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Strip electrode electroslag surfacing process of nickel-based alloy of tube plate of nuclear power steam generator

A technology of steam generators and nickel-based alloys, applied in arc welding equipment, metal processing equipment, manufacturing tools, etc., which can solve the problems of low plasticity and toughness of the surfacing layer, uneven depth of fusion, and high dilution rate of the base metal. Achieve the effects of improving quality, high deposition efficiency, and improving production efficiency

Inactive Publication Date: 2010-08-11
SHANGHAI ELECTRIC NUCLEAR POWER EQUIP CO LTD
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Problems solved by technology

However, there are still some deficiencies in the strip submerged arc surfacing process, such as low deposition efficiency; uneven depth of penetration, high dilution rate of base metal, generally greater than 20%; prone to slag inclusion, surface quality unevenness greater than 1mm, the surfacing surface needs to be machined; the plasticity and toughness of the surfacing layer are low

Method used

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  • Strip electrode electroslag surfacing process of nickel-based alloy of tube plate of nuclear power steam generator
  • Strip electrode electroslag surfacing process of nickel-based alloy of tube plate of nuclear power steam generator

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Embodiment Construction

[0023] In order to better understand the technical solution of the present invention, it will be described in detail below through specific embodiments in conjunction with the accompanying drawings:

[0024] The electroslag surfacing process of the nickel-based alloy strip electrode of the nuclear steam generator tube plate of the present invention comprises the following steps:

[0025] 100% magnetic particle inspection is used for the surface inspection before surfacing;

[0026] In the preheating step, the preheating temperature is ≥121°C and is maintained until the post-heat treatment;

[0027] For surfacing welding steps, the welding material (strip and flux) is EQNiCrFe-7A welding strip / flux from SMC Company of the United States, the welding strip is INCONEL WELDSTRIP 52M, the flux is INCOFLUX ESS2, and the size is 60×0.5mm; welding current 1150±100A, voltage 24~26V, welding speed 200~220mm / min, current polarity reversed, welding bead overlap 7~8mm, interlayer temperatu...

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Abstract

The invention discloses a strip electrode electroslag surfacing process of nickel-based alloy of a tube plate of a nuclear power steam generator, which comprises the following steps of: detecting the surface before surfacing; preheating; carrying out surfacing welding; carrying out post-heat treatment; polishing the surface of a surfacing layer; and detecting the surface after surfacing. When used for large-area surfacing of the tube plate, the strip electrode electroslag surfacing process can greatly improve the quality of the surfacing layer, reduce the surfacing time of the nickel-based alloy of the tube plate, quicken the proceeding of subsequent procedures, increase the production efficiency of the whole steam generator manufacturing, and shorten the manufacturing period.

Description

technical field [0001] The invention relates to a welding process, in particular to a nickel-based alloy strip electroslag surfacing process for a nuclear power steam generator tube plate. Background technique [0002] Nickel-based alloy surfacing welding of nuclear power steam generator tube plate is the first part to be carried out in the whole steam generator manufacturing process, and it is also one of the most demanding and difficult key processes. The nickel-based alloy materials used for surfacing welding of steam generator tube sheets are relatively special, have poor weldability, and require high surfacing quality. Therefore, the welding of this part is not only difficult, but also puts forward higher requirements on the quality and efficiency of surfacing welding. At present, the available mature surfacing welding processes mainly include gas metal shielded welding, hot wire plasma arc surfacing, hot wire tungsten argon arc welding, etc. For welding, the welding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04
Inventor 张茂龙李双燕陈佩良孙志远
Owner SHANGHAI ELECTRIC NUCLEAR POWER EQUIP CO LTD
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