Looking at HF Inverter Arc Welder - 80 Amp it says it has an open circuit voltage of 60 volts DC. Probably pulsed dc, but maybe not. Haven't looked at it on a scope. At any rate, it can put out up to 80A, way more than necessary, but that rating is for 35% duty cycle, anyway. At 20A or so, I'd think it would run continuously. It's a little nipper, too. Smaller than a lunch box, and $150. Runs on 120VAC. Might have to add some cazapitors to the output if it's choppy voltage. I'd also add a smooth-start circuit consisting of a timed relay and a resistor that lets the cap charge through the resistor for 5 or 10 seconds, and then parallels out the resistor. That's gonna be one big relay, too. Oh, a 30A automotive relay would probably do the trick. Parallel 2 sets of contacts and it would be fine. Looking for a way to power 3 or 4 Geckos on original Bridgeport 8A (run them at 7A) steppers. Anyone try this? Anything wrong with this picture?

cnc1000

New comment: Looks like their TIG welder # 66787 might be a better fit. 220V. Anyone try this already?