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maybe tester has more knowledge
I know from looking at the pictures that the frame is fucked and the seller should refund or replace.
6069 is a relatively new (1990s introduction) member of the 6000 series, offering higher strength than the common 6061. Like 6061, it needs heat treatment after welding to T6 (artificially aged) condition to achieve the desired properties. All of which is moot if Mielec use 7005 and 7020, which naturally age harden quickly and can therefore be used for welded structures without post-weld heat treatment.
gbj_tester
@kjlem
I read somewhere it's 6069 T6, maybe @gbj_tester has more knowledge about this material