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Re: aluminum design

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>A poorly welded aluminum joint may
>lose up to 60% (or more!) of the base metal properties if not executed
Actually in, say, 6061-T6 the very best weld joint loses about 40% of the 
base metal strength, just due to weld heat input alone. The loss is 
roughly the same for other alloy series.

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)