Welded joint

A welded joint in which a first steel sheet and a second steel sheet are welded by arc welding or laser welding, the welded joint comprising:

• the first steel sheet and the second steel sheet;
• and
• a weld bead zone formed by the arc welding or laser welding, wherein
• when a zone, which is not affected by heat due to the welding, is defined as a non-heat-affected zone in the first steel sheet and the second steel sheet, at least one of the first steel sheet or the second steel sheet has a plating layer located on at least part of a surface of a base iron and an oxide layer located on the plating layer in the non-heat-affected zone, the plating layer contains:
• by mass %,
• Al:
• 1.00 to 80.00%;
• Mg:
• 1.00 to 20.00%;
• Fe:
• 0.01 to 15.00%;
• Si:
• 0 to 10.00%;
• Ca:
• 0 to 4.00%, and further selectively contains 0 to 5.000% in total of:
• Sb:
• 0 to 0.500%;
• Pb:
• 0 to 0.500%;
• Cu:
• 0 to 1.000%;
• Sn:
• 0 to 1.000%;
• In:
• 0 to 1.000%;
• Bi:
• 0 to 1.000%;
• Ti:
• 0 to 1.000%;
• Cr:
• 0 to 1.000%;
• Nb:
• 0 to 1.000%;
• Zr:
• 0 to 1.000%;
• Ni:
• 0 to 1.000%;
• Mn:
• 0 to 1.000%;
• V:
• 0 to 1.000%;
• Mo:
• 0 to 1.000%;
• Ag:
• 0 to 1.000%;
• Li:
• 0 to 1.000%;
• La:
• 0 to 0.500%;
• Ce:
• 0 to 0.500%;
• B:
• 0 to 0.500%;
• Y:
• 0 to 0.500%;
• Sr:
• 0 to 0.500%, with the balance composed of 5.00 mass % or more Zn and impurities, wherein
• the oxide layer contains a total of 50 mass % or more of one or more of Zn oxide, Mg oxide, and Al oxide,
• the weld bead zone has a weld metal and a slag layer formed on part of a surface of the weld metal, and
• when Al and Mg are detected elements in the slag layer, the slag layer comprising multiple oxides of Al and Mg, the slag layer contains, by mass %:
• Al:
• 1.0 to 45.0% and
• Mg:
• 1.0 to 30.0%
• with the balance composed of Fe, easily oxidizable metallic elements, and impurities.