Arc stud welder.
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Previously:
https://www.homemadetools.net/forum/...974#post156905
https://www.homemadetools.net/forum/...907#post152752
https://www.homemadetools.net/forum/...743#post152108
https://www.homemadetools.net/forum/...828#post148406
https://www.homemadetools.net/forum/...412#post146719