| 摘要 |
PROBLEM TO BE SOLVED: To provide a flux cored wire which is capable of improving a welding speed to, for example, 1m/min in horizontal fillet welding by a single electrode, has an excellent bead shape and fit and has excellent welding workability even in vertical up welding by the single electrode. SOLUTION: This flux cored wire for gas shielded arc welding contains, by total weight of the wire, 1.5 to 3.5wt.% Ti and Ti compd. (value in terms of Ti), 0.2 to 0.5wt.% Zr and Zr compd. (value in terms of Zr), 0.5 to 1.2wt.% Si and Si compd. (value in terms of Si), 2.0 to 3.0wt.% Mn and 0.02 to 0.1wt.% C. The value expressed by the mathematical expression ([Ti]/[Zr]) is 5 to 12 and the value expressed by the mathematical expression (2×[Zr]+[Si]) is 1.1 to 1.9 when the value in terms of Ti of the Ti and Ti compd. is defined as [Ti] by weight %, the value in terms of Zr of the Zr and Zr compd. as [Zr] by weight % and the value in terms of Si of the Si and Si compd. as [Si] by weight %.
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