ELECTRODE FOR RESISTANCE SPOT WELDING

摘要

PURPOSE:To improve an electrode life by specifying the electric conductivity of the core material and sheath of the electrode for resistance spot welding for aluminum plates. CONSTITUTION:The electrode for resistance spot welding for the aluminum or aluminum alloy plates, materials formed by applying a metallic plating on the surfaces thereof or plated steel plates is constituted by using a metal having >=75 (IACS%) electric conductivity and >=2.5Xt<1/2>(mm), where the thickness of the plates to be welded is designated as (t) as the core material and coating the circumference thereof with a metal having the electric conductivity lower by >=40 (IACS%) than the electric conductivity of the core material and having the m.p. higher than the m.p. of the aluminum or aluminum alloy or plating metal. As a result, the electrode life is improved and the reduction in weight is enabled without degrading production efficiency in mass production of automobiles, etc.