We have several weld jigs for flat .250 thick 6061-t65 aluminum. Weld from 1 side only, approx 4.000 weld bead, .093 gap between the 2 pieces, with a C110 copper insert .031 below the opposite side. My problem is with the copper insert. They only last approx 2 weeks before needing resurfaced. Is there a material more suitable than copper?
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