High intensity gas shielded welding wire, wire rod and application thereof

Abstract

The invention provides a gas protection welding wire rod and a welding wire thereof. Both the wire rod and the welding wire comprises the following elements (according to the weight percent): C is 0.03 to 0.12, Si is 0.30 to 0.80, Mn is 1.2 to 2.2, S is equal to or less than 0.015, P is equal to or less than 0.020, Ni is 0.4 to 1.0, Cr is 0.1 to 0.5, Mo is 0.2 to 0.6, Ti is 0.06 to 0.2, and the rest is Fe and inevitable impurity elements. The welding wire provided by the invention has the advantages of simple chemical element design, small content of the precious alloy elements and low crack sensitivity coefficient, and the deposited metal has the advantages of high intensity, excellent crack resistance and low-temperature shock toughness and excellent dynamic performance. The welding wire of the invention is suitable for the welding of low alloy structure steel with 600 to 800MPa tensile strength, which is applicable to engineering mechanics, heavy trucks, hydraulic power, coal power and other industries.

Description

technical field [0001] The invention belongs to the field of welding materials, and more specifically, the invention relates to gas shielded welding wire materials. Background technique [0002] With its unique advantages, the gas shielded welding process has been widely used in the manufacturing industry in industrialized countries. The development of gas shielded welding technology has greatly improved the manufacturing technology level of the metal structure industry. Gas-shielded solid welding wire is a high-tech welding material. Its production and development adapt to the trend of high-quality, high-efficiency, automated, low-cost, and environmentally friendly welding production. The research and development of gas-shielded solid welding wire in my country began in the 1950s, but it has remained in the research stage for a long time. In the past 10 years, the technology has developed rapidly, but there is still a big gap compared with foreign countries. [0003] Curr...

AI Technical Summary

Problems solved by technology

These high-strength welding wires increase the strength by adding a large amount of precious alloying elements (Ni, Mo, B, Ti, Re, etc.). Although the mechanical properties meet the requirements, the higher alloying element content not only increases the production cost, but also increases the number of cracks. Sensitivity factor, not good for welding

Due to these reasons, there is no mature 700MPa grade gas shielded welding commercial welding wire in my country, which is far from meeting the growing demand for low alloy high strength steel gas shielded welding.

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