I worked for one of the major A/C manufactures and they used 6061 for
several welded assemblies including the nosewheel fork , they formed the
parts cold and we pre-heated and welded the assemblies and they were sent
out for heat treat to bring the parts back to the T6 condition or about 35 K
Tensel , I can't ever remember seeing a piece of alum. or steel that said
aircraft on it , a Mil. spec no. might be stenciled on sheet , most
structural alum. used in A/C construction is 2024-T3 . Phil L.
wrote in message
ps.com...
I have run across someone who insists that
6061 T6 is not "aircraft grade aluminum".

He claims that there are no certified parts made
from 6061. I find that hard to believe. Aren't there
certified aircraft with welded aluminum frames?

--

FF