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in my experience 6000 series aluminum only stays T0 while in a controlled temperature state, basically if it is allowed to assume room temperature it is basically T4 by that point.
There maybe something else going on in the weld bead that I am unaware of (we do not weld on any of our flight parts.)
If you find a paper on any specific alloying concerns related to the weld joint or bead please forward them, I am always interested in learning.
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