The best AC TIG welders

Eastwood publishes this machine at 10–220 A in TIG on a 240 V circuit and 10–140 A on 120 V, with AC TIG duty cycles of 40% at the full 220 A and 60% at 179 A. Publishing both supply figures is rarer than it should be in this class, and it is the reason this is the pick: you can size the circuit before you buy rather than discovering after delivery that two thirds of the machine needs an outlet you do not have.

What earns it the top slot on an AC page specifically is the control set. Adjustable AC balance, adjustable AC frequency, and pulse with peak on-time and base current are the four knobs that change how aluminum actually behaves — balance trades the oxide-cleaning half of the cycle against penetration, and frequency tightens or widens the arc cone. A machine with a fixed AC waveform gives you one compromise and asks you to live in it.

The box matters too. A WP-17F flex-head torch on a 12 ft lead with a gas-lens collet body and a #8 cup, a foot pedal, an argon regulator/flowmeter and a ground clamp all ship with it, so the only thing left to buy is the gas bottle. On machines whose pedal is an accessory, the real cost is meaningfully higher than the ticket price.

Where it gives ground: the AlphaTIG below publishes 60% at 200 A against Eastwood's 40% at 220 A, so on long AC passes the cheaper machine has the better rating. And Eastwood publishes a single 1/4 in capacity figure rather than separate steel and aluminum numbers, which leaves less to compare on.

This is the budget pick in the strict sense the site uses: the least expensive product in the registry that actually does the job. The job on this page is AC output, and the AlphaTIG 200X is the cheapest widely supported machine that has it. Everything below it in price in our registry is DC only, which means aluminum is off the table permanently rather than temporarily.

AHP publishes 10–200 A in TIG, a 60% duty cycle at 200 A TIG and 35% at 155 A in stick, 30–70% adjustable AC balance, and a capacity of 24 gauge to 3/8 in on mild steel with 1/4 in on aluminum. The 60% at the full 200 A is the headline: it is a higher published rating at the top of the range than either Eastwood or Lincoln publishes, and duty cycle is what stops you mid-weld rather than at the quoting stage.

Who it is for: someone who has decided aluminum is the reason they are buying TIG and wants the capability without the price of a dealer-network machine. The AC balance range is enough to clean oxide off cast or weathered aluminum, which is where most home aluminum work actually lives.

The costs are real. The bundled torch and consumables are the first thing most owners replace, the manual is thin, and at 50 lb with a foot pedal it lives in one place. If you want to know whether those trades land for you, the full AlphaTIG 200X review takes the published figures apart on their own.

Everlast publishes DC 3–210 A and AC 5–210 A on a 240 V supply, a 60% duty cycle at the full 210 A, AC frequency from 20 to 250 Hz, AC balance from 5 to 90% electrode positive, pulse to 500 Hz in DC and 250 Hz in AC square, nine stored programs, and three AC waveforms — advanced square, soft square and triangular.

The waveform list is the part that belongs on an AC page. Square wave is the default because it transfers the most energy per cycle; a softer wave is quieter and gentler on thin material; a triangular wave concentrates heat for faster travel on thick aluminum. Being able to choose is a genuine capability, not a spec-sheet flourish — but it is also a capability most Level 3 welders will not reach for in their first year.

Two torches, a foot pedal, an argon regulator with hose, a stick holder and starter consumables ship with it, which brings the real cost closer to the ticket price than the number suggests.

Against it: 62 lb and 25 inches wide makes it a bench machine, the parameter count is genuinely overwhelming as a first TIG machine, and on a 120 V circuit TIG output is capped at 120 A, so the 210 A headline is the 240 V figure.

Lincoln publishes the Square Wave 205 at TIG 8–205 A and stick 15–170 A on a 230 V supply, TIG 8–125 A and stick 15–90 A on 120 V, 200 A at a 25% TIG duty cycle with 130 A at 60%, pulse from 0.1 to 500 Hz, AC frequency 60–150 Hz and AC balance 60–90%, through a 4.3 in color LCD. A Caliber 17 torch, Foot Amptrol, regulator/flowmeter, electrode holder and work clamp are in the box.

Who it is for: someone buying one TIG machine for a long time who wants a dealer to call rather than a support email address. That is not a specification and it is the most common honest reason people pay the Lincoln premium. The AC control set here is narrower than Everlast's — 60 to 150 Hz against 20 to 250 Hz, 60 to 90% balance against 5 to 90% — but it covers the range aluminum work actually uses.

The costs: it is substantially more expensive than the AlphaTIG or the Eastwood for comparable output, the 25% duty cycle at 200 A is the lowest top-end rating on this page, and on a 120 V circuit TIG output is capped at 125 A.

Everlast publishes DC 3–250 A and AC 5–250 A, a 60% TIG duty cycle at 250 A with 100% at 200 A, and in stick 60% at 225 A with 100% at 175 A, from a digital microprocessor-controlled IGBT inverter on 110 V or 220 V.

The 100% at 200 A is the whole argument. Every other machine on this page has a number above which it needs to cool down, and on aluminum — which pulls heat out of the weld faster than steel and therefore wants more amperage for longer — that number is the one you hit. If TIG is work rather than a weekend, this is the specification to buy on.

A 225 A stick rating at 60% also means it genuinely doubles as the shop's stick machine instead of pretending to.

Against it: heavier, larger and dearer than any 200 A entry machine, and none of that helps if you weld an hour a week. Everlast's dealer network is smaller than Lincoln's, which matters most on a machine you depend on.