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Surfacing repair method for dissimilar metal pipeline of safety end of voltage stabilizer in nuclear power station

A technology of dissimilar metals and voltage stabilizers, applied in metal processing, arc welding equipment, metal processing equipment, etc., can solve the problems of complex surfacing layer structure, unfavorable improvement of stress state, complex stress state of surfacing layer, etc. The effect of integrity and mechanical consistency, reducing the contact interface of dissimilar metals, and reducing the difficulty of on-site surfacing maintenance

Active Publication Date: 2016-09-21
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the increase of the transition layer, the structure of the surfacing maintenance process is complicated, which leads to the following three deficiencies: first, the complex structure leads to a complex internal stress state of the surfacing layer, which is not conducive to improving the stress state; second, the structure of the surfacing layer Complicated, and its maintenance surfacing process is also relatively complicated, which is not conducive to the quality control of on-site maintenance construction; third, the maintenance process is complicated and the construction is difficult, which is not conducive to on-site maintenance progress control and radiation dose control

Method used

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  • Surfacing repair method for dissimilar metal pipeline of safety end of voltage stabilizer in nuclear power station
  • Surfacing repair method for dissimilar metal pipeline of safety end of voltage stabilizer in nuclear power station
  • Surfacing repair method for dissimilar metal pipeline of safety end of voltage stabilizer in nuclear power station

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Experimental program
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Effect test

Embodiment

[0031] A method for repairing dissimilar metal pipelines on the safe end of a nuclear power regulator includes the following steps:

[0032] Excavate the stainless steel weld 5 on the weld between the transition pipe section 4 and the pipe section 6, and repair the stainless steel weld 5, and polish the repair weld to be flush with the pipe section 6;

[0033] On the low-alloy steel pipe section 1, the pre-stacked edge 2, the pre-stacked edge weld 3, and the pipe section 6, the nickel-based alloy surfacing layer 8 is surfacing, and it becomes like image 3 The surfacing structure shown.

[0034] When digging out stainless steel welds, mechanical methods such as grinding wheels are used to polish the surface of the stainless steel welds and form a circumferential groove with a certain depth and width. The width is increased by 2mm to 4mm on the basis of the width of the stainless steel welds. The depth is 2mm~3mm.

[0035] Stainless steel weld groove repair welding process method: ado...

example

[0046] Example: The entire surfacing layer welding includes the following five steps:

[0047] Step 1: Stainless steel weld groove repair welding

[0048] Stainless steel weld groove repair welding adopts pulse automatic argon arc welding method, welding peak current is 250A, base current is 190A, pulse ratio is 0.2s:0.2s, arc voltage is 11.5V, rotation speed is 140mm / min, wire feeding speed The rotation is 2400mm / min, the welding gun gas is 0.35MPa, and the temperature between layers is controlled below 180℃.

[0049] Step 2: Stainless steel weld groove repair welding weld grinding

[0050] Using mechanical grinding method, the stainless steel weld groove repair welding seam is ground to be flush with the original base material.

[0051] Step 3: Weld the first three layers

[0052] The first three layers are welded using tempering welding technology, the peak current is 180A, the base current is 120A, the pulse ratio is 0.2s:0.2s, the arc voltage is 10.2V, the rotation speed is 140mm / m...

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Abstract

The invention discloses a surfacing repair method for a dissimilar metal pipeline of a safety end of a voltage stabilizer in a nuclear power station. The surfacing repair method comprises the following steps: depositing a stainless steel cladding layer on the inner wall of a low-alloy steel pipe section; surfacing a buttering layer onto the end surfaces of the low-alloy steel pipe section and the stainless steel cladding layer; enabling the buttering layer and a transition connection pipe to form a U-shaped groove, and connecting the two parts in a welding manner to form a buttering weld; excavating out a stainless steel weld from a weld between the transition pipe section and the pipe section, carrying out repair welding on the stainless steel weld, and polishing a repair welding weld to enable the repair welding weld to be level with the pipe section; and surfacing a nickel-based alloy surfacing layer on the low-alloy steel pipe section, the buttering layer, the buttering weld and the pipe section. With the adoption of the method, the stress state of the surfacing layer is improved, the surfacing repair process is simplified, the field surfacing repair difficulty is lowered, and safe, reliable and efficient surfacing repair for a dissimilar metal joint of the safety end of the voltage stabilizer is realized.

Description

Technical field [0001] The invention relates to the field of nuclear power dissimilar metal joint pipeline surfacing welding, in particular to a maintenance method for dissimilar metal pipeline surfacing welding for the safe end of a nuclear power stabilizer. Background technique [0002] Voltage stabilizer is one of the five main equipment of nuclear power plant. The weld on the safety side of the regulator is the pressure boundary of the primary circuit connecting the regulator and the pipe. Inconel-600 material was widely used in the dissimilar metal welds of the safety terminal of the early nuclear power plant regulator. In the use of Inconel-600 nickel-based alloy in nuclear power plants at home and abroad, it has been found that the alloy material has a high sensitivity to SCC in high-purity water in the primary circuit. 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 nu...

Claims

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Application Information

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IPC IPC(8): B23K9/04B23K9/235B23K101/06B23K103/08
CPCB23K9/048B23K9/235B23K2101/06B23K2103/08
Inventor 罗绪珍叶义海王建陈学德许峰潘晓冬李红军
Owner NUCLEAR POWER INSTITUTE OF CHINA
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