There's three or more different potential issues/scenarios here, depending upon if AC stick welding or using one of several DC welding processes.
With AC welding, there's a possibility for CONTINUOUS AC voltage to be INDUCED in wiring and electronics on the machine as long as welding current is flowing.
With DC welding, there would simply be a "spike" every time the arc is initiated or stopped.
Then there's another scenario, with either AC or DC welding where a ground is not connected properly and actual WELDING current (rather that INDUCED current) flows through the machine frame and mechanism and/or electrical system.
Several times over the years I have read instructions for various equipment that stated "If necessary to weld on this machine, disconnect battery cables and short/clamp them together".
This makes WAY more sense to me than disconnecting the (+) battery cable and simply allowing it to dangle. Doing that (to me) is worse than leaving it connected because there's NO limit on voltages that MAY be induced in that open circuit by AC welding.
With the battery still in the circuit, there's a BIG damping effect on stray voltages, as it takes AMPS to push around the battery's voltage, and not NEARLY so much current to fry electronics!
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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