| 摘要 |
PROBLEM TO BE SOLVED: To provide a flux-cored wire for gas shield arc welding exerting favorable welding workability in a vertical upward position under the welding condition of high heat input and high interpass temperature and capable of obtaining a high-quality welding part excellent in mechanical performance of a weld metal or the like.SOLUTION: A flux-cored wire for gas shield arc welding toward a vertical upward position contains: in mass% based on total mass of wire, 0.02-0.08% C, 0.3-1.0% Si, 1.8-2.8% Mn, 0.4-2.3% total of AlOconversion value of Al and AlO, 0.2-1.1% Al, 0.002-0.015% B, 5.5-6.8% TiOconversion value, 0.4-1.6% SiOconversion value, 0.1-0.6% ZrOconversion value, 0.1-0.3% Mg, 0.15-0.30% total of conversion values of NaO and KO, 0.03-0.10% F conversion value, and the balance Fe with inevitable impurities. |
