Weld filler alloys comprising aluminum, copper, lithium and, optionally,
silver are disclosed which possess significantly improved fabricability
and weldability. The weld filler alloys are free of magnesium and can be
easily drawn into weld wire that is useful for welding aluminum-base
alloys. Weldments made with the filler alloys exhibit highly improved
mechanical, physical and corrosion resistance properties. The weld filler
alloys may be used to weld cryogenic containers for space launch vehicles
and the like.
