Method of assembling main pipe and branch pipe of welded pipeline and tooling used for assembling and welding

Abstract

The invention provides a method of assembling a main pipe and a branch pipe of a welded pipeline and a tooling used for assembling and welding and relates to the field of prefabricating pipeline in the process of building a nuclear power station. The problems that welding effects are bad, workload is big and correction effects are bad when the prior art is used to weld a connecting part between the main pipe and the branch pipe of the welded pipeline are solved. According to the method of assembling the main pipe and the branch pipe of the welded pipeline, a main pipe support of the pipeline is arranged and fixed on supporting stands, wherein the main pipe support is formed by connection of tack welding, the branch pipe is arranged above the main branch and is the same vertical plane with the main pipe, the pipeline is provided with the tooling used for assembling and welding, two flat steel rings of the tooling are sleeved on the main pipe, a supporting plate is arranged in the flat steel rings in a penetrating mode to place a jack, the jack is arranged under a connecting part between the main pipe and the branch pipe, and a guard board is arranged on the jack. Deformation quantity of the pipeline is reduced by adjusting height of the jack after welding. The tooling is disassembled when a welded part is cooled. The assembling and welding method is strong in adaptability, small in workload, low in working intensity, short in time consuming, even in weld joints and good in correction effects.

Description

technical field [0001] The invention relates to the field of prefabricated pipelines during the construction of nuclear power plants, in particular to a method for butt welding of main pipes and branch pipes in a pipeline, and a tool used for butt welding of main pipes and branch pipes. Background technique [0002] At present, when the main pipe and the branch pipe of the pipeline are welded together by the group butt welding method, a flat welding construction site is usually selected first, so that the main pipe and the branch pipe can be placed on the flat welding construction site for welding. Before welding, weld the main pipe and the branch pipe together by spot welding, and the main pipe and the branch pipe are in the same plane, and place the pipe connected together by spot welding on a flat site; then, in the main pipe Place a correction pipe of the same specification as the main pipe on the side facing away from the branch pipe, and fasten the correction pipe and ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of uneven weld seam, poor welding effect, heavy workload, cumbersome construction, poor correction effect and serious pipeline deformation when the existing pair welding method is used to weld the connecting part of the main pipe and the branch pipe of the pipeline, this paper The invention proposes a method for assembling the main pipe and the branch pipe of the butt welding pipeline, the butt welding method includes the following steps:

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