Weld joint

A weld joint produced with a weld metal, using a steel plate as a base metal, wherein

• the steel plate comprises a chemical composition including, by mass %,
• C:
• 0.03% to 0.09%,
• Si:
• 0.01% to 0.35%,
• Mn:
• 1.3% to 2.0%,
• P:
• 0.012% or less,
• S:
• 0.0035% or less,
• Al:
• 0.01% to 0.06%,
• Ni:
• less than 0.3%,
• Mo:
• less than 0.10%,
• Nb:
• 0.005% to 0.023%,
• Ti:
• 0.005% to 0.025%,
• B:
• less than 0.0003%,
• N:
• 0.002% to 0.005%,
• Ca:
• 0.0005% to 0.0050%, and
• O:
• 0.0030% or less,
• Ceq specified by formula (1) below being from 0.320 to 0.420, Ti/N being from 1.5 to 4.0, formulas (2) and (3) below being satisfied, and a balance being Fe and incidental impurities,
• yield stress of the steel plate being 355 MPa or greater, tensile strength of the steel plate being 470 MPa or greater, absorbed energy of the steel plate vE-40° C. at −40° C. in accordance with JIS Z 2241 being 200 J or greater, and
• the weld metal comprises a chemical composition including, by mass %,
• C:
• 0.040% to 0.090%,
• Si:
• 0.1% to 0.8%,
• Mn:
• 1.0% to 2.5%,
• Al:
• 0.020% or less,
• Ni:
• 0.1% to 1.0%,
• Mo:
• 0.05% to 0.50%,
• Ti:
• 0.005% to 0.050%, and
• B:
• 0.0015% or less,
• a balance being Fe and incidental impurities:
• Ceq=[C]+[Mn]/6+([Cu]+[Ni])/15+([Cr]+[Mo]+[V])/5 (1)
• 0<{[Ca]−(0.18+130×[Ca])×[O]}/1.25/[S]<1 (2)
• 5.5[C]4/3+15[P]+0.90[Mn]+0.12[Ni]+7.9[Nb]1/2+0.53[Mo]≤3.00 (3)
• where brackets [ ] indicate the content by mass % of the element in the brackets.