[Mark IV]

davd, The hammer and dolly work does not work harden the alloy?

I saw the panelbeaters at Autokraft in 1985 weld the aluminum using "parent metal" (strips of the alloy) and "sooting" the weld area up. When they changed the flame mix they heated until the soot burned off and just after that point the "rod" would flow into the weld area. of course a little more heat and the whole mess ran onto the floor in a puddle.......