Device and method for preventing welding deformation of pipelines in nuclear power plant

Abstract

The invention provides a device and method for preventing welding deformation of pipelines in a nuclear power plant. The device comprises a supporting frame, a fixed platform fixed on the supporting frame, a jacking mechanism movably connected with the fixed platform, and a clamp detachably connected with the fixed platform. Before welding, a pipeline with a connecting pipe seat hole is fixed on the fixed platform, then external force which is equal to welding stress in intensity and opposite to the welding stress in direction is exerted on the pipeline through the jacking mechanism, so that the pipeline is made to generate pre-deformation which is the same as welding deformation in amplitude and opposite to the welding deformation in direction, and welding deformation can be eliminated after a pipe connecting seat is welded on the pipeline. Accordingly, deformation correction does not need to be conducted after welding, the work period is saved, the construction efficiency is improved, meanwhile, the construction cost is lowered, the requirements for the construction quality, the schedule and the cost of the nuclear power plant are met, and therefore the technical problems that in the prior art, the method for conducting manual correction on the pipelines which are subjected to welding deformation is low in efficiency, high in maintaining cost, and poor in engineering quality are solved.

Description

technical field [0001] The invention relates to the technical field of construction of nuclear power plants, in particular to a device and method for preventing deformation of pipelines of nuclear power plants during welding. Background technique [0002] In the process of pipeline construction in nuclear power plants, the pipelines of temperature, pressure (pressure difference), flow and other measuring points are generally connected to the pipeline through the connection socket. The socket is welded to the pipe with the welding hole opened. Since the socket is generally asymmetrical in shape, the welding of the socket is generally one-sided asymmetrical welding. Since it is generally not possible to preheat the pipe temperature to the welding temperature during welding, there will be a temperature difference between the pipe preheating temperature and the pipe welding temperature, and the cooling shrinkage of the pipe and the weld seam will be inconsistent, so that the we...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the pipes of nuclear power plants in the prior art are prone to welding deformation when welding the sockets, the method of manually or mechanically correcting the deformation of the pipes has low efficiency, high maintenance costs, and poor engineering quality, which cannot meet the requirements for the construction quality, schedule and cost of nuclear power plants. The technical problem required, the present invention provides a new device and method for preventing nuclear power plant pipeline welding deformation

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