| 摘要 |
A pair of pipes are joined airtightly and securely through a pipe joint including a cylindrical main body and a pair of contact portions integrally protruded apart from each other in the longitudinal direction of the main body on the central inner wall of the main body individually capable of contacting end surfaces of the pipes, and a pair of retaining portions integrally protruded from inside ends of the contact portions along the longitudinal direction of the main body for clamping joining ends of the pipes in conjunction with the main body, by inserting the pair of pipes between the main body of the pipe joint and the pair of retaining portions from both ends of the main body, and upsetting the pipe joint and the pair of pipes until the pair of retaining portions closely contact each other while projecting the central portion of the main body along with joining ends of the pair of pipes in the radial direction so that the joining ends of the pipes clamped between the projected central portion of the main body and the pair of retaining portion are seamed.
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