MIL-W-45210A, MILITARY SPECIFICATION: WELDING, RESISTANCE, SPOT: WELDABLE ALUMINUM ALLOYS (15 JAN 1965) [S/S BY MIL-DTL-45210A]., This specification covers resistance spot welding procedures for weldable aluminum alloys. The materials to be welded under this specification includesheet, bar, and shapes of non heat-treatable alloys and the 60XX series of heat-treatablealloys.