Welding Joint And Automobile Component

Abstract: The technology of the present disclosure suppresses cracking from liquid metal embrittlement (LME) at a welding joint where a first steel sheet and a second steel sheet have been spot welded, and improves corrosion resistance. In the welding joint, a first plating layer is provided on a surface of the first steel sheet facing the second steel sheet, a plating layer is not present on a surface of the second steel sheet facing the first steel sheet or a second plating layer is provided thereon, and a boundary plating layer is provided between the first steel sheet and the second steel sheet in a range of 0.5 mm from an end of a corona bond to outside of a spot welding section. The higher tensile strength among the tensile strength of the first steel sheet and the tensile strength of the second steel sheet is at least 780 MPa, the area ratio of a MgZn2 phase in a cross section of the boundary plating layer is at least 10%, and the first plating layer and the second plating layer satisfy a predetermined relationship I.

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