Can you TIG weld copper, brass?

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You can actually weld both copper and bronze with TIG. You can use solid core copper wire for filler metal also on the copper.

When welding copper it requires a pre-heat for it to work dependent on thickness.

I have personally welded .375 thick copper plate using copper core electrical wire as filler and pre-heating until the part glows red. Can't remember the actual temp.

Similar preheat is needed for bronze.

I have never welded copper in production only as a lab experiment during metallurgy while working on my engineering degree. However, it can be done.
 

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