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Welding method of nuclear power steam generator

A technology of steam generator and welding method, applied in welding equipment, laser welding equipment, metal processing equipment, etc., to achieve the effects of easy guidance, stable and reliable processing quality, and high power density

Inactive Publication Date: 2018-11-23
SHANGHAI ELECTRIC NUCLEAR POWER EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no application of laser welding to the tube and tube sheet welding of nuclear power steam generators

Method used

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  • Welding method of nuclear power steam generator
  • Welding method of nuclear power steam generator
  • Welding method of nuclear power steam generator

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Experimental program
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Effect test

Embodiment Construction

[0018] The invention uses laser welding instead of argon arc welding to weld the tube plate of the nuclear power steam generator. The example tube is a 690 nickel-based tube, and the material of the tube plate is low-alloy steel, and the nickel-based surfacing layer formed by laser welding is used to fix the connection between the two. The example tube-to-tubesheet joint form is flush.

[0019] The laser energy density is high, and there is a pinhole effect in the welding process, that is, the laser with high power density is incident on the surface of the workpiece, causing the surface temperature of the workpiece to rise rapidly, melt, and vaporize, and form a hole inside the workpiece under the action of vaporization expansion pressure. A small hole around which a molten pool is formed. Therefore, the weld depth-to-width ratio of laser welding is large, which can significantly increase the penetration depth.

[0020] Such as figure 2 As shown, under the traditional weld...

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Abstract

The invention provides a welding method of a nuclear power steam generator. A tube and a tube plate of the nuclear power steam generator are welded through laser welding and the depth-width ratio of awelding seam is large; the fusion depth can be remarkably improved and defect that the root of the welding seam is not fused is effectively eliminated. Compared with traditional tungsten argon arc welding, the local fusion depth of a gap between the tube and the tube plate is improved by 2 times or more in a laser welding process; meanwhile, the welding efficiency is improved by 5 times or more.

Description

technical field [0001] The invention relates to a welding method for a nuclear power steam generator. Background technique [0002] At present, argon tungsten arc welding is widely used at home and abroad for the welding of tube sheets of nuclear power steam generators. However, the gas tungsten arc welding of the tube tube sheet may have defects of root infusion. The inner diameter after welding needs to be investigated in the assessment index of the pipe tube plate weld, so a large welding current cannot be used. The welding current is a key parameter affecting the penetration depth. The penetration depth is not large, and the root of the weld seam is under greater stress. Cracks appear, resulting in unfused roots, such as figure 1 shown. [0003] In addition, there are a large number of tube-tube-sheet joints in nuclear power steam generators (taking CAP1400 steam generator as an example, there are 25,212 tube-tube-sheet joints), and the welding efficiency of argon tun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/14
CPCB23K26/14B23K26/21
Inventor 杨乘东张茂龙鲁艳红茹祥坤唐伟宝
Owner SHANGHAI ELECTRIC NUCLEAR POWER EQUIP CO LTD
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