Flux cored wire for gas shielded arc welding

Abstract

A wire containing flux for gas shield arc welding in which a steel casing is filled with flux, wherein: the wire contains BaF2, C, Si, Mn, Al, Mg, Ni, Zr, Fe, and Li in prescribed amounts per total mass of wire; and the value expressed by BaF2 content / (Al content+Zr content) is 2.1-20.0.

Description

technical field [0001] The invention relates to a gas-shielded arc welding flux-cored welding wire. More specifically, it relates to a gas-shielded arc welding flux-cored wire applicable to welding in all postures including a vertical posture. Background technique [0002] In the fields of marine structures and line pipes, the deep water in the sea area where energy resource development is carried out, the expansion of resource exploration and mining areas for extreme sea areas such as the Arctic Ocean, and the enlargement of equipment are in progress. Against the background of such technological trends, in the design of offshore structures and line pipes, higher strength and higher toughness are promoted, and the performance requirements for welded joints are also becoming more stringent. [0003] On the other hand, regarding welding materials, flux-cored wires for all-position welding are required from the viewpoint of high efficiency. In addition, high fracture toughnes...

AI Technical Summary

Problems solved by technology

[0009] However, in the technology disclosed in Patent Document 1, the level of strength of the weld metal is not high (Table 2 of Patent Document 1), and it is difficult to say that the performance required for structural materials in the fields of marine structures and line pipes is not sufficiently satisfied at present.

In addition, in Patent Document 1, the temperature for evaluating impact performance (toughness) is high (Table 2 of Patent Document 1), and the weld metal obtained by the technique disclosed in Patent Document 1 cannot be judged to be excellent in low-temperature toughness.

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