[Amps] Sourcing Sheet Aluminum

[Roger]

  On 9/15/
>   at the end of shaping they heat treated them ,then the propertys of them
> are the one you describe Roger
>
Not the stuff we use in aircraft.  We start out with a given temper 
(Usually 6061-T6) which may work harden, but rarely is any of it heat 
treated after forming. Bulkheads, formers, stringers, and skins are not 
heat treated after shaping, at least I don't know of any except small 
parts that are not going to be subjected to heat.  Heat softens and 
weakens most aluminum alloys. 6061 is the alloy.  RC It is subjected to 
rolling or extruding to get to the T6 temper.

73

Roger (K8RI)
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