I'd have to try it on scrap first. Anodized aluminum is a no-go for welding it directly, but as a backer, I dont know. I'd be real careful and experiment on some copper that I could do without first. Worth a shot just to prove it one way or the other. What I just found today that I might try is cera...

Is there some reason the ceramic tile can't be glazed? (My hunch is that the glazing melts at a much higher temp than the copper.) Its my assumption that the glazing would interrupt the tile's ability to dissipate heat. "Breathe". Also my instinctual sense is it could sort of explode, not...

Why not buy a piece of unglazed ceramic tile, snap off or cut bits to fit around it , and tape it with aluminum duct tape? I've actually looked around on the web for some ceramic not sold as welding stuff. So far everything I found is pretty expensive. I would probably need the round version becaus...

Thanks Otto, I'm finding these products are only available in boxes of multiples and pretty expensive for a one-off small job. Its good to know that it seems the community here apparently agrees that any metal used as a backer will fuse to the copper. I have used aluminum to back stainless for years...

Thanks Arno, I was wondering if there were non-metal materials out there that could be used as a backer. I'll look in to this, if its truly a tape and flexible it could be perfect for the curvature of the inside of the tube I need to weld/create. I'll see if I can contact ESAB and also do more resea...

Hey all, first time post here. I prefer to TIG weld copper and I make counter tops, etc.. I need to weld a seam on a cylindrical copper shape. I will roll the copper in to a large tube, then I need to weld the long seam down the length. I'm not worried about accomplishing the weld, but I'd like as c...