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It is, it was likely some big thing, like strut support, not small hobby things like jewelry.



Arc welding structural steel with lead-acid batteries is well-established among hobbyists. Here's somebody who reinforced their truck bumper using six 6-volt golf cart batteries, jumper cables, and filler rod, in 2008:

https://www.instructables.com/Golfcart--Welder/




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