Gas shield welding wire

Abstract

The invention relates to a gas shield welding wire used for high-grade pipelines resistant to compression, impact and corrosion. The cold cracking sensitivity index Pcm of the welding wire is computed according to the following formula: Pcm=C+Si / 30+(Mn+Cu+Cr) / 20+Ni / 60+Mo / 15+V / 10+5B and ranges from 0.15% to 0.25%. The welding wire is formed by the chemical components such as Cr, Ni, Mo, Ti, V and B, other elements such as Mn, Si and P, the balances Fe and S and other inevitable inclusion, wherein the total weight percentage of the alloys Cr, Ni, Mo, Ti, V and B is controlled between 0.6% and 1.2%; and the weight ratio of Mn to Si to P is 1.7-4.0 according to Mn / (Si+P). The welding wire has high strength matching high strength, high pressure and high required joint properties of the high-grade pipelines, high low-temperature impact absorbing energy, stable welding arc and excellent all-position welding processing property.

Description

technical field [0001] The invention relates to a gas-shielded welding wire material for metal material welding, in particular to a gas-shielded welding wire for high-grade pipelines that is resistant to compression, impact and corrosion. Background technique [0002] At present, my country's machinery industry and transportation industry are in a period of rapid development. With the continuous improvement of the strength and toughness of new steel types for construction machinery, there is a large gap between the strength and toughness of existing welding wire welds and base materials. my country imports them every year. A large number of high-strength series welding materials meet the needs of other protective welding materials in industries such as construction machinery, oil pipelines, pressure vessels, automobile manufacturing, military ships and other new generation high-performance engineering structural steels. Pipeline steel is currently developing relatively fast an...

AI Technical Summary

Problems solved by technology

The Chinese Patent Publication No. CN1043680 introduces a patent for "welding wire". The welding wire material uses CO2 gas for shielded welding. Although the tensile strength of the deposited metal can reach 800Mpa, it has low temperature impact toughness. However, it is very low and cannot meet the applicable requirements of welding steel and low-temperature service; Japanese patent P2000-218391A introduces a gas shielded welding wire. The welding metal of this welding wire has good low-temperature impact toughness, but the disadvantage is the tensile strength Can not reach 700Mpa stably; Chinese Patent Publication No. CN1413795A "ultra-low carbon high-strength gas shielded welding wire material" patent, although its welding wire can be used with high-strength steel of 700-800Mpa, but its disadvantage is that the Ni content is high, and the welding wire It is easy to break during the drawing, and the problem of corrosion resistance cannot be solved

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