAW wire is a thin metal tube filled with flux. When the arc melts the wire, the flux vaporizes to create a shielding gas and forms a layer of slag over the molten weld pool to protect it from atmospheric contamination.
This leads to the two main variants:
Quick Note: Choosing between the two often comes down to location. If you’re working in a shop bay, dual-shield is hard to beat. If you’re working on a windy job site, self-shielded FCAW will save you a massive headache.
The biggest selling point for FCAW is speed. OSHA’s welding guidance notes the productivity of flux-cored processes, and industry data reflects this: gas-shielded FCAW produces the highest deposition rates of all-position processes—up to about 10 lb per hour welding vertically. This is a game changer for heavy fabrication, pipe welding, structural steel, and shipbuilding where pounds of weld metal per hour directly translate to saved labor.
Beyond speed, FCAW is incredibly forgiving. The deoxidizers packed into the flux allow it to tolerate dirty, rusty, or lightly painted metal, cutting down on the intensive prep work that a process like TIG demands. Self-shielded wires shrug off wind with ease, and the process can lay down strong, reliable beads in out-of-position joints, especially when paired with the right technique outlined in our flux-core wire welding tips.
With that muscle comes some baggage. For starters, FCAW produces significantly more smoke than MIG, requiring increased ventilation indoors. OSHA’s welding fume controls and NIOSH guidance both stress proper exhaust, especially in enclosed spaces. Along with smoke comes more spatter, so don’t skip your full welding PPE for these jobs.
Heat is the other major limiter. Due to its high heat input, FCAW generally is not recommended for material thinner than about 20 gauge. Try to run it on sheet metal and you’re far more likely to warp or blow through, which is why many welders opt for MIG or TIG on thinner stock. Lastly, the slag that shields your puddle must be chipped and brushed between passes, adding cleanup time that a solid-wire MIG process simply doesn’t have.
This is exactly why many fabrication shops run both MIG and FCAW, and switch between them by joint type. For thick, structural members in a windy yard, dual-shield or self-shielded FCAW will outproduce almost anything else. For auto body panels, thin stainless, or visible cosmetic welds, you’ll be better served by MIG or TIG. For portable repair work, self-shielded FCAW can be just as go-anywhere as stick welding, but with far less downtime changing rods.
Note: If you’re looking for a do-it-all machine for your shop, a MIG/TIG combo is great, but for raw field productivity, a dedicated FCAW setup is hard to top.
You’ve met all four processes individually. Now the real question: side by side, which one wins? None of them do. Each trades something away, and the craft is knowing what you give up before you strike an arc.
| Criteria | MIG (GMAW) | TIG (GTAW) | Stick (SMAW) | Flux-Core (FCAW) |
|---|---|---|---|---|
| Shielding method | Gas bottle: argon/CO₂ or 75/25 mix | Inert gas, usually argon | Flux coating burns into shielding gas | Flux inside the wire; self-shielded or gas-assisted |
| Electrode | Continuous solid wire (consumable) | Non-melting tungsten, filler added by hand | Flux-coated consumable stick | Tubular consumable wire |
| Ease of learning | Easiest | Hardest, highest skill floor | Moderate, frustrating at first | Moderate |
| Weld quality & appearance | Clean, tidy, consistent | Best of any manual process | Strong but rougher-looking | Strong, heavier ripples |
| Speed & deposition | Fast, continuous | Slowest of the four | Slow, rod changes break rhythm | Highest deposition |
| Thickness range | 26 gauge to ½ in and up | Thin sheet through moderate plate | 18 gauge and heavier | 20 gauge and heavier |
| Materials | Carbon steel, stainless, aluminum, copper | Steel, stainless, aluminum, magnesium, titanium, copper alloys | Carbon and low-alloy steel | Steel and heavy structural grades |
| Outdoors / wind | Poor, shield blows away | Poor, shield blows away | Excellent | Good with self-shielded wire |
| Cleanup & slag | Little slag, minimal cleanup | Little or no slag | Full slag, chipping required | Slag removed between passes |
| Equipment cost | Low to mid | Highest | Lowest | Low to mid |
| Operating cost | Low, wire plus gas | Argon, tungsten and rod | Cheap rods, some stub loss | Wire, plus gas for dual-shield |
| Typical industries | Auto body, manufacturing, fab shops | Aerospace, sanitary tubing, art, pressure work | Construction, pipeline, structural, maintenance | Shipbuilding, heavy structural, steel erection |
The pattern worth memorizing is simple: MIG and TIG shield with gas from an outside bottle and leave little or no slag, while stick and flux-core carry shielding inside the electrode’s flux and bury the bead in slag you chip away.
Think of every weld inside a triangle with speed, quality, and cost at the corners: push one and another moves away. TIG gives show-quality welds but bills the slowest hour of any manual process. Flux-core fills a joint faster than anything else but leaves more smoke, spatter, and grinding. Stick is the cheapest rig to carry into a field, yet demands rod changes and cleanup. MIG sits in the middle, which is why it dominates shops turning twenty identical parts before lunch.
No process wins all three corners. The only real question is which corner your project cannot compromise on.
Quick Note: Welding quality matters most where codes apply. The National Board notes that boiler and pressure vessel fabrication commonly calls on five arc processes — SMAW, SAW, FCAW, GMAW, and GTAW — so the process you choose may be dictated by a written procedure, not by preference. Our Pipe Welding Procedures guide covers WPS, positions, passes, and inspection.
A thin stainless handrail. TIG wins, no contest: tight heat control on thin tubing, a clean oxide-free bead, and a finish the client will run a hand along. Settings are covered in The Complete Guide to TIG Welding Sheet Metal.
Repairing a farm implement in a windy field. Stick or self-shielded flux-core: both keep their shielding with them instead of trusting a gas bottle the breeze will rob. That’s why stick welding still owns field repair a century after it was invented.
Batch-producing steel brackets in a shop. MIG: continuous wire feed, no rod changes, light cleanup, and a short learning curve so a newer operator hits rate fast. Get setup right with How to Set Up a MIG Welder.
Fabricating heavy structural members. Dual-shield flux-core: the highest deposition of the four, thick steel and out-of-position work, and external gas for better beads than self-shielded wire. Tune it with our flux-core wire welding tips.
The four arc processes cover the overwhelming majority of manual work, but they don’t cover everything. Submerged arc welding buries the arc under granular flux for flat plate and heavy beams. Spot and projection welding join sheet metal by resistance in milliseconds. Laser and hybrid laser-arc processes run automotive body lines at speeds no hand operator can approach. Even railroad thermite welding sits outside the arc family entirely. Knowing the four gets you through nearly every shop conversation; knowing the others exist stops you assuming a hammer solves every fastener problem.
Bottom line: match the process to the metal, the conditions, and the code. The next section turns this into a decision you can make in about a minute.
Comparison tables are satisfying to read, but they rarely pick a process for you. When you are standing in the shop with a piece of steel and a deadline, the decision usually collapses into a handful of practical questions. Answer these five in order and the right process usually reveals itself before you have finished the list.
Once those questions are answered, the patterns are remarkably consistent:
| Situation | Best fit | Why |
|---|---|---|
| Thin sheet, auto body, general fabrication | MIG | Forgiving, fast, clean, easy to restart |
| Aluminum of any thickness | TIG (or spool-gun MIG above ~1/8 in) | AC TIG breaks oxide and gives control |
| Heavy structural members in a shop | Dual-shield flux-core | High deposition, good penetration, tolerates fit-up |
| Field repair on rusty or imperfect metal | Stick | No gas bottle, tolerates dirt and wind |
| Precision, art, sanitary, appearance-critical | TIG | Best-looking, most controllable manual bead |
Quick Note: If your project is a thin stainless handrail or decorative piece, start with The Complete Guide to TIG Welding Sheet Metal. If you are repairing a worn implement in a windy field, Is Stick Welding Hard? gives you a realistic picture of the learning curve before you commit.
Equipment cost falls into a clear hierarchy. Entry-level MIG and flux-core machines are the cheapest way to lay a usable bead, and consumables are inexpensive: solid wire, a bottle of gas, and contact tips. TIG setups cost the most and then keep charging you, because TIG demands precise settings, premium consumables, and above all practice time. Stick sits in between, with cheap machines and cheap electrodes, though rod selection becomes its own skill once you move past general-purpose 6013 and into 7018 structural work.
For a fuller walkthrough on gas, wire, and settings, see How to Set Up a MIG Welder, and for process-specific bead technique, Flux Core Wire Welding Tips.
Note: Most hobbyists and small shops start with a single multi-process unit that runs MIG, TIG, and stick. You give up the peak performance of a dedicated machine, but you get to experiment with all three before deciding where to invest. A detailed look is in our guide to MIG/TIG combo welders.
Finally, budget for training, not just tools. The Bureau of Labor Statistics notes that welders typically need a high school diploma plus technical training and moderate-term on-the-job instruction, which is exactly why a community-college course pays for itself faster than another accessory does. Choose the process that fits the metal, the location, and the standard you owe the person who will load that weld.
MIG, TIG, stick, and flux-core differ in many ways, but they share one truth: the arc that fuses metal also throws off fine particles, invisible gases, and intense radiation. The weld may hold for decades. Lung damage can show up far sooner.
OSHA is blunt about it: welding fume can contain aluminum, arsenic, cadmium, chromium, manganese, nickel, lead, and zinc, while the gases given off include carbon monoxide, nitrogen oxides, and ozone. Your base metal, filler, coating, and shielding system decide exactly what you breathe.
NIOSH classifies welding fume as a potential occupational carcinogen linked to lung cancer. That alone should end the “just crack a garage door” approach.
Carbon monoxide, nitrogen oxides, and ozone form during the arc and can’t be seen. Ozone and nitrogen oxides build up fastest in inert-gas processes, because the arc’s high UV energy splits the air itself.
The most dangerous gas, though, comes from what’s sitting in your shop rather than the welder. Chlorinated solvents like brake cleaner and some degreasers break down under UV into phosgene and hydrogen chloride, agents nasty enough to be classified as chemical warfare. That is why chlorinated solvents must stay at least 200 feet from the arc unless properly shielded.
Quick Note: Never spray a chlorinated cleaner over an area you’re about to weld. Residue plus arc equals phosgene. Use acetone or a dedicated pre-weld cleaner instead. Working on live fuel or gas lines adds purging and isolation rules that are worth reading before you strike an arc, so see our guide to gas line welding codes, safety, and purging rules.
Short-term exposure to zinc or cadmium fume causes metal fume fever: flu-like aches, chills, and a metallic taste that fades in a day or two. The long game is worse. Welders face higher rates of lung, laryngeal, and urinary tract cancer, and manganese exposure can produce Parkinson’s-like neurological symptoms that never fully reverse. Hexavalent chromium is a known carcinogen, and OSHA sets a permissible exposure limit of 5 µg/m³ as an 8-hour time-weighted average under 29 CFR 1910.1026 and 1926.1126.
The arc emits ultraviolet radiation that burns skin in minutes and can injure eyes after a single unprotected glance. Under OSHA 1926.353, inert-gas metal-arc (MIG) welding produces UV radiation 5 to 30 times that of shielded metal-arc (stick) welding. Practically, that means the lightly tinted welding curtains you use around a stick booth are not adequate around a MIG or TIG station.
Your controls: a properly shaded auto-darkening helmet, screens protecting everyone nearby, leather gloves and jacket with no exposed skin, and a respirator where the metal or process demands it. Our complete welding PPE guide breaks down what to wear and why. Burns still happen quickly, and weld burns on arms covers first aid and prevention in detail.
OSHA’s ventilation rules live largely in 1926.353, which requires mechanical ventilation or supplied-air respirators in confined or restricted spaces and adequate local exhaust elsewhere. A cheap box fan pushing fume around the shop isn’t ventilation, it’s circulation. You want capture right at the arc.
The process changes which controls matter:
Confined spaces raise the stakes again. Argon and carbon dioxide are heavier than air and displace oxygen silently, so asphyxiation rather than fume becomes the immediate killer. Test the atmosphere, ventilate mechanically, and never weld alone inside a tank, vessel, or pit.
Note: Clean metal fuses better than coated metal. For thin material where fume control is trickiest, our TIG vs MIG sheet metal guide explains why cleaner joint prep means a calmer arc.
Bottom line: choose the process for the job, then match ventilation, shielding, and PPE to that process. The two decisions are linked, and treating safety as an afterthought is the one mistake that outlives a bad weld.
Almost every bad weld comes down to a choice made before the arc was struck: wrong process, wrong settings, wrong prep. Here are the nine errors that burn through beginners most often, and the fix for each.
Quick Note: Most blown-through holes, cracked beads, and burnt fingers trace back to items 3, 4, and 9. Fix your prep, your polarity, and your PPE before you touch a single dial.
Start by burning coupons: scrap plate cut into practice pieces, running beads, cutting them out, and doing it again. Learn to read the puddle, because every setting in the book matters less than what the molten pool is telling you. When self-study stalls, a community-college or vocational welding course gives you structured practice, an instructor who can correct your arc length in real time, and shop time you cannot replicate at home. Employers commonly ask for a high school diploma plus technical or vocational training, and apprenticeship remains the classic entry route, according to the U.S. Bureau of Labor Statistics.
Then get credentials. An AWS Certified Welder credential or an entry-level employer certification proves you can put down a code-quality bead on demand. Where the money is lies in structural and pipe qualifications: specialty trade contractors averaged $59,440 in May 2025, and repair and maintenance shops $56,080, against $51,210 in manufacturing. The bottom 10% earned under $39,240 while the top 10% cleared $77,530. Expect real working conditions: outdoors in all weather, in confined spaces, or on scaffolding high off the ground. If pipe interests you, our pipe welding procedures guide explains WPS paperwork, positions, and passes; if stick still intimidates you, start with is stick welding hard?
Choosing among the four arc processes is not about finding the best welder; it is about matching the process to the metal, the conditions, and the code. Get that order right and the machine, settings, and technique fall into place behind it. Once you have a process selected, go deeper with our TIG sheet metal guide and our travel angle guide, and you will be fixing other people’s mistakes before long.
The four main types are MIG (gas metal arc welding, GMAW), TIG (gas tungsten arc welding, GTAW), stick (shielded metal arc welding, SMAW), and flux-core (flux-cored arc welding, FCAW). All four are arc welding processes that use an electric arc to melt metal, but they differ in how filler metal is delivered and how the weld pool is shielded from the atmosphere.
MIG welding is generally the best starting point because the machine feeds the wire for you, the learning curve is short, and cleanup is minimal. Many beginners start on a multi-process machine so they can also try flux-core without gas and stick welding.
Both use a continuously fed wire through a welding gun, but MIG uses solid wire plus an external shielding gas, while flux-core uses a hollow wire filled with flux that creates its own shielding. Flux-core handles dirtier metal and outdoor wind better, but it produces more smoke, more spatter, and slag that must be chipped off.
Yes—TIG is the preferred process for aluminum because it gives precise heat control and very clean welds. Aluminum TIG welding normally runs on alternating current (AC), which helps break up the tough aluminum oxide layer that melts at about 3,700°F while the base metal melts near 1,220°F.
Strength depends more on joint design, material, and weld quality than on the process itself. Properly executed welds from any of the four processes can meet code requirements, though TIG generally produces the cleanest, most consistent metallurgy, while flux-core delivers the highest deposition for heavy structural work.
Stick welding and self-shielded flux-core welding are the best outdoor options because their shielding comes from flux rather than a shielding gas bottle that wind can blow away. MIG and TIG need gas shielding and are best used indoors or behind a windbreak.
Yes. OSHA warns that welding fume can contain metals such as manganese, chromium, nickel, cadmium, and lead, and that prolonged exposure may cause lung damage and cancers of the lung, larynx, and urinary tract. Welding on stainless steel creates hexavalent chromium, which OSHA limits to 5 µg/m³ over an 8-hour average, so ventilation and respiratory protection matter.
The U.S. Bureau of Labor Statistics reports a 2025 median annual wage of $53,750 for welders, cutters, solderers, and brazers, with the top 10% earning more than $77,530. Employment is projected to grow about 2% from 2025 to 2035, with roughly 40,300 openings per year on average, mostly to replace retiring or transitioning workers.