Welding device for nuclear-grade gate valve element seal face repairing

Abstract

The invention belongs to the technical field of nuclear power plant overhauling, and particularly relates to a welding device for nuclear-grade gate valve element seal face repairing, and aims at achieving the purpose that for limitation of existing technologies and equipment, welding equipment applied to online repairing of a radioactive stained nuclear-grade gate valve plate in a nuclear power plant radioactive workshop is invented to repair the nuclear-grade gate plate in which cracks, large pits or corrosion or the like exist in the seal face, the vacancy in the domestic online nuclear-grade gate valve plate repairing is filled up, and meanwhile the construction environment is improved, wherein the above defects cannot be repaired only through turning and grinding. The welding device is characterized by comprising a base structure, a shell structure, a welding machine and a waste gas adsorption structure; and since a surfacing device can be applied into the nuclear power plant workshop, the polluted valve plate can be repaired online without being taken out of the workshop, and the problem that radioactive stained equipment cannot be taken out of the workshop for offline overhauling is effectively solved.

Description

Technical field [0001] The invention belongs to the technical field of nuclear power station maintenance, and in particular relates to a welding device for repairing the sealing surface of a nuclear-grade gate valve valve core. Background technique [0002] At present, the repair of the sealing surface of the non-nuclear gate valve valve plate of conventional thermal power plants or chemical plants usually adopts offline processing. For shallow dents and scratches on the sealing surface of the valve plate, it can be directly processed by grinding or turning and grinding. In the case of deep pits or scratches, the sealing surface is usually turned clean to expose the base of the valve plate, then hard alloy is surfacing, and the sealing surface is turned and ground to make the angle between the valve plate angle and the valve seat sealing surface Match. The welding method usually adopts manual surfacing or automatic oxyacetylene flame welding. [0003] Judging from the current si...

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Problems solved by technology

Traditional automatic welding equipment is not highly integrated, occupies a large space, and dust splashes during welding operations, which is difficult to meet the requirements for welding operations inside the nuclear power plant building

[0005] In addition, the size of the nuclear-grade gate valve plate is large, the workload of manual surfacing welding is large, and the labor intensity is high, and the nuclear-grade gate valve valve plate has high requirements for surfacing welding on the sealing surface. Due to individual differences, the quality of surfacing welding varies among different welders. , the repeatability is poor, so it is not advisable to adopt manual surfacing welding for the gate plate of large-scale nuclear-grade gate valve

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