Tip for great ground
I made a welding table out of aluminum. I know most people won't make a table out of aluminum but you can also lay a 1/8" sheet over your table and hook the ground clamp to it. I have never had arc marks on anything I have welded. Steel only conducts about a 1/4 the current aluminum can. Heck you could also get a thin sheet of copper and put that on top of the table.
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