Thick-wall pipeline bevel fit-up method

Abstract

The invention particularly relates to a thick-wall pipeline bevel fit-up method. The thick-wall pipeline bevel fit-up method is characterized by comprising the steps that pipelines are placed on a work table; the pipelines are fixed by using positioning brackets respectively; a gap adjusting ruler is inserted into a gap between the two pipelines, the two pipelines are adjusted so as to make the gap adjusting ruler attached to the two pipelines at the same time; gap positioning blocks are inserted into the gap between the two pipelines; the gap positioning blocks are subjected to spot welding respectively, after spot welding is finished, the fit-up pipeline is moved to the other side of the work table for complete welding; the gap positioning blocks are removed, so that the pipeline is subjected to welding, and after back welding or sequence back welding is finished, the gap positioning blocks obtained after spot welding are ground and removed by using a grinding machine. In the fit-upmethod, the gap between the pipelines is precisely controlled by using the gap positioning blocks, and meanwhile, the gap positioning blocks can be removed, so that no damage to the pipeline is caused. Therefore, compared with a traditional pipeline fit-up method, the thick-wall pipeline bevel fit-up method has the advantages of being high in fit-up speed and good in fit-up effect.

Description

technical field [0001] The invention relates to the field of pipeline engineering, in particular to a method for combining grooves of thick-walled pipelines. Background technique [0002] Pipeline alignment is an important step in pipeline welding control, and the control of groove gap is a difficult point in pipe assembly. Especially for pressure pipelines, the adjustment of groove gap directly affects the welding quality of pipelines. Generally, pipeline Welding adopts single-sided welding and double-sided forming, so argon tungsten arc welding is generally used in pipeline welding. This welding method is most conducive to ensuring the internal quality of pipeline welding. However, in the welding of thick-walled pipes, due to the high penetration of welding, welding deformation often occurs with the input of heat during the welding process, which seriously affects the welding quality of pipes, so the gap of the groove must be strictly controlled. Generally, there are two ...

AI Technical Summary

Problems solved by technology

However, in the welding of thick-walled pipes, due to the high penetration of the weld, welding deformation often occurs with the input of heat during the welding process, which seriously affects the welding quality of the pipe, so the gap between the grooves must be strictly controlled

Generally, there are two ways to adjust the groove gap, one is to fix it by spot welding ribs, but it will damage the base metal; the other is to directly spot weld after assembly, but it is not conducive to controlling the size of the gap, which will affect the welding quality

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