Gas shielded arc welding wire for high-tensile structural steel

Abstract

The invention discloses a gas protection welding wire used for a high strength structural steel, which belongs to the welding wire technical field. The invention has the technical proposal that the welding wire comprises following elements with weight percentage such as 0.04 to 0.12 parts of C, 1.20 to 2.20 parts of Mn, 0.40 to 0.90 parts of Si, 0.03 to 0.20 parts of Ti, 0.03 to 0.06 parts of V, 0.002 to 0.006 parts of B, less than or equal to 0.025 parts of S, less than or equal to 0.025 parts of P and unavoidable impurities with iron surplus. Through experimenting, the welding wire is applied to weld the high strength structural steel, the microalloying of a weld seam can be realized, the generation of cold crack phenomenon generated by the weld seam is prevented; and the preheating is not required during the welding process, the operating environment of a welder is improved, and the welding cost is reduced, a crystal grain of the weld seam during the welding process is rather fine, the obdurability of the weld seam is improved, the splashing degree is reduced during the welding process, and the production cost of each ton can be reduced by more than RMB 10000 yuan.

Description

technical field [0001] The invention belongs to the field of welding wire technology, in particular to a gas-shielded welding wire for high-strength structural steel specially used for welding low-alloy high-strength steel. Background technique [0002] Low-alloy high-strength steel is a steel with excellent low-temperature impact toughness and high strength. It has the advantages of reducing material consumption, reducing structural weight, and improving structural performance and safety. Therefore, it has been used in construction machinery, railway bridges, marine facilities and high-pressure Containers and other projects are widely used. The tensile strength of this kind of steel is about 600Mpa, but the welding wire matching the welding strength of this kind of steel is very scarce. At present, when welding the above-mentioned low-alloy high-strength steel, either Er55 series welding wire with a strength of 550-560Mpa is used, and the strength of the joints welded by t...

AI Technical Summary

Problems solved by technology

Contains a high content of the precious metal nickel in this welding wire, thus greatly increasing its cost

In addition, when using this welding wire to weld low-alloy high-strength steel, due to the problem of alloy ratio, there is still a problem that the low-alloy high-strength steel to be welded must be preheated at a temperature above 150°C and the weld is still prone to cold. crack defect