Sumitomo Metal Industries, Inc.

Shigemichi Yamauchi

Nobuaki Takahashi

Masahiko Hamada

Akio Yamamoto

Tomoaki Ikeda

A welding method includes performing welding to form a weld metal consisting essentially of, in mass %,  and a remainder of Fe and unavoidable impurities. The amounts of impurities are P: at most 0.03%, S: at most 0.03%, N: at most 0.01%, Ca or Mg: at most 0.005%. The value of Pcm expressed by the following Equation (3) is in the range of 0.23-0.35%, and the time T until the weld metal is cooled to 100&#xb0; C. after welding satisfies the following Equation (1):(seconds)&#x2267;exp(7.0&#xd7;+4.66)&#x2003;&#x2003;Equation (1)/60&#x2003;&#x2003;Equation (2)(mass %)=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B&#x2003;&#x2003;Equation (3)

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Kashima, Japan

Shigemichi Yamauchi