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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.
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