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Date: Mon, 06 Dec 2004 09:40:59 -0700
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
From: Bill Dube <bdube@al.noaa.gov>
Subject: Temper? (was: Bed mount)
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>  It turned out well; in fact I used the plate as part of a fixture for 
> welding my 4130 engine mount and found it held up unbelieveably well near 
> flames.  I was sure I would have to repaint it, but it came through unscathed.

         What about the temper in the aluminum?

         I would be very nervous if I heated a tempered aluminum plate much 
over 350 F. This is a very conservative number, but it is commonly used as 
the threshold for tempered aluminum.