A high-strength high-toughness weather-resistant gas protection welding wire for steel

Abstract

The invention provides a high-strength high-toughness weather-resistant gas protection welding wire for steel. The welding wire steel comprises, in weight percentage, 0.03%-0.11% of C, 0.70%-1.50% of Mn, 0.25%-0.90% of Si, 0.55%-1.40% of Ni, 0.15%-0.45% of Cu, 0.05%-0.18% of Ti, not more than 0.015% of S, and not more than 0.020% of P, the balance being iron and inevitable impurities. The welding wire is used for the welding of steel of the 550 MPa strength grade; the welding wire steel smelting process is stable and easy to implement, and the technical requirements for welding high-strength, high-toughness and high-weather resistance steel are met. The gas protection welding wire has excellent welding process properties, has the advantages of stable welding arcs, less splatter, zero gas pores and artistic formation and is suitable for all-position welding.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a gas-shielded welding wire for welding high-strength, high-toughness and high-weather-resistant steels. Background technique [0002] The gas shielded welding method is widely used in important structures such as vehicles, ships, railway bridges, engineering machinery, and pressure vessels due to its advantages such as low welding cost, energy saving, high production efficiency, good welding processability, easy automation, and good weld quality. Manufacturing of parts. In recent years, with the continuous development of smelting technology and the application of controlled rolling, controlled cooling and microalloying elements, the properties of steel are developing towards high strength, high toughness and high weather resistance, so as to reduce material consumption and lighten the structure. Weight, improve structural performance, safety and service life. The production of...

AI Technical Summary

Problems solved by technology

It is a weather-resistant gas-shielded welding wire specially used for welding the bogie frames of CRH3 EMUs. It solves the problems that the weather-resistant gas-shielded welding wires of high-speed train bogies in the prior art have always been dependent on imports and the cost is high. The welding wire has certain weather resistance , but only suitable for welding of steels with strength lower than 500MPa

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