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Old 01-09-2013, 11:05 PM
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General Martok General Martok is offline
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wow alot of theory

A diagram of the CONTROL CIRCUIT is needed.

Only switch the control power not the main power to the step down transformer or the IGBT or MOSFET in a Welder.

An IGBT /MOSFET doesnt like counter EMF when the ground is pulled off.

Separating the motor control solenoid from the arc firing circuit should be easy

with a diagram.

A foot pedal has a variable rheostat in it ,it doesnt shut current off all at once

it goes from 0-high then high -0, you could put a switch in it for just off and on

like a 15 amp light switch But have to know how much current follows thru the circuit,shouldnt be much at all,unless something else is pulling some amps,on the same control circuit.

I like your idea makes sense good luck with it.
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