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.