Learn TIG Welding: A Beginner’s Roadmap to Real Skill

You watched a dozen TIG videos, bought a machine, and produced what looks like a string of melted beads stuck to a piece of scrap. Nothing was on fire, so you took the helmet off and felt like a failure. That reaction is the most common thing I hear from new TIG welders, and it is also good news, because the gap between a messy first bead and a clean one is not talent, it is technique, setup and repetition. TIG welding rewards the person who understands what the machine is doing far more than the person with the steadiest hand.

Why Learn TIG Welding? (What GTAW Actually Buys You)

Start with the name, because it changes how the rest of this article reads. TIG is the shop name for gas tungsten arc welding. The formal designation is GTAW, and the American Welding Society lists it as process number 141 within its codes and standards framework. So when a drawing calls out “GTAW 141” or an inspector asks which process you used, they mean the same thing as the torch with the tungsten sticking out of the front.

The distinguishing feature lives inside the torch. A non-consumable tungsten electrode creates the arc, and it is not designed to be eaten away, so it gets ground rather than replaced. Filler metal arrives separately, as a rod you dip into the molten puddle by hand. That single design choice creates nearly every advantage and nearly every difficulty that follows in TIG.

What GTAW actually buys you

The reasons beginners choose this process hold up better than most shop myths.

• Clean, spatter-free beads. There is no flux to slag over the joint and almost no spatter to grind off. The bead comes out close to finished condition, which matters enormously for visible work.
• Genuine heat control. The foot pedal varies amperage continuously rather than stepping between preset levels. That is why TIG handles thin gauge sheet and stainless trim without cooking through them.
• Filler placement under your control. You decide exactly where the filler goes, how much, and when. It is how you fill a gap, build up a joint or cap the end of a bead without distorting the part.
• The realistic route to aluminum and thin stainless. These materials need focused heat and a steady hand. If your project list includes a trailer, a bike, a boat or a stainless tank, TIG is the process that gets you there. Our guide to aluminum MIG welding explains why many shops still reach for MIG first, but TIG is where the control lives.

Being honest means naming the costs as well.

• Slower than MIG or flux core. Because filler is added by hand, one rod dip at a time, production rate drops sharply on thick material.
• Steeper learning curve. Puddle control, torch angle and filler timing are separate skills, and they arrive slowly.
• Higher shielding gas use. A TIG shield commonly runs at higher flow than a MIG gun, so argon consumption per hour of arc time goes up.
• Wrong tool for some work. Thick structural production usually belongs to stick or flux core, where SMAW still wins on speed, simplicity and working outdoors without cylinders.

TIG, MIG and stick side by side

Process	How filler arrives	Great at	Watch out for
GTAW (TIG), AWS 141	Hand-fed rod	Thin gauge, stainless, aluminum, clean visible work	Slowest of the three, most gas use, steepest learning curve
GMAW (MIG), AWS 131	Continuous wire from the gun	Production steel, structural work, thick plate	Less precise on thin material, spatter and heat mess on aluminum
SMAW (stick), AWS 111	Consumable stick electrode	Heavy plate, field work, structural fabrication	No shielding gas, more slag, slower on thin sheet

Who gets the most out of TIG

In practice, the people who get their money back fastest are hobbyists and home shops working on their own projects, art and custom work, anyone building or repairing bikes (see our alloy wheel welding guide for a hard case), HVAC and pipe work where tube and stainless show up constantly, and repair shops where the job is one-off and the wrong bead means a comeback. If aluminum is anywhere in your future, learning TIG early is simply cheaper than learning it later.

How long competence actually takes

Expect hours, not days. Most beginners produce a recognizable weld within the first hour and a consistent one after a few dozen hours of focused practice. Welding to a code, in a position, on production work takes months, not weekends.

One more thing worth knowing early: in commercial settings, federal rules require employers to insist that cutters, welders and supervisors be suitably trained in the safe operation of their equipment and the safe use of the process. Learning at home is fine, but if you weld for someone else, that bar is real, and the AWS runs formal certification and education tracks such as CWE and CWI that sit above a course certificate.

The rest of this guide handles the practical questions in order: what to buy and how to set up a safe bench, a 30-day practice plan, the core technique that separates a good bead from a lumpy one, how to choose between self-teaching and classes, the safety rules most tutorials skip, the beginner mistakes worth making once, and what the first year of a TIG career looks like.

How TIG Welding Works: Tungsten, Polarity, and Shielding Gas

Most beginners treat the TIG machine like a black box. Turn a knob, strike an arc, hope for a bead. That works fine until something goes wrong, and then you have no idea which control to change. TIG is actually one of the more predictable processes once you understand three things: where the arc forms, which way the electrons flow, and what keeps the air away from a puddle at 3,000 degrees.

The Arc: A Wire, a Workpiece, and a Narrow Column of Heat

Gas tungsten arc welding, or GTAW, is the American Welding Society’s process number 141. The name tells most of the story. A tungsten electrode, which is not consumable, establishes the arc. An inert gas, usually argon, floods the area with a protective blanket. A filler rod is fed in by hand from the other side, and it is the only part of the process that gets used up.

The arc is a column of ionized gas between the pointed tungsten tip and the workpiece. Electricity pushes through it, and the arc is extremely concentrated. That narrow, intense heat source is why TIG can weld 24-gauge stainless sheet or 1/8-inch aluminum tube without warping the whole part. It is also why TIG is slower than MIG, where the wire itself carries current to the work and lays down far more metal per minute.

Think of the two consumables in terms of jobs. The tungsten is the tool; it conducts electricity, focuses the arc, and does not melt away. The filler rod is the material; it melts into the puddle to fill the gap. Most beginners use far too much filler, a habit worth breaking early, because the arc alone can do a surprising amount of joining on thin material.

Polarity: Deciding Which Side Gets the Heat

Polarity is which side of the circuit is positive and which is negative. It sounds like a detail. It decides where heat concentrates, how hot your tungsten runs, and whether an aluminum oxide layer ever gets cleaned up. This is the single most useful thing to understand about TIG.

DCEN, electrode negative, is the default for most TIG work: mild steel, stainless, chrome, and most exotics. The workpiece is positive, the tungsten negative. Roughly two-thirds of the arc heat lands in the workpiece and about one-third stays in the electrode. That split is exactly what you want on steel. You get deep penetration where you need it, and the tungsten stays cool enough to hold a stable point rather than wandering around the gas cup.

DCEP, electrode positive, reverses the heat distribution. Most arc heat stays in the tungsten, which melts it down and blunts the point quickly. DCEP is a diagnostic tool rather than a production setting. If an arc will not stay put on a given tungsten, trying DCEP briefly is a legitimate troubleshooting move, because it changes the heat balance enough to reveal a bad ground or a badly shaped electrode. Some aluminum procedures use DCEP for cleaning passes, and it appears occasionally in tube and socket weld prep work.

AC, alternating current, exists for one reason: aluminum. Aluminum forms a thin, stubborn oxide layer, and under a straight DC arc that layer just sits there and repels the filler. AC flips polarity every half cycle, so cleaning action on one half cycle is followed by penetration on the other. The oxide gets swept back into the puddle and the joint fuses. This is why an AC/DC machine is not a nice-to-have if aluminum is anywhere in your future. If that describes you, the guides on aluminium welding courses and costs and alloy wheel welding are worth reading before you commit to a machine.

Tungsten Types and Tip Geometry

Not all tungsten is the same, and the wrong type is a leading cause of unstable arcs. Four families cover most shop work:

• Pure tungsten (green): The original general-purpose electrode. Extremely stable on AC and usable on DC, but soft and the least resistant to harsh DC heat. A reasonable choice for pure AC aluminum.
• Ceriated tungsten (light gray): Adds roughly 0.8 percent cerium, improving arc start and lowering the current needed to maintain it. A good all-round choice for DC work on aluminum and stainless.
• Lanthanated tungsten (gold): Contains around 1 to 2 percent lanthanum and is the most popular modern DCEN electrode. It holds a sharp point well, starts cleanly, and resists the erosion that ruins pure tungsten on DC steel.
• Thoriated tungsten (red, about 2 percent thorium): The classic workhorse for DCEN steel and stainless, with excellent arc characteristics and long life, offset by a small and declining health concern because thorium is radioactive. It is restricted for sale in some countries, and many shops have moved to lanthanated as a drop-in replacement.

Tip geometry matters as much as the alloy. On DCEN, grind a point roughly two times the electrode diameter. A 3/32-inch tungsten wants a point about three times as long as the diameter is wide. A balled tip on DCEN signals amperage too high for the electrode size. On AC aluminum, ball the tip into a round shape. The ball does the oxide cleaning on the cleaning half cycle; a pointed AC electrode wanders and throws spatter.

One more rule: do not touch the ground tungsten with your fingers. Skin oils, moisture, and sweat salts contaminate the tip, and contaminated tungsten is a common cause of a wandering arc and porosity. Grasp it by the plastic cap, grind the last half inch, and wipe the fresh tip with a clean, lint-free wipe or suitable solvent. For a deeper look at contamination, the aerospace TIG welding standards guide covers the strict end of the same practices.

Shielding Gas: The Invisible Part You Pay For Every Time

The argon blanket does two jobs at once. It protects the molten puddle from oxygen and nitrogen, which would otherwise oxidize the metal and cause porosity. It also keeps the tungsten from oxidizing and eroding, and it cools the torch tip. Remove the gas and you do not get a slightly dirtier weld. You get a weld that is not structurally sound.

For almost all steel, stainless, and aluminum TIG work, use pure argon, 99.9 percent or better. Helium mixtures exist for very thick or very hot work, but they change arc behavior and are not what a beginner needs. The reason non-ferrous work demands clean, dry argon is straightforward: aluminum and stainless have no carbon content to buffer contamination, so any moisture or oil in the gas path introduces hydrogen, the exact cause of porosity in aluminum. Keep the regulator, hoses, and fittings clean.

For stainless and aluminum tube, back-purging solves a specific problem. The inside of a pipe is open to the air at both ends, and the shield only protects the outside. Weld the inside surface with argon flowing through the tube and you get a clean, bright inner bead with no oxidation tint. It also lets you meet the NFPA 51B and ASME expectations for stainless product work.

Ventilation, Containers, and What the Law Requires

Before any hot work, OSHA requires that hollow spaces, cavities, and containers be vented to permit the escape of air or gases before preheating, cutting, or welding, and specifically notes that purging with inert gas is recommended. A sealed drum or capped pipe can build pressure and burst, and fume trapped inside cannot be captured by a hood. It is the reason you cap and vent, purge and drape your work, and think about where the gas goes before you strike an arc.

OSHA also requires that helmets or hand shields be used during all arc welding operations, and that helpers and attendants receive proper eye protection, under 29 CFR 1910.252. The same standard expects employers to include fluxes, coatings, coverings, and filler metals in their hazard communication program so workers can access labels and safety data sheets, and it requires filler metals and fusible granular materials to carry a minimum notice warning against use in areas without adequate ventilation, referencing ANSI Z49.1. If you buy filler rod from a supplier, the label is part of the safety system, not a sticker to peel off.

For eye protection specifically, OSHA’s shade selection guide lists gas-shielded arc welding of nonferrous materials at shade 11 and gas-shielded arc welding of ferrous materials at shade 12. A helmet that is too dark makes the puddle invisible, and a puddle you cannot see is a puddle you cannot control: a technique problem and a safety problem at once.

Arc length, torch angle, filler timing, and amperage are what you will practice for the next month. But the arc itself, the polarity switch, the tungsten, and the gas determine whether the machine behaves or fights you. Get those four right and the rest of TIG becomes hand-eye coordination and repetition. Get them wrong and you will spend the whole month blaming your technique for a setup problem. Next, we put that understanding to work on the bench: choosing a machine, picking a torch, and building a setup that will not hurt you.

Choosing a Machine and Setting Up a Safe TIG Bench

Buy in this order: machine, torch and consumables, gas, then the bench. The welder is the biggest line item, but the machine only sets your ceiling. A well set up bench with a modest inverter will outproduce a premium machine on a kitchen table with no extraction.

The Machine

TIG needs a constant-current DC source. You set the amperage and the machine holds it, adjusting voltage as arc length changes. That is why TIG feels controllable: heat comes from one control, arc length from your hand, and the two stay independent.

Do not assume a stick machine will do. Most stick welders output DC, but TIG also needs high-frequency arc initiation, a torch, a foot pedal and amperage control down to single digits for thin material. Verify any “DC TIG capable” claim before you buy.

Single versus dual output: single output means one DC circuit you reconfigure between TIG and stick. Dual output means two independent circuits, typically one DC for steel and stainless plus a second AC output for aluminum, so you switch materials without rebalancing the machine or swapping leads. If aluminum is anywhere in your plans, buy AC/DC capability now. It is the most common reason people upgrade, and adding it later usually means buying another machine anyway.

Amperage range and duty cycle: a real 200 to 250 amp machine covers plate, tube and pipe work and leaves room for stainless vessel fabrication. The low end matters more to a beginner. Look for control reaching roughly 5 amps, because 24 and 26 gauge sheet and thin-wall tube live down there. Check the nameplate for duty cycle: it states how long the machine runs at a given amperage before it needs to cool, and many inverter units are rated 60 percent duty cycle at full output.

Torch, Tungsten, and Filler

Air-cooled torches are the right call for nearly everyone learning. They cost less, need no coolant loop and stay lighter in your hand. Water-cooled torches make sense for continuous production above roughly 200 amps, where heat soaks into the handle. Confirm the torch connector style matches your machine and that the cable is rated for your amperage.

Tungsten diameter has to match your amperage or the arc wanders and the electrode balls up. Rough starting points: 1/16 inch (1.6 mm) up to about 80 amps DC, 3/32 inch (2.4 mm) from roughly 80 to 150 amps, and 1/8 inch (3.2 mm) above that. For AC aluminum, grind to a balled tip, not a point.

Use a dedicated tungsten grinder, ideally a small bench unit with its own wheel. Never grind on a wheel shared with other metals; contamination causes porosity and arc wander. Store tungstens and filler rods sealed and dry, in their original tubes or bags, off a damp garage floor. For rod selection by position and base metal, our all position welding rod guide breaks it down further.

• Mild steel: ER70S-6, with 3/32 inch the easy all-rounder
• 304 stainless: ER308L; ER309L for stainless to mild steel joints
• Aluminum: ER4043 for thin material and smooth beads, ER5356 where strength matters

Gas Setup

You need a cylinder of pure argon, a regulator, a genuine variable flowmeter and a TIG-rated hose. Pure argon covers steel, stainless and aluminum. Argon blends belong to MIG and flux core work, so skip them unless you also run MIG.

Flow rate matters and it is machine specific. Small joints typically run around 15 to 25 cubic feet per hour at the torch, but the flowmeter reading is not the flow at the torch because hose volume counts, and some machines refuse to strike below a set gas minimum. Read the maker’s spec and follow it. Our gas, cylinder and supply guide covers sizes, fittings and handling.

PPE and the Bench

A helmet with the correct lens shade is non-negotiable. Shade 10 is a sensible starting point for thin-gauge TIG, stepping up for heavier plate. Add gauntlet-style cuff leather gloves, a leather jacket or apron and safety boots; CCOHS recommends leather aprons and welding jackets and notes leather is a good electrical insulator when kept dry.

On the bench, plan for fume extraction, a fire blanket rated for welding, a heavy bench vise and a solid ground clamp with copper or brass jaws. Fire protection and hot work practice follow NFPA 51B.

Ventilation is the part people skip. OSHA requires general mechanical ventilation of at least 2,000 cubic feet per minute per welder where local exhaust ventilation or approved respirators are not provided. Mechanical ventilation is also required in spaces under 10,000 cubic feet per welder, in rooms with ceilings under 16 feet, in confined spaces and anywhere cross-ventilation is obstructed.

Where a movable hood is used, it must hold 100 linear feet per minute in the zone of welding, so the required airflow scales with hood distance:

Hood distance from arc	Airflow (cfm)	Control velocity (lpm)
4 to 6 inches	150	70
6 to 8 inches	275	130
8 to 10 inches	425	200
10 to 12 inches	600	280

A Realistic 30-Day Plan to Learn TIG Welding

“Learn TIG welding” is a goal, not a plan. Thirty days will not make you a journeyman, but it will take you from a sputtering, lumpy blob to a bead you would actually put your name on. It works if you spend the time deliberately, and if you know what “better” looks like at the end of every stage.

Stage	Days	Focus	Measurable target
One	1–5	Machine and safety drills	Repeatable arc start and stop
Two	6–12	Stringer beads, mild steel	Ten beads matching in width and height
Three	13–18	Butt, T and corner joints	Consistent bead on three joint types
Four	19–23	Filler rod, then thin sheet	Evenly filled bead, no burn-through
Five	24–27	Aluminum and stainless	One clean bead in each metal
Six	28–30	Tube, pipe, small project	A finished, usable item

Stage One (Days 1–5): Machine Familiarity and Safety Drills

Learn the machine before you chase the metal. Set up the cylinder, open the argon, set the flow, seat the ground clamp on a steel grounding block, and strike an arc on the block with no workpiece under the torch. Practice starting and stopping until the arc feels predictable. The foot pedal is your amperage control and your best defense against burning through thin material.

Handle the torch properly, lifting and resting it without dragging it along the work. Run the safety drills daily, not once: cylinder upright and chained, hoses inspected, area clear of combustibles, extinguisher within reach, helmet on from the first arc. Never hot work on a used drum, barrel or tank unless it has been cleaned thoroughly so no flammable materials, greases, tars or acids remain, as 29 CFR 1910.252 requires. Cylinder rules sit in 1910.253 and are worth reading once.

Stage Two (Days 6–12): Stringer Beads on Mild Steel

No filler, no joints, no projects. Run straight beads on 1/4 in. mild steel until your hand learns the machine. Ignore how pretty the bead looks and measure what matters: bead width, bead height, arc length and travel speed. All four show up on a coupon, and consistency across them is the strongest predictor of whether you can weld a joint later. Ten beads in a row that match within an eighth of an inch is a good week.

Stage Three (Days 13–18): Joints

Now the shapes get involved. Start with flat butt joints on 1/4 in. plate, then T-joints, then outside corners. Tack and fit each piece before you strike. The goal is a bead that travels the joint at a steady speed with consistent width and height, not a mirror finish. Most welders find gap control and travel speed explain most of what looks wrong in early work.

Stage Four (Days 19–23): Filler Rod, Then Thin Sheet

Introduce filler with the puddle you already have. Dip the rod in so it melts instead of plunging cold into it, feed on the leading edge, and taper off to close the crater. The bead should get fuller, not lumpy. Then drop to 20 or 22 gauge sheet and put the foot pedal to work. Buy filler one rod at a time rather than from a mixed box, because filler choice changes with the base metal and a grab-bag guarantees you will use the wrong one.

Stage Five (Days 24–27): Aluminum and Stainless

Aluminum needs AC, a dedicated clean rod and a dedicated stainless brush, plus ruthless prep. Get the surface right first with our guide to aluminum cleaner for welding. Stainless wants DCEN, low heat input and, for tube and pipe, back-purging with argon. Change rods and brushes between metals so stainless is not contaminated with aluminum copper.

Stage Six (Days 28–30): Tube, Pipe and a Small Project

Rolling a coupon is the hard part. Work a small length of tube or pipe, then build something you will use: a bracket, a handle, a small frame. Finishing a project teaches fit-up, sequencing and cleanup, none of which a coupon teaches.

Make Every Session Count

Keep a scrap coupon book. Cut coupons into uniform pieces, weld them in order, and number each with its settings: amperage, gas flow, filler, torch angle, travel speed. Photograph each bead from the same angle and distance, then compare them side by side at week’s end. Keep a short written log, three or four lines, noting what changed when the bead improved. That log is where the learning happens, because it ties a setting to an outcome instead of just feeling that today beat yesterday.

Coach Yourself: One Variable at a Time

When a bead looks wrong, change one thing and re-run it. Start with amperage, then gas flow, then filler timing, then torch angle. Change two at once and you learn nothing. Consistency beats perfection early on: a repeatable mediocre bead is worth more than an unrepeatable beautiful one, because every real job has to be done twice at least.

Where a Shortcut Is Worth It

Paid classes and shop time can compress the first three stages dramatically, since an experienced welder sees your bad habits while you cannot yet. Look for a class that keeps instructors at the bench, keeps machine-to-student ratios low, and hands out practice coupons to take home. Plenty of beginners start with the aluminium welding course route once basics click. If you plan to teach, AWS publishes education pathways including the Certified Welding Educator (CWE) credential.

Print the stage list, tape it above the bench, and start Stage One tomorrow.

Core TIG Technique: Settings, Torch Angle, and Filler Feeding

A machine holding 125 amps can still hand you a bad bead if the arc is too long, the torch is leaning, or the filler hits the puddle cold. The most quoted shop rule for mild steel is roughly one amp per 0.001 inch of thickness, and that is where every beginner starts.

Setting your amperage

Then adjust. A fillet weld runs hotter than a square butt joint of the same thickness because you build up more metal. Travel speed, shielding gas and alloy move the number, and aluminum runs cooler than steel since it pulls heat away faster.

Steel thickness	Approximate gauge	Starting amperage
0.040 in (1.0 mm)	20 gauge	about 40 A
0.060 in (1.5 mm)	16 gauge	about 60 A
0.075 in (1.9 mm)	14 gauge	about 75 A
0.125 in (3.2 mm)	1/8 in plate	about 125 A

Gas flow and arc length

Argon protects the tungsten and the puddle. Set flow to the machine maker’s spec: roughly 10 to 20 cubic feet per hour on a small cup, more for bigger nozzles. Push past spec and the turbulent shield drags air into the arc, giving a wandering arc and pinholes. Starve it and the tungsten oxidises, the arc colour goes wrong and the weld pits.

For arc length, aim for about the tungsten tip width, up to one and a half times the electrode diameter. Longer and the arc weakens, spits and loses your puddle. On thin material hold closer, near the tip width alone, because the heat is concentrated and the burn-through margin is small.

Torch angle and where the arc points

Hold the torch 10 to 20 degrees off vertical, tilted in the direction of travel so the arc goes into the joint, not along it. The tilt splits force between penetration and coverage: too vertical gives poor coverage and a narrow, deep bead, too far over and the arc pushes molten metal ahead of the puddle. Fillet welds want more tilt than butt welds to cover the vertical leg, and keep the tungsten on the joint or the arc wanders and the bead snakes.

Many shops split practice time by orientation using the 70-15-10 rule: roughly 70 percent flat, 15 percent horizontal, 10 percent vertical, and the remaining 5 percent overhead.

Feeding the filler rod

Hold the rod at about 45 to 70 degrees to the work. The habit that matters most in TIG: dip the rod tip into the puddle and let the puddle melt it, not thrust the rod into the arc and let the arc melt it. A cold plunge makes a lump with poor fusion.

1. Touch the rod tip to the leading edge of the puddle.
2. Let it melt in instead of feeding it sideways at a constant rate.
3. Work in small dabs on the leading edge, not one long push.
4. Keep the rod extension consistent so the hot end never touches the work.
5. Taper the fill off at the end to close the crater.

Rod handling shifts as you move around the joint, and the all position welding rod guide covers how feed angles and hand positions change. Where the work is audited, the same discipline appears in our look at aerospace TIG welding.

Reading the puddle and using the pedal

The puddle is your only gauge: learn its size, shape and colour. A healthy puddle on mild steel sits about a fingertip wide and roughly 1/8 inch deep, elongated in the direction of travel. Shrink it to red dust and you are starving it; let it spread wide and flat and you are too hot. The foot pedal is the real control: tap to raise amperage when the puddle is small, ease off when it runs wide.

Reading the puddle means seeing it, so PPE is technique rather than accessories. OSHA’s welding standard requires helmets and hand shields that protect the face, neck and ears from the arc’s direct radiant energy, so the helmet must fit, sit low enough to catch the arc and carry a shade you can see through. Too dark and you are welding blind.

Starting, stopping and closing the crater

Start on the joint, not the plate edge, and bring the puddle up with a light pedal press rather than stabbing the work. At the end, do not kill the arc and pull away. Taper the amperage down and fill the crater, or use your machine’s crater-fill function. A fast stop leaves a deep hole that cracks as the metal cools.

Why you should not weave

MIG welders weave. Most TIG welders do not. A weave widens the bead unevenly, traps gas in the root and makes heat control harder. Stay with stringers, and for a wider bead open the torch angle or slow down.

Expansion, contraction and cracking

Metal shrinks as it cools, and a weld that locks that shrinkage in builds residual stress. The usual symptom is a crack at the toe of the bead or in the heat-affected zone. Defences: fill the crater, control heat input, match filler to base metal, and on stainless and aluminum avoid dumping too much heat into one small area. On closed frames, weld in a planned sequence so the assembly does not twist apart as it cools.

Choosing How to Learn: Self-Teaching vs Classes vs Online Courses vs Apprenticeships

There is no single best way to learn TIG, because each route sells a different mix of price, speed, structure and coaching. The mistake most beginners make is picking the route that sounds impressive on paper instead of the one that matches their money, their schedule and where they want to end up. Here is how the five realistic options actually compare.

Route	Cost	Time to your first bead	Strongest at	Weakest at
Self-teaching	Lowest	Days	Diagnosing your own defects	Correcting bad habits and safety culture
Community college or trade school	Highest	Weeks	Structured, credential-bearing skill	Cost and time commitment
Online course	Low	Days	The theory half of the process	Torch angle, puddle control, filler feeding
Apprenticeship / on-the-job training	None, you are paid	Weeks	Getting hired and staying hired	Lower starting pay, narrow to one shop’s habits
Vendor or community session	Low	One day	First hands-on feel on a real machine	Only covers the very beginning

Self-Teaching: Fastest to Start, Hardest to Correct

Self-teaching is the cheapest and fastest route to a bead, and it works better than most people expect for visual learners. A photo of a good weld side by side with your own tells you more about cold fusion, excessive reinforcement or a wandering arc than ten paragraphs of theory. The weakness is not knowledge, it is feedback. Without someone watching, a dragging torch, a cold filler plunge or a heavy foot quietly becomes your normal, and you find out when a job fails.

Safety culture is the bigger gap. Fume extraction, hot work permits, cylinder segregation and the discipline of actually wearing the right gloves are habits learned in a shop environment, not from a screen. If you go this route, set yourself deadlines, keep the coupon log from the 30-day plan, and watch every video with one specific question in mind.

Community College and Trade School Programs

These are the structured route: a fixed skill sequence, shop machines, hand tools provided, and a credential at the end that carries weight with employers. They cost the most in time and money, and for a beginner working toward employment they are also the fastest path to work. The aluminium welding course breakdown shows how a typical program is priced and what the syllabus covers. Expect spending a large share of hours on flat and horizontal joints before you are allowed anywhere near vertical or overhead work.

Online Courses: Excellent Theory, Poor Hands

Online training is inexpensive and genuinely good for the intellectual half of TIG: joint design, preheat, filler selection, travel speed, reading a print and understanding what a code is asking of you. It fails at exactly the three skills beginners find hardest: torch angle, puddle control and filler feeding. Those are motor skills with a feedback loop, and a video cannot see whether your rod is being plunged cold. Treat online material as the theory companion to bench time, not a substitute for it.

Apprenticeships and On-the-Job Training

This is the most direct route to a paycheck. Apprenticeships combine classroom instruction with supervised shop time, and they are the only option where you earn while you learn. The trade-off is that you learn one employer’s habits first, which is a feature rather than a bug in industries like shipbuilding, pressure piping and structural fabrication. If you plan to weld for a living rather than as a hobby, start here.

Vendor and Community Training

Many machine manufacturers, welding supply houses and community colleges run beginner TIG sessions on their own shop machines. For a first-timer this is often the single best value on the list: a few hours, a real machine, an instructor who can put a hand on your torch, and no multi-week commitment. A good session also covers hot work safety in the context of OSHA’s welding, cutting and brazing standard, which incorporates NFPA 51B by reference. Treat the rest of the AWS education and certification resources as your homework between sessions.

Qualified Versus Certified: Two Very Different Words

This distinction trips up more beginners than any other. A performance qualification means you welded specific test pieces and an inspector judged them against a code. For structural work that code is usually from the AWS D1.1 series, and for pressure work it is typically ASME Section IX. That is what makes you a qualified welder for a stated process, position, material and thickness range. It is narrow, and it is the qualification that counts on a job site.

A certification credential is something else entirely. The AWS professional certification portfolio includes Certified Welding Inspector (CWI), Senior CWI, Certified Welding Supervisor, Certified Welding Educator (CWE), Certified Welding Engineer, Certified Radiographic Interpreter and Certified Robotic Arc Welding. These verify knowledge of the field. None of them qualifies you to weld anything. A CWE is not a performance qualification, and an online certificate is not either.

How to Vet a Class Before You Pay

• Does the instructor come to your bench? A demo in front of the room is worth far less than feedback at your station.
• What is the machine-to-student ratio? One machine per student, not one per three.
• Does the instructor actually weld? Ask about their own production work and their certs.
• Do you leave with practice coupons? Welded test pieces with your settings written on them are the cheapest portfolio you will ever build.
• Is safety training documented and hands-on? Extraction, PPE, cylinder handling and fire watch should be part of the day, not a handout.

Pick the route that fits your life this year, not the one that sounds most impressive. Plenty of working TIG welders started with a machine and a pile of scrap, and plenty of shop welders owe their current skills to a night class. Whatever route you pick, the case for learning stick and MIG alongside TIG is worth reading first, because most shops run all three.

Safety: The Part Most TIG Tutorials Skip

TIG looks clean and is not. Shielding gas contains the arc far better than flux-cored wire, but a TIG arc still vaporises the metal it lands on, and that vapour cools into a fine particulate you cannot see. Beginners are the most exposed group: they practise longest in the worst conditions, on a garage bench, behind a shut roller door, with an extractor whose filter is clogged. Nobody warns you, because safety is usually the last thirty seconds of a welding video.

What Welding Fume Actually Is

“Fume” is a precise term, not a synonym for smoke. Heat at the arc vaporises fine particles of base metal, filler metal and any coating. The vapour condenses on contact with cooler air and forms a respirable particulate small enough to reach the alveoli. What lands in that cloud depends on what you welded, and the Canadian Centre for Occupational Health and Safety documents the differences:

• Mild steel: mostly iron, with smaller amounts of chromium, nickel, manganese, molybdenum, vanadium, titanium, cobalt and copper.
• Stainless: larger amounts of chromium, including hexavalent chromium, plus nickel.
• Galvanised steel: the zinc coating vaporises into zinc oxide fume, the metal behind metal fume fever.
• Cadmium plating and chromate paints: their own hazards, and chromium plating converts to hexavalent chromium during welding, which CCOHS links to increased lung cancer risk.
• Surface contamination: machining fluids, oils and rust inhibitors add to the load. CCOHS advises removing coatings from the weld area, since stripping them cuts fume and improves the weld.

That is why cleaning counts as prep, not housekeeping. Even on aluminum, where a dedicated aluminum cleaner is standard, you want clean metal for the arc and cleaner air for your lungs.

Ventilation: The Control That Does the Real Work

PPE is the last line of defence. The first is keeping the air clean at the source, and OSHA’s welding ventilation standard is specific. Under 29 CFR 1910.252, general mechanical ventilation must deliver at least 2,000 cubic feet per minute for each welder. In rooms under 1,000 cubic feet, and where the ceiling is under 16 feet or the work sits 3 to 6 feet below it, the minimum drops to 1,000 cfm per welder for that part of the job.

General ventilation only shifts air around. The stronger control is local exhaust: a hood close to the arc that captures the plume before it reaches you. The standard sets a 100 linear feet per minute control velocity at the hood, and its duct table shows how capture collapses as the hood drifts away:

Hood diameter	1 ft from arc	2 ft	3 ft	4 ft
4 in	3 in	4 in	5 in	6 in
6 in	4 in	5 in	6 in	7 in
8 in	4-1/2 in	5-1/2 in	6-1/2 in	7-1/2 in
10 in	5 in	6 in	7 in	8 in

Minimum duct diameter by hood size and distance from the arc, per the table in 29 CFR 1910.252. Confirm against the current standard.

That 100 fpm figure is measured at the hood, not the fan, so an extractor’s advertised airflow says little about real capture. For repetitive work in one spot, a fixed enclosure is permitted: a booth with a small opening that contains the plume, as in the aerospace work covered in our aerospace TIG guide.

Know Your Exposure Limits

The numbers in 29 CFR 1910.1000, Table Z-1 are what good extraction is designed to keep you under:

Contaminant	Permissible exposure limit
Iron oxide fume	10 mg/m³
Zinc oxide fume	5 mg/m³
Manganese fume	5 mg/m³ ceiling
Nickel metal and insoluble compounds	1 mg/m³

These are limits, not goals. Sitting at the limit is legal, not sensible.

PPE: The Last Line of Defence

Assume the air will not be perfect and dress accordingly.

• Helmet and shade. OSHA’s shade table for gas-shielded arc welding runs from shade 8 at low amperage to shade 13 in the 150 to 250 amp range. Too dark a shade is its own hazard: you lose the puddle and start guessing. A flux-core hood performs poorly at low-amp TIG, where the arc is dimmer.
• Leather gauntlet gloves and a leather jacket or apron. Cotton and synthetics melt into skin.
• Safety glasses under the helmet, so you are not helpless when you lift it.
• Laced boots with steel or composite toes.
• Respirators only when ventilation is not possible, and then inside a written programme with medical clearance and fit testing. A dust mask is not a respirator, and neither replaces extraction.

Fire Prevention and Cylinder Storage

Heat and sparks start fires, and TIG spatter travels further than beginners expect. OSHA requires that no welding take place where combustible material lies within 35 feet of the work unless the area is made safe, and it requires a fire watch during welding and for at least half an hour after the work stops. Give that watch the authority to stop the job.

Never cut or weld a drum, tank or bottle that held fuel, solvent or chemicals until it has been emptied, cleaned, purged and tested gas free. Cylinders get the same attention, stored upright, secured and capped, because a full cylinder with a snapped valve is a projectile. On spacing, OSHA’s cylinder storage rule is memorable: oxygen cylinders must sit at least 20 feet from fuel gas cylinders or combustible materials, or behind a noncombustible barrier at least 5 feet high. Argon will not burn, but keep it clear of traffic and heat anyway. Our AllGas welding supply guide covers cylinder handling alongside the gases themselves.

Common Beginner TIG Mistakes (and the Fix for Each)

Almost every bad TIG bead has a cause you can name, which is the good news. A MIG weld that comes out ugly might be gas, wire speed, voltage, travel speed and machine calibration all fighting each other, while a TIG weld that looks wrong points at gas, polarity, electrode condition, or how you handled amperage and filler rod. Change one thing at a time and you will know which fix worked.

1. Wandering arc and porosity from a dirty tungsten

The number one complaint among people learning TIG, and the fix is usually free. A tungsten touched with bare fingers, brushed against dirty steel or contaminated with copper carries oils and metals on its surface, so the arc hunts across the bead and porosity follows.

Fix: grind it with a dedicated TIG wheel or small grinder. A general bench grinder puts iron in the tungsten and you are back to square one. Grind a clean, even taper, wipe with acetone and never handle the electrode bare again. The electrode is a tool, not a consumable, so grinding is the correct repair.

2. Heat, amperage and electrode faults

Fault	What you see	The fix
Amperage too high	Spatter, balling tip, tungsten overheating, burn-through on thin sheet, pinched bead	Drop a setting and let the foot control fine-tune. On thin sheet, open the machine up until the puddle barely moves
Amperage too low	Small sluggish puddle, filler will not melt in, lumpy bead, poor fusion	Add heat, hold the arc closer. The rod tip should vanish into the puddle in a quiet melt
Foot pedal pinned down	Maximum amps all the time, no control for fill, taper or thin sections	Rest the ball of your foot lightly and treat the pedal as a throttle. A cramping foot means the machine is too big
Tungsten diameter wrong	3/32 in. is not for 200 amps and 1/16 in. bakes at low amps, so the tip balls or bends unpredictably	Match the electrode to current and polarity: fine point for small amps, larger diameter with a flat or slightly rounded tip for high amps. Check the all-position welding rod guide or your manual, one variable at a time
DCEP by mistake	Tungsten hot fast, arc stiff, deep narrow bead, poor coverage	DCEN for steel and stainless, AC for aluminium. Check the switch with the machine powered off or the torch disconnected so you cannot get shocked

3. Gas, filler rod and crater faults

Fault	What you see	The fix
Gas flow too low or too high	Too low: tungsten oxidises to dull grey or brown, erratic arc, porosity, easily mistaken for a bad electrode. Too high: turbulence pushes the arc around, the puddle wanders, the bead looks blown by wind	Set flow to the machine and torch spec and check for leaks or a partly closed cylinder valve at every start; porosity on yesterday’s clean bead means a cylinder running low. Reduce in small increments and watch whether the arc settles, or use the gas sensor or preset
Filler added cold or too fast	Lumps on the surface and a lumpy, stacked bead; too fast and the puddle cannot absorb the metal, risking cold fusion	Dip the tip into the puddle so it melts and feed on the leading edge where the heat is working. It should vanish quietly, not plop
Filler touching the tungsten or arc	Rod oxidises, spits, welds itself to the electrode and stops being shielded, so porosity follows	Feed from the side, inside the outer edge of the argon shield but outside the bright core. A grey rod tip means you are too close
Crater cracking from a fast stop	The crater opens with cracks around the rim as the metal shrinks with no molten metal left to feed the contraction; aluminium does it more than steel	Use crater fill, or ramp the amperage down as you finish so the pool shrinks gradually. Slow down at the end and break the arc after the puddle visibly shrinks

Local exhaust ventilation still applies even when the shielding gas is perfect. A fixed enclosure with a top and at least two sides is permitted under OSHA rules when airflow holds 100 linear feet per minute away from the welder.

4. Torch angle and helmet shade

Fault	What you see	The fix
Dragging the torch	Grinds the electrode tip, oxidises the work surface, picks up contamination that causes porosity a few inches later	Hover, do not scrape. Lift after striking the arc and hold a steady gap; hissing or scratching means you are too close
Helmet shade too dark	A fuzzy orange blob instead of a clear pool, so you lose the cues that show the heat is right	Drop to a lighter shade; most beginners do best at shade 10 or 11 for steel. Clean the lens and use an auto-darkening hood

5. Poor joint preparation

Grease, paint, rust, mill scale and cutting fluid all end up in the weld, and oil and water create porosity so severe the bead looks like a sponge. CCOHS notes that coatings and residues such as metal working fluids, oils and rust inhibitors add toxic vapours to the fume as well as ruining your joint, so cleaning is a safety and a quality measure. OSHA also requires degreasing and cleaning with chlorinated hydrocarbons to be kept where vapours cannot reach the welding operation, and filler metal labelling carries a notice to avoid use in areas without adequate ventilation, referencing ANSI Z49.1 for safety in welding, cutting and allied processes.

Clean to bright metal with a wire brush or grinder, remove every trace of paint and keep oil and marking compounds away from the joint. For aluminium a dedicated stainless brush and clean solvent are not optional, as our guide to cleaning aluminium properly before welding explains.

Diagnostic order of operations

When a weld goes wrong, resist the urge to change six settings. This order usually finds the fault in under two minutes:

1. Check the gas. Is the cylinder open, is the flow correct, and is the shield intact?
2. Check the polarity. DCEN for steel and stainless, AC for aluminium.
3. Check the electrode condition. Clean, correct diameter, correct tip geometry, no contamination.
4. Check amperage and filler timing. Only after the first three are correct.

Practise deliberate starts and stops on scrap until each one looks like a single continuous bead, and keep a scrap coupon book: photograph every bead you dislike, and six weeks later the pattern is usually clear.

Going Further: Aluminum, Stainless Steel, Thin Gauge, and Pulse TIG

With repeatable stringer beads on mild steel, you are ready for the metals that made TIG famous. Aluminum, stainless and thin sheet each change the rules, and pulse TIG adds heat control a conventional machine cannot match.

Aluminum: Why AC Matters

Aluminum’s hard insulating oxide reforms the instant it cools, and a DC arc simply bounces off it. AC works because polarity reverses every half cycle: the electrode-positive half scrubs the oxide back, the electrode-negative half puts heat into the workpiece. That sweep is why aluminum TIG runs on AC, and why so many shops buy an AC/DC machine. Check for real AC output with a balance control, not just an AC sticker on the box.

The rest of the setup stays simple: 100 percent argon, and the same tungsten family you already use, ground for AC duty. Some shops run a balled pure tungsten, others use lanthanated or ceriated with the balance set so the cleaning half runs shorter.

Preparation decides the outcome. Weld over clean, bright metal: scrub with a dedicated stainless brush, wipe with clean solvent and let it dry. A carbon steel brush or a wire wheel that has touched steel contaminates the surface and invites porosity. Our guide to aluminum cleaner for welding walks through the prep sequence.

Heat input is the other lever. Aluminum pulls heat away quickly, so the puddle looks loose while the surrounding metal stays dangerously hot. Keep travel speed up, avoid dwelling, and close the bead with crater fill or a downward ramp, because aluminum shrinks as it cools and is prone to cracking. Real work, from alloy wheel repair to boat hull joints, follows the same rules.

Stainless Steel: Clean, Cold and Well Fed

Stainless is DCEN, weldable on the same machine and settings you already use for mild steel. Match filler to base metal: ER308L for 304 and 304L, ER309L for dissimilar joints such as stainless to carbon steel. Keep the filler rod inside the argon shield and out of the outer arc plume, where it would oxidize and spit black slag into the puddle.

Two problems cause most stainless defects:

• Excess heat. It distorts thin work and can leave the heat-affected zone sensitized and prone to corrosion. Use stringer beads instead of wide weaves, and let the part cool between passes.
• Contamination. Dedicated grinding wheels, dedicated wire wheels and a dedicated bench keep carbon out of the weld. For pipe and tube, back-purge with argon so the inside of the joint cannot oxidize.

For high-end stainless benchmarks, aerospace TIG welding standards are the strictest reference point.

Thin Gauge: Where TIG Shines

A TIG machine is often the best way to work 24 to 26 gauge sheet. Use very low amperage, a small nozzle and fast travel. The foot pedal lets you feather the heat and kill a burn-through the moment the puddle grows. Support the sheet with backing bars or a heat sink for zero-gap joints, and check for burn-through after every pass.

Pulse TIG: Control by Design

Pulsed TIG alternates a high peak current with a low background current. The peak melts the puddle and moves metal, while the background current keeps the arc alive with less heat. That means lower average heat input, better puddle control, less burn-through on thin or heat-sensitive metals, narrower beads and less distortion. It helps on stainless and aluminum, but it does not replace fundamentals. Puddle shape, filler timing and joint prep still decide whether the weld is good, so treat pulse as a refinement, not a shortcut. Your machine needs adjustable frequency and duty cycle.

Galvanized and Coated Metals: A Safety Special Case

Zinc and coatings change the fume picture completely. Under OSHA ventilation requirements, welding or cutting involving zinc-bearing base or filler metals, or metals coated with zinc-bearing materials, requires local exhaust ventilation indoors, and confined space ventilation rules apply inside tanks or vessels. OSHA also requires special ventilation and respirator protection for welding involving fluorine compounds, including electrode coatings and fluxes, under the same standard.

CCOHS identifies cadmium plating, chromate vapours from paints and solvents, lead oxide primer paints and plastic coatings as coating-related fume hazards, and recommends removing coatings from the weld area to reduce fume and improve weld quality. That advice helps the weld too, since zinc coating can boil off mid-bead and cause porosity.

Material	Polarity	Gas	Common filler	Critical prep step
Mild steel	DCEN	100% argon	ER70S-6	Remove scale, rust, oil
Stainless	DCEN	100% argon	ER308L / ER309L	Dedicated tools, back purge
Aluminum	AC	100% argon	ER4043 / ER5356	Oxide-free with a stainless brush
Thin gauge	DCEN, pulse	100% argon	Matching or slightly larger rod	Support sheet, fast travel

If aluminum is your main goal and you would rather not touch a TIG machine, aluminum MIG welding is a faster route to some of the same joints, though you give up the control that makes TIG the better answer on thin and cosmetic work.

Your First Year: Building Skill, Certification, and What Comes Next

The first year of TIG is less about talent than about volume. You will lay a few hundred beads, and the arc starts behaving because you finally understand what your hands are doing, not because you got lucky. Here is a realistic map of where you should be at three, six and twelve months.

A realistic timeline

Time	What it looks like
3 months	Consistent flat and horizontal fillet welds in mild steel, clean bead edges, control of the puddle, and the confidence to start on T-joints and thin sheet without panicking.
6 months	Useful on real shop work. You can pass a coupon test, read a simple drawing, handle stainless with DCEN and the right filler, and lay a fillet a paid welder would not blink at.
12 months	Comfortable on aluminum and stainless, able to read a drawing and a joint prep, and fast enough to be counted on for production rather than practice.

Nobody reaches month three without plate marks and a few burned coupons. That is not failure, it is the tuition.

What a portfolio should contain

A folder beats a certificate in any hiring conversation. Build one deliberately:

• Coupons in mild steel, stainless and aluminum, each in flat, vertical and overhead position.
• Written settings on every one: amperage, gas flow, tungsten type and diameter, filler rod, plus a one-line note on technique.
• Photos of each bead from the same angle and lighting, so you can see progress side by side.
• Finished project pieces that somebody wanted made. A gate bracket, a table, a bike rack, a duct transition.
• A practice log with hours welded, settings changed and what went wrong, so your bad habits have a paper trail.

Choose filler rods that actually work in each position. A handy all-position welding rod guide shows what to buy before you practice, and the aluminium welding course overview shows what a dedicated training route looks like if aluminum is your goal.

Qualification is not the same as certification

Two different credential systems get mixed up constantly. The first is performance qualification: you weld test coupons to a specific code and an inspector signs off. Structural work in the US is usually governed by the AWS codes and standards, including the D1.1 series for structural steel, while pressure piping falls under ASME codes and standards such as Section IX. Pass that test and you are qualified to weld to that specification, on its terms.

The second is certification credentials such as the AWS Certified Welding Educator and Certified Welding Inspector. These support teaching and inspection careers, not welding itself. An inspector can tell you your weld is wrong, which is a different job from making it. Read the AWS professional certification paths before you spend money on one.

What employers actually ask for

Most shops want a practical test, usually a coupon or a short job they watch you weld, a resume showing projects, and sometimes a drug test and safety card. An online course certificate rarely makes the list. To see how strict the aerospace end of the trade can be, read aerospace TIG welding standards and training requirements.

Where TIG welders are in demand

• Repair and maintenance shops: thin stainless, aluminum and tube work.
• Sheet metal and HVAC: ductwork, housings, custom panels.
• Pressure piping: stainless and carbon steel, usually under ASME qualification.
• Food and process equipment: sanitary stainless, full of purge requirements.
• Bicycles, custom fabrication and art: where TIG is the default because it looks best.

The running costs nobody budgets for

Argon refills, filler wire, tungsten (which you grind, not throw away), gas cups, nozzles, replacement lenses and extraction filters add up quietly. Set a monthly consumables figure from day one, and keep a spare lens in your helmet, because a cracked lens ends a good session.

Should you learn MIG and stick too?

Yes, because most shops do all three. Start with TIG, since it is the hardest to control and the habits transfer everywhere. Add MIG for production speed and thicker material, then stick for field work, outdoor jobs and heavy structural sections where the process shrugs off rough surfaces. The case for why SMAW still wins in so many shops is worth reading before you commit.

One concrete next step

Stop planning and put a bead down. Print the 30-day plan, set up the bench, pull the trigger on that first stringer bead, and let the next hundred welds do the teaching.

Frequently Asked Questions

How long does it take to learn TIG welding?

Expect a few focused hours to be able to make a clean, repeatable bead on flat mild steel, and roughly 30 to 100 hours of practice before you can handle joints that matter. Most beginners who practice 20 to 30 minutes a day reach shop-ready comfort in three to six months. Progress is faster if you get feedback from an experienced welder or a class, because bad habits are hard to unlearn alone.

Is TIG welding harder than MIG or stick welding?

Yes, in the sense that TIG has more simultaneous inputs: you manage amperage, gas, torch angle, arc length, filler timing and travel speed at the same time, while a MIG gun feeds wire for you. MIG is faster and easier to pick up, stick is the most forgiving and portable. TIG is the hardest to master but the most precise, and it is the best or only option for aluminum and very thin material.

Do I need a dedicated TIG machine, or can I use the welder I already own?

You need a constant-current DC TIG-capable machine; a typical stick machine cannot hold a stable TIG arc because stick power sources are not constant current. For steel and stainless a DC TIG machine is enough. If you plan to weld aluminum, you want AC or AC/DC capability, and that single feature is the main reason people step up to a more expensive machine.

What amperage should I use for TIG welding 1/8-inch steel?

A common starting point is about one amp per 0.001 inch of thickness, which puts 1/8-inch steel near 125 amps, adjusted for joint design and travel speed. Treat that as a starting point and tune by watching the puddle: too low and the filler will not melt into it, too high and you will get spatter, burn-through and a balled tungsten. Write your working numbers on the coupon.

Is DCEN or DCEP correct for TIG welding?

DCEN (electrode negative) is the standard for most TIG work on steel, stainless and most alloys, because it concentrates more heat at the workpiece and limits tungsten heating. AC is used for aluminum because the alternating cycle sweeps the oxide layer aside. DCEP is mainly a troubleshooting setting, used when a specific tungsten or application demands it, and it heats the tungsten much faster.

What shielding gas do I need for TIG?

Pure argon for nearly everything, including carbon steel, stainless and aluminum. Helium mixes were once used for wider, flatter beads on heavy aluminum, and argon-hydrogen or argon-CO2 blends belong to MIG, not TIG. Always follow the machine maker’s flow rate spec, and check for leaks in the hose and regulator, because low flow is one of the most common causes of porosity and a dirty tungsten.

Do I need a fume extractor to learn TIG welding?

For occasional work in a well-ventilated garage, opening doors and a simple fan may be enough. For regular welding, indoor work or stainless and aluminum, a fume extractor with a hood close to the arc is the right investment, since OSHA requires local exhaust ventilation for many materials and sets the control velocity for a movable hood at 100 linear feet per minute.

Should I learn MIG and stick as well as TIG?

Eventually, yes, because shops run all three and most jobs are faster with MIG or stick. A sensible order is stick first for basic arc and safety habits, then TIG for control and stainless or aluminum, then MIG for production speed. If your goal is fabrication, art or repair, spend your first six months on TIG, then add MIG so you can choose the process that fits the job.