Welding device for welding nickel washer

Abstract

The invention belongs to the field of pressure vessel maintenance engineering, and particularly discloses a welding device for welding a nickel washer, which comprises a base, a channel, sliding grooves, sliding blocks and fixing devices, wherein the channel is arranged in the base and penetrates through the top surface and the side surface of the base to form a first opening and a second opening; the sliding grooves are symmetrically arranged at the two sides of the first opening on the top face of the base; the sliding blocks are matched with the sliding grooves and slidably connected to the sliding grooves respectively; the fixing devices are arranged on the top faces of the sliding blocks and detachably connected with the sliding blocks; and the second opening is communicated with an inert gas source, and inert gas flows out of the first opening through the channel. The device is simple in structure and convenient to operate, welding seam oxidation is effectively avoided by providing continuous and stable inert gas in a welding area, the inert gas is provided continuously after welding is completed until a welding seam is completely cooled, the phenomenon of overheating of the welding seam is effectively reduced, meanwhile, free contraction of the welding seam is achieved through the arrangement of the sliding blocks, and the welding quality is effectively improved.

Description

technical field [0001] The invention belongs to the field of maintenance engineering of pressure vessels, and in particular relates to a welding device for welding nickel gaskets. Background technique [0002] The nickel gasket on the main sealing surface of the reactor pressure vessel of a nuclear power plant is made of nickel wire bent into a circle and welded at the interface. The component sealing surface is pressed tightly to seal the upper component and the pressure vessel. The welding quality of the nickel gasket plays an important role in ensuring the tightness of the reactor pressure vessel. [0003] Due to the active chemical properties of nickel, it is easy to oxidize during the welding process, resulting in thermal cracks and pores. Therefore, the protection of the welding area during the welding process and after welding is an important factor in determining the quality of the weld. [0004] However, in the existing welding method, the nickel wire is easily ox...

AI Technical Summary

Problems solved by technology

The existing welding method adopts the method of reducing the pressing force when the base metal on both sides of the weld is positioned, which cannot achieve the requirement of complete free shrinkage of the nickel gasket weld

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