Flux-cored wire for electrogas welding

Abstract

The invention discloses a flux-cored wire for electrogas welding, which comprises a steel strip and welding flux wrapped in the steel strip. The weight coefficient of the welding flux in the overall weight of the wire ranges from 0.2 to 0.3. By weight percentage, the steel strip comprises 0.010-0.055% of C (carbon), 0.01-0.03% of Si (silicon), 0.10-0.30% of Mn (manganese), 0.005-0.060% of Al (aluminum), 0.007-0.012% of P (phosphorus), 0.007-0.012% of S (sulfur) and the balance Fe (ferrum). By the overall weight of the wire, the welding flux comprises 0.2-2.0% of fluoride, 0.2-1.0% of oxide, 1.0-3.0% of Mn, 0.2-1.0% of Si, 0.4-1.2% of Ni (nickel), 0.1-1.0% of Mg (magnesium), 0.002-0.16% of Ti (titanium), 0.002-0.010% of B (boron) and the balance Fe. The flux-cored wire matched with electrogas welding is used for welding, so that welding efficiency is greatly improved, and excellent and stable mechanical performance is also obtained.

Description

technical field [0001] The invention belongs to the field of welding materials, and relates to a gas-electric vertical welding flux-cored welding wire. Background technique [0002] Gas-electric vertical welding (EGW for short) technology was introduced into my country in the mid-1980s. Gas-electric vertical welding is a fully automatic control rising system, equipped with special flux-cored wire, and CO 2 Gas protection is used for vertical butt welding, welding joints in vertical or near vertical positions, and the direction of the arc axis is perpendicular to the direction of weld penetration. During welding, a water-cooled copper slider is used on the front of the weld, and a water-cooled row (or liner) is used on the back of the weld. The flux-cored wire is fed into the groove formed by the weldment and the block, and the four sides of the molten pool are constrained. Realize single-sided welding and double-sided forming at one time. Using this method, the welding eff...

AI Technical Summary

Problems solved by technology

Using this method, the welding efficiency can be increased by about 600%. Therefore, it is widely used for butt welding of shell partitions and cargo compartments of ships and various internal components, side plates of storage tanks, and box girder doubler plates of bridges for vertical welding. When welding, because it is done together, the input of welding heat is extremely large, which greatly affects the mechanical properties, so that it cannot meet the needs of production or life.

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