Pipeline welding process for sloping field

Abstract

The invention discloses a pipeline welding process for a sloping field. Groove preparation is conducted on pipe openings of two pipelines, asymmetric double-V-shaped combined grooves are formed, and then locating, pairing, preheating, root welding, hot welding, filling welding, cosmetic welding are carried out in sequence, operation is easy, stability is high, labor cost is reduced, and meanwhile reliable weld quality can be guaranteed. Furthermore, the double-V-shaped combined grooves are adopted in the process, the size of the grooves is small, required filling welding material is less, and welding cost can be lowered as well.

Description

technical field [0001] The present application relates to the technical field of pipeline construction, in particular to a welding process for pipelines on slopes. Background technique [0002] In recent years, with the increase of energy demand, the pace of construction of oil and gas pipelines in the world has become increasingly rapid. Nowadays, the vigorous development of oil and gas pipeline construction has put forward new requirements for pipeline steel grade, pipe diameter and high-efficiency pipeline construction. After several years of engineering practice, it has been proved that the welding efficiency and welding pass rate of manual welding and semi-automatic welding are far lower Therefore, it is imperative to vigorously promote and expand the application space of automatic welding. In mountainous and hilly areas, due to harsh terrain conditions, large longitudinal slopes, and narrow construction areas, it has become a difficult point in the pipeline constructi...

AI Technical Summary

Problems solved by technology

Due to the large longitudinal slope of the pipeline, the welding difficulty is relatively high. During the welding process, the molten pool tends to be biased to one side of the groove due to the influence of gravity. A slight improper transport of the welder will easily lead to undercuts on the upper side of the weld, and slag inclusions on the lower side. Defects such as lack of fusion; therefore, the quality of the weld is not easy to control and is greatly affected by the level of the welder

At present, there is no report on the research on automatic welding technology in large slope areas. In order to improve the overall operation efficiency, reduce labor costs and labor intensity, it is imperative to carry out research on automatic welding equipment and welding technology in mountainous areas.

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