Method for performing stainless steel strip-electrode submerged-arc build-up welding on low-alloy parent steel

Abstract

The invention relates to a method for performing stainless steel strip-electrode submerged-arc build-up welding on low-alloy parent steel. The method comprises the following steps: S1, performing preheating before welding, and performing first-layer stainless steel strip-electrode submerged-arc build-up welding on a surface to be subjected to build-up welding, of the low-alloy parent steel, so as to form a first stainless steel build-up welding layer; S2, performing post-heating treatment; S3, performing second-layer stainless steel strip-electrode submerged-arc build-up welding and third-layer stainless steel strip-electrode submerged-arc build-up welding on the first stainless steel build-up welding layer so as to form a second stainless steel strip-electrode submerged-arc build-up welding layer and a third stainless steel strip-electrode submerged-arc build-up welding layer; and S4, performing postwelding heat treatment. According to the method, the thicknesses of hardening layers of transition regions of stainless steel strip-electrode submerged-arc build-up welding joints are effectively controlled by controlling preheating temperature, interlayer temperature, welding currents, welding voltages, welding speed, temperature of post-heating treatment, time of post-heating treatment, temperature of postwelding heat treatment and time of postwelding heat treatment, so that the thicknesses of the hardening layers are reduced by over 50%; the bonding strength of the build-up welding layers and the parent steel is improved; the problem that in the prior art, a stainless build-up welding layer on the low-alloy parent steel can crack, and even be stripped off, at a stainless steel strip-electrode submerged-arc build-up welding joint is solved.

Description

technical field [0001] The invention relates to a method for carrying out submerged arc surfacing welding of stainless steel strips on a low-alloy steel parent material, which is used for controlling the thickness of a hardened layer in a transition zone at a welded joint, and belongs to the field of welding technology. Background technique [0002] The steam generator is the main equipment of the nuclear island, and the heat generated by the nuclear fuel is conducted from the circuit containing radioactive coolant to the steam circuit driving the steam turbine through the steam generator. Since the high temperature and humid steam has a corrosive effect on the inner surface of the steam generator, the safety performance of the steam generator is of great significance to the safe operation of the nuclear power plant; therefore, in order to improve the corrosion resistance of the inner surface of the steam generator, the steam For the service period of the generator, it is ne...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for carrying out submerged arc surfacing welding of stainless steel strip on the base material of low alloy steel, which overcomes the problem of welding joints of submerged arc surfacing welding of stainless steel strip on the base material of low alloy steel in the prior art. The problem of cracking or even peeling of the stainless steel surfacing layer occurs, and the thickness of the hardened layer in the transition zone of the stainless steel strip submerged arc surfacing welding joint is effectively controlled

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