Metal powder core welding wire with high toughness and low phase transformation point

Abstract

The invention discloses a metal powder core welding wire with high toughness and a low phase transformation point. The metal powder core welding wire is composed of metal nickel, metal chromium, metalmanganese, silicon iron and metal molybdenum, metal powder is mixed, and the filling rate of the welding wire ranges from 15% to 40%. A welding method of flux-cored wire arc welding is adopted, the welding current ranges from 180 A to 240 A, the welding voltage ranges from 20 V to 26 V, the welding speed ranges from 250 mm / min to 350 mm / min, the welding process of multi-layer and multi-pass welding is adopted, and the interlayer temperature is controlled to range from 100 DEG C to 180 DEG C. 80%-98% of Ar and 2%-20% of CO2 are adopted as protective gas. According to the problems that the toughness of common low-phase-transformation welding material deposited metal is low and the actual engineering application requirement cannot be met, by means of the technical scheme, postwelding stressrelief treatment is not needed, and the metal powder core welding wire is high in deposition rate, high in toughness, resistant to fatigue and low in phase transformation.

Description

technical field [0001] The invention relates to a welding wire, more specifically, to a metal powder-cored welding wire with high toughness and low transformation point. Background technique [0002] In today's industrial manufacturing process, welding has become one of the most widely used connection technologies, and many of the most important metal structures in the contemporary era are completed by welding. The uneven temperature field during the welding process and the local plastic deformation caused by it, the difference in specific heat capacity between the welding material and the base metal, the thermal shrinkage during the cooling process of the deposited metal, and the complex welding structure will all cause a large weld toe of the welded joint. The residual tensile stress seriously reduces the fatigue strength of the welded structure. In order to prolong the fatigue life of the welded structure, it is often necessary to perform post-weld treatment such as: pos...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a metal powder-cored welding wire with high toughness and low phase transition point, that is, for ordinary low phase transition (LTT) welding materials, the deposited metal has low toughness and cannot meet the actual engineering application The problem required is to provide a high toughness anti-fatigue and low phase change metal powder cored wire with high deposition rate and no need for post-weld stress relief treatment

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