Welding groove process of mechanical bimetallic composite marine pipe

Abstract

The invention discloses a welding groove process of a mechanical bimetallic composite marine pipe. Groove manufacturing steps are as follows: (1), preparation: 1, preprocessing a pipe end so that the mechanical composite marine pipe forms a local metallurgical composite marine pipe in a pipe end area; and 2, processing a reference surface, and clearing a groove and two sides of the outer wall of the groove so as to obtain a level end surface till metallic luster appears; (2), manufacturing of the groove: 1, manufacturing a single-sided groove by one time, wherein a groove angle is 8 degrees plus or minus 1 degree, a blunt edge is 1.8mm plus or minus 0.2mm, a transitional arc for connecting the groove and the blunt edge is a combined groove with the radian R of 3mm, a butting gap between grooves is 0mm, and a corrosion-resistant alloy material layer at the root of the groove is provided with a platform with the width of 1mm; and 2, checking and verifying that a welded part and the edge thereof are free of defects; and (3) performing butt welding on the grooves. By the welding groove process of the mechanical bimetallic composite marine pipe, the area of the welding groove is reduced, the welding material is saved, the labor intensity of working staff and the difficulty of butting construction are reduced, the welding time is shortened, the marine construction cost is reduced, and a technical support is provided for later construction of the mechanical bimetallic composite marine pipe.

Description

technical field [0001] The invention relates to a sea pipe welding process, in particular to a mechanical bimetal composite sea pipe welding groove process. It belongs to the field of marine engineering. Background technique [0002] Mechanical bimetallic composite sea pipe is composed of outer carbon steel material and inner anti-corrosion alloy steel material in a mechanical way. It is a new type of marine oil and gas transportation material that combines the high strength of outer carbon steel and the anti-corrosion advantages of inner alloy steel. , it fundamentally changes the singleness and limitations of traditional metal pipes, and is suitable for transporting acidic media under high temperature and high pressure environments. [0003] The welding quality requirements of mechanical bimetal composite sea pipes are relatively high, and argon arc welding is usually used. Since the single-side groove angle of the traditional mechanical bimetal composite sea pipe argon ...

AI Technical Summary

Problems solved by technology

[0004] As the development of offshore oil continues to move towards the deep water field, the length of offshore oil and gas pipelines is getting longer and longer. Due to the high time and cost of laying offshore oil and gas pipelines, traditional welding grooves are no longer suitable for long-distance offshore pipelines. Laying application cannot meet the requirements of efficient production development