| 摘要 |
A welding method includes performing welding to form a weld metal consisting essentially of, in mass %, <tables id="TABLE-US-00001" num="00001"> <table frame="none" colsep="0" rowsep="0"> <tgroup align="left" colsep="0" rowsep="0" cols="4"> <colspec colname="offset" colwidth="14pt" align="left"/> <colspec colname="1" colwidth="63pt" align="left"/> <colspec colname="2" colwidth="70pt" align="left"/> <colspec colname="3" colwidth="70pt" align="left"/> <THEAD> <ROW> <ENTRY/> <entry namest="offset" nameend="3" align="center" rowsep="1"/> </ROW> </THEAD> <TBODY VALIGN="TOP"> <ROW> <ENTRY/> <ENTRY>C: 0.01-0.15%,</ENTRY> <ENTRY>Si: 0.02-0.6%,</ENTRY> <ENTRY>Mn: 0.6-3.0%,</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Al: 0.004-0.08%,</ENTRY> <ENTRY>Ti: 0.003-0.03%,</ENTRY> <ENTRY>B: at most 0.005%,</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Cu: 0-1.2%,</ENTRY> <ENTRY>Ni: 0-3%,</ENTRY> <ENTRY>Cr: 0-1.2%,</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Mo: 0-2%,</ENTRY> <ENTRY>V: 0-0.05%,</ENTRY> <ENTRY>Nb: 0-0.05%,</ENTRY> </ROW> <ROW> <ENTRY/> <entry namest="offset" nameend="3" align="center" rowsep="1"/> </ROW> </TBODY> </TGROUP> </TABLE> </TABLES> 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° C. after welding satisfies the following Equation (1): <?in-line-formulae description="In-line Formulae" end="lead"?>T(seconds)>=exp(7.0xPw+4.66) Equation (1)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>Pw=Pcm+HD/60 Equation (2)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>Pcm(mass %)=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B Equation (3)<?in-line-formulae description="In-line Formulae" end="tail"?> HD [ml/100 g]: amount of hydrogen in the weld metal immediately after welding.
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