Connecting structure for reactor vessel and welding process

Abstract

The invention discloses a connecting structure for a reactor vessel. The connecting structure comprises an internal connecting pipe and an outlet connecting pipe. The internal connecting pipe is positioned in the reactor vessel, and an annular first groove is formed in the inner side wall of the internal connecting pipe. An annular second groove is formed in the inner side wall of the outlet connecting pipe. One end of the outlet connecting pipe is welded to the internal connecting pipe, and the other end of the outlet connecting pipe penetrates through the reactor vessel and extends out of the reactor vessel. After the outlet connecting pipe is welded to the internal connecting pipe, the first groove and the second groove form a third groove. The invention provides the connecting structure for the reactor vessel and a welding process used for the connecting structure for the reactor vessel and suitable for pipe-pipe inner wall butt joint 360-degree all-position automatic argon arc welding, single-side welding and double-side forming. A tungsten electrode can be accurately aligned to a weld joint in combination with an automatic searching function of a welding machine tungsten electrode touching the side wall of a groove. The groove with wide process parameters and the specific welding process are adopted to obtain good weld joint quality, welding defects caused by human factors are reduced, and productivity is improved.

Description

technical field [0001] The invention relates to the field of nuclear power, in particular to a connection structure and welding process for reactor vessels. Background technique [0002] The thorium-based molten salt reactor is the main type of molten salt reactor among the six reactor types of the International Forum of Generation IV Nuclear Energy Systems, and is considered to be one of the safest reactor technologies in the future. The energy generated by the fission of 1 kg of thorium is equivalent to the heat generated by the combustion of 3,500 tons of standard coal. It can be seen that the combustion efficiency of thorium is very high. The on-site installation of the inlet and outlet pipes of a new thorium-based molten salt reactor vessel and the internal pipes of the heat exchanger adopts all-position butt joint TIG internal welding (non-melting electrode gas shielded arc welding), the weld depth is 411mm, and the position of the butt weld seam is as follows: figure...

AI Technical Summary

Problems solved by technology

Due to the limited external space of the product structure, it is impossible to weld the pipe outside; due to the small inner diameter of the pipe, a high-temperature resistant molten pool observation system cannot be installed inside, and only the inner hole can be blindly welded. During the welding process, the molten pool cannot be observed and cannot be adjusted in real time. The welding parameters greatly increase the difficulty of the process. In order to solve the problems of the above-mentioned existing technologies, a groove and welding process with a wide process parameter window is designed to deal with the wrong edge and gap of the team.

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