Stainless steel water tank for nuclear power station and welding method

Abstract

The invention discloses a stainless steel water tank for a nuclear power station and a welding method. The MIG semi-automatic welding is adopted for the welded weld joints: the electric arc burnt between the continuously-fed welding wire and the workpiece is used as a heat source, the welding wire is molten by the electric arc and is sent into the welding area, and the arc is protected by the protective gas sprayed out by a welding torch nozzle; the diameter of the welding wire is 0.8-1.2mm, the welding current is 42 -90 A, the arc voltage is 18-24 V, and the protective gas flow is 10-15 L / min, and the temperature between the layers is 5 DEGC <=T<=150 DEG C; the protective gas is the mixed gas of argon and helium, and the content ratio of the argon to helium is 15-20:85-80. The stainless steel water tank adopts MIG semi-automatic welding. Meanwhile, the fillet welding joints of the installation of an accessory structure, an anchor rib assembly pair, an anchor rib assembly, a top platepair, welded nails, a shooting plate groove pair, and a cover plate supporting system are welded. Full-position welding can be carried out, the welding speed is high, and the deposition efficiency ishigh.

Description

technical field [0001] The invention relates to a pool assembly and welding structure, in particular to a stainless steel pool assembly and welding structure for MIG semi-automatic welding nuclear power plants, belonging to the technical field of nuclear power plant construction. Background technique [0002] According to the structure and application of stainless steel cladding, the stainless steel cladding of nuclear power plants is divided into two categories: one is the stainless steel cladding of pools that cannot be emptied during the operation of nuclear power plants, such as stainless steel cladding of IRWST pools, stainless steel cladding of ASG pools, steel cladding of EHR pools, spent fuel pools Stainless steel cladding, etc.; the thickness of the bottom cladding plate of this type of pool is 6mm, the thickness of the pool wall cladding plate is 4mm, and the thickness of the pool top cladding plate is 4mm. The welding seam inspection of the cladding plate is inspec...

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Problems solved by technology

[0005] 1. The arc voltage, welding speed, wire feeding speed and other important welding parameters fluctuate greatly, which increases the probability of welding defects such as incomplete fusion, pores, and tungsten inclusions. The surface of the weld is not beautiful enough, and the internal quality of the weld is stable. poor consistency

[0006] 2. Welding working conditions are poor and the strength is high, it is difficult to ensure the continuous welding process, the welding efficiency is greatly reduced and the welding quality is unstable, the first pass rate of the weld is low, and the welding period cannot be guaranteed

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