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@xrayspex
There was some discussion about heat treating aluminium or not just recently in the tester approves thread. The treatment must relax/modify some microstructure and I can't imagine why a second treatment would have any further effect than modifying the microstructure around the new welds, but I am not a a materials scientist...
https://www.lfgss.com/conversations/244356/?offset=775#comment14660861