Shielding gas plugging tooling for butt welding of steel pipes

Abstract

The invention discloses a shielding gas plugging tooling for butt welding of steel pipes. The shielding gas plugging tooling comprises a first plugging assembly and a second plugging assembly, whereinthe first plugging assembly comprises a first rigid support plate and a first rubber sealing part, and the excircle of the first rubber sealing part is in sealing cooperation with the inner diameterof each steel pipe; the second plugging assembly comprises a second rigid support plate and a second rubber sealing part, and the excircle of the second rubber sealing part is in sealing cooperation with the inner diameter of each steel pipe; an air exhaust opening is formed in one of the plugging assemblies of the first plugging assembly and the second plugging assembly, and an argon diffusion pipe and an argon inlet pipeline communicating with the argon diffusion pipe are arranged on the other plugging assembly; and the first plugging assembly and the second plugging assembly are respectively placed in inner holes in two sides of butting seams of the steel pipes, the steel pipes are horizontally arranged, the air exhaust opening is located to the upper side part of the inner diameter ofeach steel pipe, and the argon diffusion pipe is located at the lower side part of the inner diameter of each steel pipe. The butt welding quality of the steel pipes is improved.

Description

technical field [0001] The invention relates to the technical field of welding process equipment, in particular to a shielding gas sealing tool for butt welding of steel pipes. Background technique [0002] When welding easy-to-oxidize metal and special steel pipes, it is necessary to fill the pipes with inert gas protection to prevent the welds in the pipes from being oxidized. Especially in the construction of oil tankers / chemical tankers, a large number of butt girth welds of stainless steel pipes need to be welded by argon arc welding. In order to prevent the formed weld seam in the pipe from being oxidized, both ends of the pipe need to be sealed and filled with argon gas for protection. In particular, stainless steel liquid cargo pipes for chemical tankers have strict requirements on the color of the weld seam formed in the pipe, and the oxygen content of the weld seam must be Less than 50ppm. [0003] Generally, the easiest way to inflate protection in stainless ste...

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Problems solved by technology

[0003] Generally, the easiest way to inflate protection in stainless steel pipes is to cut the corresponding specification sponge according to the diameter of the pipe and insert the inflatable pipe into the pipe near both sides of the weld for sealing and inflatable protection. Since the sponge is hollow, argon gas enters the pipe for replacement. When the air is used, part of it will be directly discharged out of the tube, which cannot effectively discharge the air as a whole, resulting in too long replacement time and increased argon consumption

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