Woody V Posted March 2 Share Posted March 2 8 hours ago, JayW said: annealed material is soft and without any real strength. That is probably the basic condition of any aluminum alloy. It must be heat treated to give it the kind of strength required for aircraft structure. Depends on the alloy. The most common alloy used on the aircraft I worked on in the 60s was 2024 which is alloyed with copper and was available annealed if you needed to make something like a leading edge rib. Heat treating it is relatively simple, just heat it to a certain temperature for a certain amount of time. 2024-0 is annealed and 2024-T3 is heat treated. There is also pure aluminum 1100 that is dead soft that can't be heat treated. The 1100 I ever saw was used to make a certain kind of rivet. JayW and Derek B 2 Link to comment Share on other sites More sharing options...
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