Manufacturing method for steel inter-anticorrosion-mouth-repair-free elbow

Abstract

The invention relates to a manufacturing method for a steel inter-anticorrosion-mouth-repair-free elbow. The manufacturing method comprises the following steps that the elbow is prepared; four short pipes with the same length are cut, and two of the short pipes are used as the short pipes for field connection; a stainless steel welding wire is used as a surfacing material, a stainless steel layer is arranged on the inner wall of one end of each short pipe in a surfacing manner, and anticorrosion alloy pre-mouth-repair layers are formed; and grooves and surfacing transition regions are machined; the non-surfacing ends of the two connecting short pipes are welded to the two ends of the elbow, and the straight pipe ends are formed; and during the field elbow connection, the other two short pipes are correspondingly welded to the straight pipe ends of the two ends of the elbow, anticorrosion coating is conducted on the inner walls of welding seams, and continuous anticorrosion layers are formed. The manufacturing method has the beneficial effects that the bottleneck problem of the steel pipeline elbow welding seam inner anticorrosion technology is solved, the internal anticorrosion factorization of the elbow welding seams is achieved, and the pipeline construction efficiency is improved; the pipeline corrosion prevention and construction cost is lowered, and the service life of the pipeline is prolonged; and the environment protection and safety risks caused by the corrosion leakage of the pipeline elbow welding seams are lowered.

Description

technical field [0001] The invention relates to the field of pipelines, in particular to a method for manufacturing a steel elbow without internal anti-corrosion repair, which solves the problem of anti-corrosion repair in the weld joint of the steel pipe elbow. Background technique [0002] In pipeline welding anti-corrosion construction, it is necessary to carry out anti-corrosion treatment on the inner wall of the welding joint after each section of the pipeline is welded. This process is called "internal repair". Therefore, the internal anti-corrosion repairing of the elbow welding joint has always been the technical bottleneck of the pipeline industry, which affects the overall life of the steel pipeline, especially the economic benefits of oil field gathering stations and petrochemical refineries where there are a large number of elbows. cause serious safety and environmental risks. Contents of the invention [0003] The purpose of the present invention is to aim at...

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Problems solved by technology

[0002] In pipeline welding anti-corrosion construction, it is necessary to carry out anti-corrosion treatment on the inner wall of the welding joint after each section of the pipeline is welded. This process is called "internal repair". Therefore, the internal anti-corrosion repairing of the elbow welding joint has always been the technical bottleneck of the pipeline industry, which affects the overall life of the steel pipeline, especially the economic benefits of oil field gathering stations and petrochemical refineries where there are a large number of elbows. Serious safety and environmental risks

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