Welded joint

A welded joint comprising two plated steel sheets with tensile strengths of 780 MPa or more joined by arc welding,

• wherein
• the welded joint comprises a welded part, heat affected zone, and non-heat affected zone;
• the plated steel sheets comprise a base steel sheet and plating layer, the plating layer formed at least at part of the non-heat affected zone, the plating layer containing Zn;
• the chemical composition of the base steel sheet of the two steel sheets comprises
• C:
• 0.05 to 0.40%,
• Si:
• 0.7 to 3.0%,
• Mn:
• 0.1 to 5.0%,
• sol. Al:
• 0.2 to 2.0%,
• P:
• 0.0300% or less,
• S:
• 0.0300% or less,
• N:
• 0.0100% or less,
• B:
• 0 to 0.010%,
• Ti:
• 0 to 0.150%,
• Nb:
• 0 to 0.150%,
• V:
• 0 to 0.150%,
• Cr:
• 0 to 2.00%,
• Ni:
• 0 to 2.00%,
• Cu:
• 0 to 2.00%,
• Mo:
• 0 to 1.00%,
• W:
• 0 to 1.00%,
• Ca:
• 0 to 0.100%,
• Mg:
• 0 to 0.100%,
• Zr:
• 0 to 0.100%,
• Hf:
• 0 to 0.100%,
• REM:
• 0 to 0.100% and a balance of Fe and impurities;
• a total value of contents of Si and sol. Al is 1.0% or more;
• at the non-heat affected zone,
• a depth with a C concentration measured by GDS of 0.05% or less in a depth direction of the base steel sheet starting from an interface of the plating layer and the base steel sheet of the plated steel sheet is 5 μm or more,
• a roughness of the interface of the plating layer and the base steel sheet at a cross-section of the plated steel sheet is an Ra of 3.0 μm or less;
• and
• in a range of 0 to 100 μm from a bead toe of the welded part to an opposite direction from the welded part, a C concentration at a depth of 5 μm of the base steel sheet starting from an interface of the plating layer and the base steel sheet of the plated steel sheet is 0.05% or less.