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Ya, the etched copper power board had B+ and B- right on opposite sides of the board, with only 1/16" of FR4 separating them where the holes were. If anything got on that FR4 to reduce the resistance a bit, a sustained arc could have happened. 168v is plenty for an arc welder, and it sounds like the copper vaporized once the arc started. Joe had something like that happen. I haven't heard of it happening with the power boards that have the solder mask. Man, I'm sorry about that!
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