| 摘要 |
A pipe joint structure is provided to weld without rear-sealing, and to prevent an oxide scale from being generated at an inner surface of a pipe. A pipe(1) includes a first pipe(11), a second pipe(12), and a third pipe(13). A pipe joint structure(10) are installed between the first pipe and the third pipe. The first pipe has an approximately uniform thickness, and is a stainless pipe having grooves(B) at both ends. The second pipe has a groove at an end facing the first pipe, and a convex unit(14) of the pipe joint structure at an opposite end. The third pipe has a concave unit(15) of the pipe joint structure at an end facing the second pipe, and a groove at an opposite end.
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