High-efficiency welding process for outer pipe of double-layer subsea pipeline

Abstract

According to the high-efficiency welding process for the outer pipe of the double-layer subsea pipeline, gas shielded welding is adopted to replace gas-free self-shielded welding, equipment has the characteristics of application to laying requirement conditions of the subsea pipeline, easy arc striking, stable electric arc and large voltage and current adjusting range, the welding penetration depth and the welding seam are easy to control, and the welding quality is good; welding seams are good in crack resistance, forming is attractive, slag removal after welding is easy, current adjustment is convenient, and spot welding, continuous welding, self-locking welding and the like can be achieved. Compared with self-shielded welding, the gas shielded welding is small in splashing, small in smoke dust and small in harm to an operator.

Description

technical field [0001] The invention relates to the technical field of short-distance pipeline welding of sea pipelines, in particular to a high-efficiency welding process for outer pipes of double-layer submarine pipelines. Background technique [0002] In recent years, in the short-distance pipeline laying projects of submarine pipelines, the gas-free self-shielded welding process is usually used for welding, but the welding equipment uses Lincoln DC400 or DC600 welding power equipment, which is large in size and heavy in weight (215KG). Difficult; at the same time, it consumes high energy, takes a long time to purchase accessories, and costs high in maintenance. At the same time, it produces a large amount of smoke, which endangers the health of the operator. The operation process is downward welding, the penetration depth is shallow, and the slag removal is difficult. It must be polished with a grinder to clean it. In addition, the operator's line of sight is not good, ...

AI Technical Summary

Problems solved by technology

[0002] In recent years, in the short-distance pipeline laying projects of submarine pipelines, the gas-free self-shielded welding process is usually used for welding, but the welding equipment uses Lincoln DC400 or DC600 welding power equipment, which is large in size and heavy in weight (215KG). Difficult; at the same time, it consumes high energy, takes a long time to purchase accessories, and has high maintenance costs. At the same time, it produces a large amount of smoke, which endangers the health of the operator.