That's a good thought, Bill. I dont know why one would need to worry about it too much, as long as you have good grounding.

After all, we are dealing with similar DC currents and voltages as plasma, when we weld. Well, MORE current, and less voltage while welding,..

My main concern would probably be the high freq AC Tig welding.

Perhaps Tom will chime in if he sees this post and,
A: Ease our fears,
B: Recommend a tasty butter or spread that goes well with toasted parts.
Side note, I hope it's fine to do as I've envisioned some automated welding applications for my table.