Anticorrosion surfacing method for inner wall of steel pipe welding seam

Abstract

The invention discloses an anticorrosion surfacing method for the inner wall of a steel pipe welding seam. The method is different from the general steel wear-resistant surfacing and the size recovery surfacing and is the anticorrosion surfacing method for the inner wall of the pipe end of a steel pipe on the premise of guaranteeing the good welding performance and the anticorrosion performance of the pipe welding seam. The method is the technology for guaranteeing the continuity of an anticorrosion layer of the inner wall of the steel pipe and belongs to the main part of the inner surfacing anticorrosion technology of the steel pipe welding seam. According to the method, through floating turning of the inner wall of the pipe end, the cleanness of the surface of a pre-surfacing base metal is improved, and the quality of a surfacing layer is guaranteed; and through interface vacant-combustion solid solution, smooth transition of an anticorrosion coating and the anticorrosion surfacing layer of the inner wall of the steel pipe is guaranteed. By the adoption of the method, the anticorrosion performance of the anticorrosion surfacing layer and the continuity of the anticorrosion layer of the inner wall of the whole steel pipe can be guaranteed, it also can be guaranteed that the cut-off, caused by input of energy of surfacing lines, of the pipe end of the steel pipe does not exceed the range specified in the pipeline steel pipe standard, and the practicability of the inner surfacing anticorrosion technology for the steel pipe welding seam is guaranteed. The effect of the anticorrosion surfacing for the inner wall of the steel pipe welding seam is shown in a figure in the abstract.

Description

technical field [0001] The invention relates to the technical field of steel pipe inner wall anticorrosion. The method is different from general steel wear-resistant surfacing welding and size recovery surfacing welding. A surfacing welding method, which is a technology for ensuring the continuity of the anticorrosion layer on the inner wall of a steel pipeline, and belongs to one of the main parts of the surfacing welding anticorrosion technology in the welding joint of a steel pipeline. method. Background technique [0002] In the welding construction of steel pipelines, due to the influence of welding heat input, the internal anti-corrosion coating in the weld area of ​​the pipeline is destroyed, and the microstructure of the weld metal is changed, resulting in a decrease in the corrosion resistance of the pipeline welds and a Corrosion of the inner wall area before the pipeline results in the leakage of the transport medium, which reduces the online service life of the ...

AI Technical Summary

Problems solved by technology

[0005] Generally, the thermal expansion coefficient of corrosion-resistant alloys is much larger than that of the base metal, and the pipe wall of the steel pipe for fluid transportation is generally thin. Overlay welding anti-corrosion technology in the weld has lost its practicability

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