When your DC stick welder is set to straight polarity or you are running flux core wire in your wire feeder welder, the "ground" clamp is actually the positive lead and the electrode or wire is negative. Seems like there might be a problem there but it's been done lots of times and never heard of any trouble
If you are using your DC welder with reverse polarity or running solid wire with gas in your wire welder then the ground clamp is negative and the electrode or wire is positive. Seems like less potential for problems there. This is what I've always done and never had a problem.
Throw TIG in the mix and my head really spins about what it might do. I've never TIG welded anything while still attached to the vehicle.....
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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