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Old 01-10-2013, 10:14 PM
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ogre ogre is offline
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i'm an electrician, not an electronics guy. i googled mig welder electrical diagram and came up with this schematic (page 36 on the manual pdf link). a magic board controls both the arc and the wire feed motor. the simple way would be to interrupt the ground with a relay and a foot pedal.

my way would be to use a relay and a timer: so that when you let of the trigger a timer would kick in for a determined time and power the feed rollers. set for a second and you would have a seconds worth of wire stuck in the puddle, set to zero and it would be a welder. use a time delay relay like
this no name timer this no name timer
for $20.

my bigger concern would be the amount of heat and puddle required to make enough puddle to stick the wire to it.

http://www.lincolnelectric.com/lincolnpowermig180.pdf

when i did automated welders we had timers for everything even a timer to reverse the wire feed to pull the wire back for the operator. but those were 600 amp continuous power supplies with separate wire feeds running 7/32 flux core wire at 1 ft per second. now that is some serious welding. 55 feet in 56 seconds to weld the backing plate bracket on a ford super duty axle.

Last edited by ogre; 01-10-2013 at 10:22 PM.
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