Welding method of oil gas transmission antisulphour steel pipelines

Abstract

The invention discloses a welding method of oil gas transmission antisulphour steel pipelines, which comprises the steps of: 1, treating welding joints of the antisulphour steel pipelines, 2, conducting positioned welding on the welding joints of the adjacent antisulphour steel pipelines, 3, controlling preheating temperature and interlayer temperature of the welding joints, 4, conducting argon tungsten-arc root welding on the welding joints of the adjacent pipelines, 5, conducting manual arc hot welding, filling welding and cosmetic welding on the welding joints of the adjacent pipelines with low-hydrogen electrodes, and 6, conducting post-welding hydrogen removal heat treatment on the welding joints. According to the welding method, since the argon tungsten-arc root welding is combined with the manual arc hot welding, filling welding and cosmetic welding with the low hydrogen electrode, the welding joints with good corrosion resistance and crack resistance can be obtained by effectively controlling the welding parameters, preheating temperature and post-welding heat treatment temperature; the oil gas pipelines can operate stably and safely in service under a sulphated working condition; and the welding method has an active significance in the development of a sulphated oil and gas field.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method for welding steel pipes of anti-sulfur pipelines for oil and gas transportation. Background technique [0002] Pipeline transportation is widely used in the transportation of oil and gas due to its safety, economy, expertise and efficiency. Commonly used oil and gas transportation pipelines generally use API Spec5L PSL2 grade pipeline steel (such as B grade steel, X42~X80). However, with the rapid development of the world economy, the dependence on oil and natural gas is increasing, and oil and gas fields with high sulfur content in complex environments are gradually being developed. The phenomenon of corrosion cracking has become one of the hotspots in the field of corrosion research in the world. In order to reduce the major economic losses and safety problems caused by corrosion and cracking, PSL2 sulfur-resistant pipeline steel has been widely promote...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a welding method for oil and gas transmission anti-sulfur pipeline steel pipes, which solves the technical problem of poor welding quality in the welding process of sulfur-resistant pipeline steel pipes in the prior art, and provides a welding method with better welding quality and corrosion resistance. Better welding methods and welding parameters with better crack resistance performance

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