| abstract |
(57) [Summary] [Purpose] Oil containing CO 2 , natural gas, or CO The present invention relates to a gas metal arc welding method suitable for circumferential welding of a line pipe for transporting 2 , and particularly provides a welding method excellent in selective corrosion resistance of weld metal and low temperature toughness. [Composition] As a chemical component of the weld metal, C: 0.03 ~ 0.08%, Si: 0.05-0.60%, Mn: 0.7-2.8%, Cr: 0.7-2.0%, Ti: 0.003 to 0.045%, Al: 0.06% or less, 0.15 ≦ Pcm = C + Si / 30 + Mn / 20 + Ni / 60 + Cu / 20 + Cr / 20 + Mo / 15 + The steel pipe base material and the welding wire are combined and welded so as to satisfy V / 15 + 5B ≦ 0.25. |