Flux cored wire for gas shielded arc welding

Abstract

The invention provides a flux cored wire for gas shielded arc welding, and the wire can enable splashing generation to be reduced, cannot damage the arc stability and the mechanical property of a welding metal, inhibits the sinking of a welding bead, and irons out the defect that the welding slags are carried secretly. The wire is characterized in that the wire is formed by that the interior of a steel sheath contains flux; according to the total mass of the wire, the content of TiO2 is 0.2-0.9 % of the total mass of the wire, the content of Ti is 0.005-0.040% of the total mass of the wire, the content of C is 0.01-0.05% of the total mass of the wire, the content of Mn is 1.5-4.0% of the total mass of the wire, the content of the sum of a Zr compound, the Zr equivalent value of a Zr oxide and metal Zr is from 0.5-2.0% of the total mass of the wire, the content of the sum of an Si compound, the Si equivalent value of an Si oxide and metal Si is from 0.5-2.0% of the total mass of the wire, the content of the sum of a B compound, the B equivalent value of a B oxide and metal B is from 0.002-0.010% of the total mass of the wire, and 0.74.[Ti] / ([TiO2].[Zr]) is within the range from 0.005 to 0.040, wherein the [Zr] is the sum of the Zr compound, the Zr equivalent value of the Zr oxide and metal Zr, [B] / [Mn] is within the range from 0.001 to 0.005, and [B] is the sum of the B compound, the B equivalent value of the B oxide and metal B.

Description

technical field [0001] The present invention relates to a flux-cored welding wire mainly used for welding steel structures such as shipbuilding and bridges, in particular to a high-efficiency flux-cored welding wire suitable for transverse welding. Background technique [0002] Conventionally, gas-shielded arc welding using a flux-cored wire has been practiced in various fields in order to perform welding operations efficiently. For example, among the flux-cored wires capable of efficiently performing fillet welding, gas-shielded welding flux cores that can obtain good welding workability and excellent porosity resistance especially in high-speed welding of primer-coated steel sheets are disclosed. Welding wire (for example, refer to Patent Document 1). [0003] In the fields of shipbuilding and bridges, it is common to apply a primary antirust paint to the surface of a steel material as a base material for welding for the purpose of preventing rust during manufacture. Pat...

AI Technical Summary

Problems solved by technology

However, with only the composition system described in Patent Document 1, there is room for poor fusion caused by slag entrapment and improvement of mechanical properties of the weld metal in transverse welding.

[0008] In addition, when a slag forming agent exhibiting a high melting point is actively added to a conventional flux-cored wire, droplet transfer tends to be disordered, the amount of spatter to be generated increases, and the mechanical properties of the weld metal tend to deteriorate.

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