allanhurst:
The point is that a welder is DESIGNED to take short circuits - your psu isn't, and I'd be worried about damaging it.Can't you buy invertor welders for 110vac? - depends if you've a use for a welder, I suppose.
If you put a 1/2 ohm 1200 watt resistor in series with your psu, it would limit the current to 50amps.
Which is absolutely useless as you need an order of magnitude more current - you have to dump
kilowatts into milliohms, the maths is simple I = sqrt (P/R)