A cladding installation method and welding process of duplex stainless steel pool in nuclear power plant

Abstract

The invention discloses a surface-covered mounting method for a dual-phase stainless steel water tank of a nuclear power station and a welding process, and belongs to the technical field of nuclear power station building. Wall surface covering adopts modularized manufacturing and mounting, and a reasonable wall surface-covered mounting sequence, so that mounting deformation of a surface-covered plate of the stainless steel water tank is reduced, and efficiency is improved; bottom plate surface-covering is performed after a wall surface is covered and is put in place, a bottom plate is fixed through rigidity of a pre-embedded plate, and a reasonable welding process sequence is adopted, so that effective control on bottom plate welding deformation can be realized; in a water tank mounting and welding process, an FCAW automatic or semi-automatic welding process greatly improves construction efficiency, and the construction period is shortened. The mounting method for the dual-phase stainless steel water tank of THE nuclear power station and the FCAW automatic or semi-automatic welding process are suitable for surface-covered mounting of a large dual-phase stainless steel water tank of the nuclear power station and a medium-thickness steel plate with a similar structure.

Description

technical field [0001] The invention relates to the technical field of installation of nuclear power stainless steel pools, in particular to a cladding installation method and welding process for duplex stainless steel pools in nuclear power plants. Background technique [0002] The large-scale advanced pressurized water reactor CAP1400 nuclear power plant duplex stainless steel pool is composed of walls and bottom plates, and the steel cladding is made of duplex stainless steel with a thickness of 14-25mm. The wall and bottom plate are large in size and complex in structure. Unreasonable installation and welding sequences can easily cause the deformation of the pool to be out of tolerance and affect the use of the pool. At the same time, due to the thick cladding plate and large amount of welding filler, the traditional manual arc welding process not only needs to invest a large number of highly skilled welders for construction, but also the welding quality is not easy to g...

AI Technical Summary

Problems solved by technology

The size of the wall and bottom plate is large and the structure is complex. Unreasonable installation and welding sequence can easily cause the deformation of the pool to be out of tolerance and affect the function of the pool.

At the same time, due to the thick cladding plate and the large amount of welding filler, the traditional manual arc welding process not only requires a large number of highly skilled welders to carry out construction, but also the welding quality is not easy to guarantee, which affects the construction efficiency and construction quality

The invention patent "Nuclear Power Plant Stainless Steel Pool Overlay Welding Structure and Automatic Welding Method" (authorized announcement number: CN103280251B) provides an automatic welding method for nuclear power stainless steel pools, but the welding method is TIG automatic welding, and its welding efficiency is low. Suitable for stainless steel pool welding with thin plate cladding

The invention patent "A Method for On-Site Horizontal Welding of Duplex Stainless Steel" (authorized announcement number: CN106001859A) discloses a method for on-site horizontal welding of duplex stainless steel. The method is a combination of argon arc welding and manual welding. Higher requirements and lower welding efficiency

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