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Nuclear island primary device connection tube safe end dissimilar metal welding technology

A welding process and dissimilar metal technology, which is applied in the field of dissimilar metal welding process at the safety end of the main equipment of the nuclear island, can solve the problems of easy porosity, non-fusion, high cost, etc., to ensure successful welding, reduce welding cost, and reliable welding Effect

Active Publication Date: 2012-05-23
SHANGHAI ELECTRIC NUCLEAR POWER EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned existing processes are not only costly, but also prone to welding defects such as pores, slag inclusions, and lack of fusion during actual operation. Therefore, there is an urgent need to improve this type of welding process

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  • Nuclear island primary device connection tube safe end dissimilar metal welding technology
  • Nuclear island primary device connection tube safe end dissimilar metal welding technology

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Embodiment Construction

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0017] see figure 1 , the present invention, that is, a nuclear island main equipment to take over the safety end dissimilar metal welding process, it includes the following steps:

[0018] In the step of selecting the welding groove form, select the groove form of the main equipment connection 1 as a single-sided groove form, and the material of the main equipment connection 1 is 16MND5 low-alloy steel;

[0019] In the stainless steel surfacing step, the stainless steel corrosion-resistant layer 2 is surfacing on the inner wall of the main equipment connecting pipe 1; specifically, before performing the surfacing stainless steel step, it is necessary to clean up the oil, rust oxides, etc. on the inner wall of the main equipment connecting pipe 1 that affect welding quality dirt, and preheated to above 100°C, and then use stainless steel with a width of 25-40mm and ...

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Abstract

The invention relates to a nuclear island primary device connection tube safe end dissimilar metal welding technology which comprises the following steps: selection of form of a welding groove: selecting a single groove form as the groove form of a primary device connection tube; overlay welding of stainless steel: overlay-welding a stainless steel anti-corrosion layer on the inner wall of the primary device connection tube; overlay welding of isolating layer: overlay-welding an isolating layer on the end face of the primary device connection tube by carrying out TIG overlay welding with hot wire to obtain a transition layer and carrying out submerged arc overlay welding to obtain a surface layer; butt welding: butting the safe end with the surface layer at the end face of the primary device connection tube in a submerged arc welding mode; and postweld heat treatment. The invention reduces the welding cost and the labor intensity of welders, and ensures the successful welding of the safe end structure, thereby laying foundation for reliable welding of the safe end and the primary device connection tube.

Description

technical field [0001] The invention relates to a welding technology, in particular to a welding process of dissimilar metals at the safety end of a main equipment of a nuclear island. Background technique [0002] At present, the large containers of the main equipment of the nuclear island of nuclear power plants, such as reactor pressure vessels, steam generators and voltage regulators, are generally made of low-alloy 16MND5 or 18MND5 or SA508Gr.3Cl.1 or SA508Gr.3Cl.2 Steel, and the various pipes connected to the nuclear container are mostly austenitic stainless steel, the material is Z2CND18-12 (nitrogen control) or 316L; in order to ensure the quality of nuclear power equipment, generally on the connection of the nuclear container shell First weld a section of stainless steel pipe (called "safety end"), and then weld the safety end to the stainless steel pipe during on-site installation. Therefore, the above-mentioned process just involves the welding process of the dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/235B23K9/04B23K9/18B23K9/16
Inventor 杨军张茂龙孙志远钱红妹
Owner SHANGHAI ELECTRIC NUCLEAR POWER EQUIP CO LTD
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