Welded Joint And Automobile Component

Abstract: The technique of the present disclosure is for suppressing liquid metal embrittlement (LME) cracking and improving corrosion resistance of a welded joint that is produced by spot-welding a first steel plate and a second steel plate together. In the case of the welded joint of the present disclosure: a first plating layer is provided on a surface of the first steel plate facing the second steel plate; and no plating layer is provided on a surface of the second steel plate facing the first steel plate, or a second plating layer is provided thereon. A boundary plating layer is provided between the first steel plate and the second steel plate and in a 0.5 mm region extending from an end of a corona bond of the spot-welded part toward the outside of the spot-welded part, and a Zn-penetration part is present in the first steel plate and/or the second steel plate adjacent to the boundary plating layer. The Zn-penetration part develops from the boundary plating layer along a steel grain boundary, wherein at the tip position of the Zn-penetration part where the concentration of Zn is 0.1 mass%, the concentration of Mg is 0.20 mass% or lower. The first plating layer and the second plating layer satisfy predetermined relation I.

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