No Ned -- Just use the the ground clamp from the TIG --- the TIG is grounded to your house electrical panel via it's plug.
If I'm welding metal parts on a metal table - I ground the table -- the parts will ground via the contact to the table "most" of the time. I also have a heavy copper strap -- 12"+ long - 2" wide - 5/16" or so thick - and use this sometimes to hold the piece by laying it on the table and onto the work.
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