High-temper aluminum can crack during bending, so press brake operators might need to anneal it. Aluminum doesn’t change color when heated. If a metal fabrication shop doesn’t have a temperature gun, watch the soot.
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Which Aluminum Alloy Bends Best? – Clinton Aluminum
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Bending aluminum 101: How to bend 6061-T6 aluminum
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Page 111
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Alum Plate Bend Test Fail - Welding, Bonding & Fastener