Pipeline cellulose vertical down welding method

Abstract

The invention discloses a pipeline cellulose vertical down welding method. The method includes the following steps: S1, making preparation before welding; S2, performing pipeline weld bond fitting-upand positioning; S3, sequentially performing backing welding, hot welding, filling welding and cosmetic welding on grooves by using a DC arc welding machine in cooperation with a cellulose electrode;S4, performing weld seam quality inspection, evaluating the result according to an inspection standard, if the result meets the inspection standard, performing post-welding heat treatment, otherwise,performing repairing or reworking; and S5, performing a hardness test on the weld seam after heat treatment, if the result meets a hardness requirement, performing a bulge test, otherwise, performingreworking to continue heat treatment.

Description

technical field [0001] The invention relates to a pipeline welding method, in particular to a pipeline cellulose vertical downward welding welding method, which is suitable for urban central heating pipeline welding construction. Background technique [0002] Urban central heating system is an important infrastructure for urban economic and social development, and its development level is a symbol of urban modernization. With the development of urban central heating, the welding technology in pipeline construction (including welding equipment, welding process, welding quality, etc.) ) puts forward higher requirements, especially for urban heating pipelines with long lines, large pipe diameters and high pressures, higher requirements for pipeline welding processes, and stricter quality control. [0003] Pipeline welding is a systematic project consisting of many links. At present, many cities are promoting central heating, so large-scale heating pipe network construction is f...

AI Technical Summary

Problems solved by technology

After the existing ordinary welding rod welding construction is completed, the flaw detection test detects that the pipeline has welding quality problems such as slag inclusions, pores, and weld width inconsistencies. It is difficult to repair, and it is difficult to achieve the desired effect. Welding requirements; moreover, in the construction process of ordinary electrode welding, a construction process standard configuration of at least 10 people is required, the construction site environment is relatively complex, and there are many uncertain factors, which is not conducive to the complex process of nozzle assembly. In addition, the construction cost is high

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