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From: Bill Sheehan [email protected]
Date: 10 Jan 2003
Time: 14:13:21
Remote Name: 203.29.131.3
Dennis, the ideal situation is to normalise, weld, anneal - but hardly possible in a complete Chummy body without the required equipment. Provided you allow the weld to cool down gradually it will at least soften the area around your repair, which is something. Be very careful about warping with the heat, otherwise you'll have to shrink. Ask someone who has done it successfully to help. (I looked up my Metal Aircraft Construction & Repair Manuals from my Air Force days, but the procedure is so lengthy it would take a week to reprint). Don't get too involved with the theories - when later I was a Metallurgy troubleshooter for an International company I found that the could do's and should do's didn't always apply. It's what happens in real life that matters - this backed up in later years when I helped a Melbourne friend on a project for NASA. The Yanks told us that of all the known theories in Metallurgy, they'd found over the years that about 28% were either wrong or of no consequence. (Unfortunately they wouldn't divulge which ones!) There's probably more since, though admittedly they deal more with titanium than aluminium these days. Back to Austin Sevens, Cheers Bill