Quote:
Originally Posted by Chadworkz
I have TIG welded 7075-T6 successfully on many different occasions, both thin and thick gauge, it just takes some time, practice, and getting used to. 7075 doesn't pool (puddle) like 6061 or other similar aluminum alloys (like 4042, 4052, 5052, etc.), and you can't stop & start. You have to start and then weld continuously for the entire seam/joint you are working on. If you stop, it can make it very difficult to start a new pool (start welding again) where you stopped, because the heat hardens the aluminum, raising the melting point of the aluminum right where you stopped, while remaining low just a couple inches away. If you do have to stop, it's best to start again from the other end, welding back toward where you stopped.
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You can get 7075 to stick together, and make the welds "look" good, but you have all the structural strength of a piece of plastic - may as well use double backed tape. I've torn off 70 series weldments with a prybar that looked perfect.
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