Steel differential strength welding member having aluminum or aluminum alloy plating layer and method for manufacturing the same

摘要

A steel differential strength welding member having an aluminum or aluminum alloy plating layer, wherein the steel differential strength welding member is formed by butt welding a high strength steel sheet and a low strength steel sheet, and the high strength steel sheet and the low strength steel sheet are at least one on a base body and its surface. of pure aluminum or aluminum alloy plating layer; The component weight percentage of the matrix of high strength steel sheet is: C 0.08~0.8%, Si 0.05~1.0%, Mn 0.1~5%, P<0.3%, S<0.1%, Al<0.3%, Ti<0.5%, B 0.0005~0.1%, Cr 0.01~3%, the balance is Fe and unavoidable impurities; The component weight percentage of the low-strength steel sheet matrix is C 0.03-0.1%, Si 0-0.3%, Mn 0.5-2.0%, P<0.1%, S<0.05%, Al<0.1%, Cr 0-0.1%, Ti 0~0.05%, and the remainder is Fe and unavoidable impurities. The welding seam of the welding member has a tensile strength greater than that of the low-strength steel base material after hot stamping, and the elongation exceeds 4%, meeting the application requirements in the automotive hot stamping area of the welding member. It also relates to a method for manufacturing a steel differential strength welding member having an aluminum or aluminum alloy plating layer, a steel differential strength welding member having an aluminum or aluminum alloy plating layer manufactured by the method, and a welding wire used in the method.