High-ductility electrogas welding self-shielded flux-cored wire

Abstract

The invention discloses a high-ductility electrogas welding self-shielded flux-cored wire, which comprises a steel strip and a welding flux wrapped in the steel strip. The weight factor of the welding flux in the overall weight of the wire is 0.2-0.3, and by weight percent, the steel strip comprises 0.01-0.055% of C (carbon), 0.01-0.03% of Si (silicon), 0.10-0.30% of Mn (manganese), 0.005-0.060% of Al (aluminum), 0.007-0.015% of P (phosphorus), 0.007-0.015% of S (sulfur) and the balance Fe (ferrum). By the overall weight of the wire, the wire comprises 2.0-6.0% of fluoride, 1.0-4.0% of oxide, 0.2-1.0% of carbonate, 1.0-4.0% of Mn, 0.2-1.2% of Si, 0.4-2.0% of Ni (nickel), 0.1-1.0% of Mo (molybdenum), 0.05-0.2% of Cr (chromium), 0.05-0.2% of V (vanadium) and the balance Fe. When the wire is used for welding, weld strength is higher than 500MPa, impacting energy at the temperature of -30 DEG C is higher than 50J, and the wire is mainly applicable to occasions of heavy and rapid welding for thick plates.

Description

Technical field [0001] The invention belongs to the field of welding materials and relates to a high-toughness self-shielded flux-cored welding wire for electric welding. Background technique [0002] In the occasion of quick welding of heavy-duty joints of thick plates, such as: steel structure, box-shaped column, heavy-duty structure, reinforcing plate, etc., due to the high efficiency of vertical single-pass welding, the base material is easy to assemble, and the equipment is easy to operate. Long-term welder training, so it has been widely used. The welding material used is low alloy steel self-shielded flux cored wire. Due to the extreme heat input during welding, the welding process performance and the impact toughness of the weld metal are often poor. Meet actual needs. Summary of the invention [0003] In order to overcome the above drawbacks, the present invention provides a high-toughness electric welding self-shielded flux-cored welding wire. The welding wire is matche...

AI Technical Summary

Problems solved by technology

[0002] In the occasion of rapid welding of heavy-duty joints of thick plates, such as: steel structures, box columns, heavy structures, reinforcing plates, etc., due to the high efficiency of vertical and vertical single-pass welding, the easy assembly of the base metal, and easy operation of the equipment, no need Long-term welder training has led to large-scale applications. The supporting welding material is low-alloy steel self-shielding flux-cored wire. Due to the large heat input during welding, the welding process performance and the impact toughness of the weld metal are often poor. meet actual needs

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