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Automatic tempering surfacing welding method for pipeline maintenance

An automatic tempering and pipeline technology, which is applied in applications, household appliances, welding equipment, etc., can solve the problems that the organization and performance cannot be effectively improved, and the workload of finishing weld grinding will be increased, so as to reduce the grinding workload and improve Microstructure and performance, the effect of enhancing the tempering effect

Active Publication Date: 2017-09-22
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] The purpose of the present invention is to overcome the deficiencies of the prior art, provide an automatic tempering surfacing method for pipeline maintenance, and solve the heat-affected zone of the low-alloy steel side of the dissimilar metal joint in nuclear power dissimilar metal joint pipeline surfacing maintenance The structure and performance cannot be effectively improved, and the existing reinforced weld structure increases the workload of the finished weld grinding

Method used

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  • Automatic tempering surfacing welding method for pipeline maintenance
  • Automatic tempering surfacing welding method for pipeline maintenance
  • Automatic tempering surfacing welding method for pipeline maintenance

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Embodiment 1

[0063] Such as Figure 2-5 Shown, the present invention is a kind of automatic tempering surfacing welding method for pipeline maintenance, as figure 2 As shown, in the maintenance of the regulator pipeline, the Inconel600 pre-stack 7 is connected to the end face of the low-alloy steel pipe section 6 by surfacing welding; the Inconel600 pre-stack 7 and the stainless steel transition pipe 9 are connected by welding to form Inconel600 weld 8; stainless steel transition pipe 9 and stainless steel pipe section 11 are connected by welding to form stainless steel weld 10, forming dissimilar metal joints on Inconel600 weld 8 and stainless steel weld 10 requires maintenance of the pipeline annulus;

[0064] The tempered surfacing layer 12 is surfacing on the low alloy steel pipe section 6, Inconel600 pre-stacking edge 7, Inconel600 weld 8, stainless steel transition pipe 9, stainless steel weld 10, stainless steel pipe section 11 by welding; the transition surfacing layer 13 is The ...

Embodiment 2

[0103] Such as Figure 2-5 Shown, a kind of automatic tempering surfacing welding method that is used for pipeline maintenance of the present invention, the surfacing welding of automatic tempering surfacing welding process technology can be divided into following 5 steps and finish, specifically as follows:

[0104] Step 1: Temper Overlay Welding

[0105] The welding adopts the automatic argon arc welding method; the welding adds ERNiCrFe-7A nickel-based alloy welding wire; the welding layer / inter-pass overlap is carried out according to the patent; the welding line energy is controlled between 0.7KJ / mm~1.0KJ / mm; The wire feeding speed is controlled within the range of 500mm / min to 700mm / min, and the interlayer temperature is controlled within the range of 60°C to 70°C.

[0106] Step 2: Transition surfacing welding

[0107] The welding line energy of the transition surfacing layer is controlled within the range of 0.9KJ / mm~1.2KJ / mm, and ERNiCrFe-7A nickel-based alloy weldin...

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Abstract

The invention discloses an automatic tempering surfacing welding method for pipeline maintenance. The method comprises the steps of 1, tempering surfacing welding layer welding, wherein a tempering surfacing welding layer is welded to the ring surface of a to-be-maintained pipeline of a dissimilar metal joint, and in the tempering surfacing welding layer welding process, welding is conducted in a layer welding manner, and then a bead overlapping manner is adopted for welding; 2, transition surfacing welding layer welding, wherein a transition surfacing welding layer is welded to the tempering surfacing welding layer in a surfacing welding manner; 3, reinforcing tempering welding bead welding, wherein tempering welding is conducted on the two ends of the tempering surfacing welding layer and the two ends of the transition surfacing welding layer; and 4, polishing, wherein after welding is completed, reinforcing welding seams are polished to required sizes. On the one hand, structure and performance of a heat-affected zone on the low alloy steel side of the dissimilar metal joint of a nuclear power device can be effectively improved, and postweld heat treatment is not conducted after surfacing welding maintenance is conducted; on the other hand, according to the designed reinforcing welding seam structure form, not only can the tempering effect of the two ends of a workpiece be improved, but also the polishing working load of completed welding seams is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of nuclear power welding, in particular to an automatic tempering surfacing method for pipeline maintenance. Background technique [0002] The voltage stabilizer is one of the five main equipments of the nuclear power plant. The weld seam at the safety end of the voltage regulator is the pressure boundary of the primary circuit connecting the voltage regulator and the takeover. Inconel-600 material was widely used in dissimilar metal welds of safety terminal tubes of early nuclear power plant regulators. In the use of Inconel-600 nickel-based alloy in nuclear power plants at home and abroad, it is found that the alloy material has a high sensitivity to SCC in the primary circuit of high-purity water; at the same time, a large number of foreign nuclear power plant maintenance cases show that Inconel-600 dissimilar metal welding during the life of the nuclear power plant Seams are prone to crack failure. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23P6/04B23K101/06
Inventor 叶义海王建罗绪珍王晓敏王理付荣真胡建群李红军何子昂薛敬凯林方强
Owner NUCLEAR POWER INSTITUTE OF CHINA
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