Passivating welds with electrolytic cleaning.
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1:29 source video:
https://www.youtube.com/watch?v=yBA0VXP7bl8
More:
How it Works - Electrolytic Weld Cleaning - Stainless Finishing Solutions
WeldBrush 500 - Weld Cleaning Technology
https://en.wikipedia.org/wiki/Passivation_(chemistry)
Previously:
https://www.homemadetools.net/forum/...6268#post83362
https://www.homemadetools.net/forum/...3368#post98869
https://www.homemadetools.net/forum/...2791#post97149
https://www.homemadetools.net/forum/...7862#post86386
https://www.homemadetools.net/forum/...2814#post97209
https://www.homemadetools.net/forum/...968#post100346