Patent ID: 6953508

Claim:
A weld formed by welding of steel and having a weld metal, the weld metal consisting essentially of, in mass %, C: 0.01-0.15%, Si: 0.02-0.6%, Mn: 0.6-3.0%, Al: 0.004-0.08% Ti: 0.003-0.03%, B: at most 0.005% Cu: 0-1.2% Ni: 0-3%, Cr: 0-1.2% Mo: 0-2% V: 0-0.05%, Nb: 0-0.05% and a remainder of Fe and unavoidable impurities, the amounts of the impurities being P: at most 0.03%, S: at most 0.03%, N: at most 0.01%, Ca or Mg: at most 0.005%, and the value of Pcm of the weld metal expressed by the following Equation (3) (in which the symbol of each element appearing in the equation indicates the content of the element in mass %) being in the range of from 0.23% to 0.35%, and the time T to cool the weld metal to 100° C. after welding satisfying the following Equation (1): T (seconds)≧exp(7.0 ×Pw+ 4.66) Equation (1) where Pw=Pcm+HD 60 Equation (2) Pcm (mass %)=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B Equation (3) HD [ml/100 g]: amount of hydrogen in the weld metal immediately after welding.