An Argon Purging Protection Device and Method for Welding Austenitic Stainless Steel Pipes

By using an argon-filled protection device that moves inside an austenitic stainless steel pipe and employing magnetic partitions to isolate sections of the pipe, the problem of argon-filled protection being unsuitable for longer pipes in existing technologies has been solved, resulting in a significant improvement in welding quality.

CN116551245BActive Publication Date: 2026-04-03PETROCHINA CO LTD
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Patent Information

Application Number
CN202210100133.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-01-27
Publication Date
2026-04-03
Estimated Expiration
2042-01-27

AI Technical Summary

Technical Problem

In the existing technology, the argon purging protection device inside the pipeline is not suitable for argon purging protection of long pipelines and cannot be delivered to the target location at a distance, resulting in poor welding quality.

Method used

An argon-filled protection device for welding austenitic stainless steel pipes was designed. It employs a first and a second partition section, which uses magnetic force to move and separate the pipes. The action of the second partition section is assisted manually from outside the pipe. It is suitable for segmented isolation argon-filled protection of long-distance pipelines.

Benefits of technology

It achieves effective argon purging protection for long-distance pipelines, reduces argon consumption, improves welding quality, and is suitable for pipelines made of S31254 super austenitic stainless steel.

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Abstract

This invention discloses an argon-filled protection device and method for welding austenitic stainless steel pipes. The device includes a first partition section, a second partition section, and a gas supply structure. The first and second partition sections are connected by a flexible connector. The first partition section divides the pipe and can drive the second partition section to move within the pipe. During the movement, the second partition section does not divide the pipe. The device moves to a target position within the pipe, and a magnetic component outside the pipe activates the second partition section to seal the pipe. After sealing the pipe, the pipe between the first and second partition sections becomes an isolation section. The leakage point is located on the isolation section, and the gas supply structure provides argon-filled replacement protection for the isolation section. This invention allows the device to move within the pipe and uses magnetic force to activate the second partition section to separate the pipe, without distance limitations. It is suitable for segmented isolation argon-filled protection and maintenance welding protection of long-distance pipelines.
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