FLUX-CORED WIRE FOR GAS-SHIELDED ARC WELDING METHOD FOR WELDING STEEL FOR VERY LOW TEMPERATURE USE AND METHOD FOR MANUFACTURING WELD JOINT

摘要

A problem to be solved by the present invention is to provide a flux-containing wire which can obtain a weld metal having excellent low-temperature toughness and which has a high welding efficiency, and which can eliminate or simplify preheating for suppressing low-temperature cracking.The flux built-in wire is made of CaF₂, BaF₂, SrF₂, MgF₂ And LiF, and when the sum of the contents is , the is 2.0 to 7.0% by mass with respect to the total mass of the flux-containing wire, and the content of the Ti oxide, Si oxide, Mg oxide, Al oxide, Zr oxide, and Ca oxide, and when the total content thereof is defined as , The Is in the range of 0.2 to 0.9% by mass with respect to the total mass of the flux-%, And the CaF RTI ID = 0.0 ₂Is 0.90 or more, and the ratio of To the Is 3.0 or more and 15.0 or less.;