Heat treating aluminum header?

[JonLowe at aol.com]

After many many flights, I had an aluminum header break for my OS 1.60.  I 
had it welded up by a very good welder, but the header broke again after one 
flight in an area removed from the weld, but close enough that it would have 
gotten pretty hot.  I suspect that the heat treat of the header got changed.  Any 
ideas on how to try to heat treat a second pipe that has benn welded to try to 
at least get more than one flight?  I've odered a new header, but it is not 
here yet.

Thanks

Jon Lowe
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