DIFFERENT-STRENGTH STEEL WELDING COMPONENT WITH ALUMINUM OR ALUMINUM-ALLOY PLATING AND METHOD FOR MANUFACTURING SAME

摘要

Disclosed is a different-strength steel welding component with an aluminum or aluminum-alloy plating. The different-strength steel welding component is formed by means of butt welding of a high-strength steel plate and a low-strength steel plate, and each of the high-strength steel plate and the low-strength steel plate comprises a base body and at least one pure aluminum or aluminum-alloy plating on a surface of the base body. The components of the base body of the high-strength steel plate, in percentages by weight, are: 0.08-0.8% of C, 0.05-1.0% of Si, 0.1-5% of Mn, P 0.3%, S 0.1%, Al 0.3%, Ti 0.5%, 0.0005-0.1% of B, 0.01-3% of Cr, and the remaining components are Fe and inevitable impurities. The components of the base body of the low-strength steel plate, in percentages by weight, are: 0.03-0.1% of C, 0-0.3% of Si, 0.5-2.0% of Mn, P 0.1%, S 0.05%, Al 0.1%, 0-0.1% of Cr, 0-0.05% of Ti, and the remaining components are Fe and inevitable impurities. The tensile strength of a welding seam of the welding component after hot stamping is greater than the tensile strength of a low-strength steel base metal, and the elongation is greater than 4%, such that application requirements of the welding component in the field of automobile hot stamping are met. The present invention also relates to a method for manufacturing a different-strength steel welding component with an aluminum or aluminum-alloy plating, a different-strength steel welding component with an aluminum or aluminum-alloy plating that is prepared by means of the method, and a welding wire used in the method.