Patent ID: 6369347
Filing Date: 2002-04-09
Classification: C22C

Abstract:
An aluminum alloy sheet for use in an automobile body sheet having excellent weldability by means of resistance spot welding, said sheet comprising a starting aluminum alloy sheet having an alloy composition containing from 2 to 6% by weight of Mg, from 0.15 to 1.0% by weight of Fe, from 0.03 to 2.0% by weight of Mn, the rest of which constituted by aluminum and unavoidable contaminants; and a surface layer disposed over one surface of the starting aluminum alloy sheet to be pressed against electrodes for use in welding, the surface layer containing a particulate inter-metallic compound having a particle diameter of at least 0.5 &mgr;m and a density of at least 7,000 particles/mm2.