Originally Posted by 41'srfun
How about using something like a battery kill switch on the ground cable, just before the ground clamp? It would kill the current flow of the arc and still let the wire keep feeding. That way you wouldn't have to mess with the inner workings of the welder itself.
Use a momentary normally open switch. Step on it to make the circuit, lift your foot when you want the arc killed, brilliant I tell you!