Gas-shielded flux-cored welding wire for arc welding

Abstract

A gas-shielded flux-cored wire for arc welding, characterized in that the flux core composition includes the following components and mass percentages: TiO2? 20-22%, SiO21-4%, ZrO21-2.5%, Al2O31-3%, MgO ? 1.5%, AlF35~9%, NiF25~6%, Na2SiF61~6%, Ti3Al? 3~4%, Fe3Al4~6%, Co1~2%, the balance is Fe. The flux-cored welding wire of the present invention has excellent technological properties such as low hydrogen content in weld metal diffusion, small spatter, and few defects such as pore cracks, and the welded joint has excellent low-temperature impact toughness and excellent corrosion resistance, and is especially suitable for marine engineering equipment Welding of high-strength steel with a yield strength of 700MPa in the manufacturing industry.

Description

technical field [0001] The invention relates to a gas-shielded flux-cored welding wire for arc welding, in particular to a flux-cored welding wire for high-strength grade steel material arc welding. Background technique [0002] As a new generation of high-efficiency and high-performance welding materials, flux-cored wire has the advantages of good process performance, fast deposition speed, and high production efficiency. It is widely used in various welding fields of industrial manufacturing. Highest. At present, most flux-cored welding wires use rutile as the main slag forming material, and become rutile slag-based flux-cored welding wires, which have the advantages of good molding, easy slag removal and small spatter, and can realize horizontal, upward, downward, vertical Welding to the full position. At present, most of the flux-cored wires that can realize all-position welding belong to the rutile slag system, but the Ti in the rutile slag-based flux-cored wire will ...

AI Technical Summary

Problems solved by technology

However, in its application example, its yield strength evaluation value is only 620MPa, which cannot realize the welding of 700MPa grade high-strength steel in marine equipment manufacturing

[0004] CN102785041A discloses an all-position alkaline gas shielded flux-cored welding wire, which uses CaO, MgO, K 2 O and Na 2 Oxide, CaF 2 、LiF 2 , SrF 2 and BaF 2 Such as fluoride, and alloying elements such as aluminum-magnesium alloy, manganese and silicon, and the rest are filled with iron powder. Meet the welding requirements of 700MPa high-strength steel in offshore equipment manufacturing

The existing flux-cored welding wire can only be used as a high-efficiency welding material for common steel types, and cannot fully meet the welding requirements of marine steel

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