Welded Joint

Abstract: [Problem] To improve the corrosion resistance of a rear surface of a welded joint. [Solution] A welded joint according to the present invention relates to a welded joint including a first steel plate and a second steel plate that are connected to a welding bead portion having a longitudinal direction in an extension direction in a plan view. An X-axis direction is defined as a direction perpendicular to the extension direction of the welding bead portion and to a normal line direction to a surface of a non-heat-affected zone of the second steel plate, and on a rear surface of the welded joint, a second plated layer containing a Zn-Mg structure is present on the welding bead portion or a heat affected zone within a range from the center of the welding bead portion and the heat affected zone to 1 mm on both sides in the X-axis direction, and a ratio of SLi to a length of 100 µm in a field of view, obtained by observing a cross-section using an electron microscope, is at least equal to 0.05. Furthermore, in a cross section extending over a range from the center to 5 mm on both sides in the X-axis direction, a mean thickness of a ZnO layer present within the range is at most equal to 1.0 µm.

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