Welding method of metal pipe fitting

Abstract

The invention discloses a welding method of a metal pipe fitting. The welding method of the metal pipe fitting includes the following steps: firstly, a welded pipe fitting is sleeved on a base pipe and an entrance end of the base pipe stretches out of the sleeved pipe fitting; secondly, a stretched part of the base pipe is inserted into a pipe fitting to be welded so that welding ends of the welded pipe fitting and the pipe fitting to be welded are connected in an abutted mode and a joint to be welded is formed; thirdly, welding is performed on the joint to be welded so that the welding ends of the welded pipe fitting and the pipe fitting to be welded are connected; fourthly, the base pipe is pulled out of the pipe fittings which are connected in a welded mode. The welding method of the metal pipe fitting improves a joint welding manner, the base pipe can position the welded pipe fitting and the pipe fitting to be welded and the base pipe covers the inner side portion of the joint to be welded so that the inner wall of the welding joint of the welded pipe fitting and the pipe fitting to be welded is isolated from air in the pipes. Thus, linearity in welding the pipe fittings is improved, a bump is effectively prevented from forming at the inner wall of the welding joint and as the base pipe is placed inside, the wall of the welding joint is not prone to burn through.

Description

technical field [0001] The invention belongs to the technical field of metal pipe welding connection, and in particular relates to a welding method for metal pipe fittings. Background technique [0002] Metal pipes are widely used in all aspects of production and life, and are used to transport various media such as liquids, gases, and solids. At the end of metal pipe fittings, especially thin-walled metal pipe fittings, deformations such as cracks and perforations are prone to occur under the influence of external environments such as corrosion, vibration, and erosion. The safest, most reliable and most economical way to repair the deformed part is to remove it and weld the same size pipe fittings in the original place. For the butt welding of pipe fittings with the same pipe diameter, it is easy to have defects such as misalignment, unevenness, and fusion, especially for the welding of thin-walled stainless steel pipes. [0003] For the welding of thin-walled stainless s...

AI Technical Summary

Problems solved by technology

For the butt welding of pipe fittings with the same pipe diameter, it is easy to have defects such as misalignment, unevenness, and fusion, especially for the welding of thin-walled stainless steel pipes.

[0003] For the welding of thin-walled stainless steel pipes, some technologies use a sleeve to line the weld. Although the strength of the weld is increased, the wall thickness of the liner is additionally increased, so that the inner diameter of the welded pipe is reduced.

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