Arc stud welder.
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Previously:
https://www.homemadetools.net/forum/...941#post187155
https://www.homemadetools.net/forum/...291#post165690
https://www.homemadetools.net/forum/...982#post171816
https://www.homemadetools.net/forum/...743#post152108
https://www.homemadetools.net/forum/...908#post194615