Automatic welding device and welding method for local repair of nuclear reactor pressure vessel sealing structure

By designing an automatic welding device for sealing structure of nuclear reactor pressure vessels, the problem of welding repair in confined space and irradiated environments is solved, high-precision and automated welding repair are achieved, and the stability and reliability of repairs are improved.

CN119703284APending Publication Date: 2025-03-28CNNC NUCLEAR POWER OPERATION MANAGEMENT CO LTD +1
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Patent Information

Application Number
CN202411900054.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The prior art is difficult to realize local, remote, automatic precision welding repair of the roof sealing ring groove and the cylinder flange sealing surface under the confined space and irradiation environment of the sealing structure of the nuclear reactor pressure vessel.

Method used

An automatic welding device is designed, including a clamping mechanism, a curved walking mechanism and a welding head assembly. The arc-shaped walking mechanism is driven by a servo motor and a precision reducer. The welding head assembly integrates the welding gun angle mechanism, an arc pressure tracking mechanism and a wire feeding adjustment mechanism, which can achieve high-precision welding in a confined space.

Benefits of technology

It realizes the welding repair in a automated and precise manner in the narrow space of the sealed structure of the nuclear reactor pressure vessel, which improves the stability and reliability of the repair, and meets the welding needs of multiple types of pressurized water reactor units.

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Abstract

The invention relates to the field of welding, in particular to an automatic welding device and method for local repair of a nuclear reactor pressure vessel sealing structure. The device comprises a clamping mechanism, wherein an arc-shaped walking mechanism is fixedly connected to the surface of the clamping mechanism; arc belt teeth are mounted on the arc-shaped base, and a servo motor and a precision speed reducer which are mounted on the sliding trolley drive a gear to move on the arc-shaped belt teeth in a meshing manner; the welding machine head assembly is installed on a sliding trolley of the arc-shaped walking mechanism. The wire feeding mechanism and the yawing mechanism are arranged on two sides of the sliding trolley, the side surface of the yawing mechanism is connected with the arc pressure tracking mechanism, and the lower end of the arc pressure tracking mechanism is connected with the welding gun tilt angle mechanism; the welding gun is fixed to the welding gun swing angle mechanism through a clamping block, and the welding gun swing angle mechanism drives the welding gun to change the angle in the vertical plane. A camera and a wire feeding adjusting mechanism are mounted at the head of the welding gun; a welding gun can penetrate into a top cover sealing ring groove with the minimum width being 16.5 mm and the maximum depth being 40 mm, and wire feeding precision automatic wire filling welding within the maximum length range being 500 mm is achieved. The technical problem of local, remote and automatic precision welding repair of a top cover sealing ring groove and a barrel flange sealing face under the condition that a multi-type pressurized water reactor unit reactor pressure vessel sealing structure is limited in space and in the irradiation environment is solved.
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