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I recall something about the path of current possibly traveling through a 'bearing' (wheel, trans, etc.) from the postive welding lead to the ground lead (or vice/versa). Concern would be damaging the bearing(s). I'd make sure whatever 'ground' point was selected is a short and direct path back to the point being welded. Can you weld over/through a ceramic finish? Sounds like it would be tough getting a decent ground/arc established.
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