PURPOSE: To reduce the stress concentrated at a connection part and to enhance sealability by providing a groove having a circular arc cross section to the welded connection end part of the pipe to be connected of a joint member and mounting an O-ring in the groove.
CONSTITUTION: A groove having a circular arc cross-section is formed to the inner surface 11a of a socket 11 so as to position at the insert welded end part of a pipe 1 to be connected not only to reduce stress concn. but also to become the mounting the holding part of an O-ring 13. The O-ring 13 is mounted to the groove 12 and the pipe 1 is inserted to weld the socket 11 to the pipe 1. Since no corner part is formed between the end part 1b of the pipe 1 and the inner surface 11a of the socket 11 and no slit part is also formed, the stress concn. at this part is reduced to a large extent. Further, since the O-ring 13 is mounted to the groove 12, the leakage of a fluid along a heating wire 3 is prevented and sealability can be enhanced.
ARIGA SHIRO
JPS5521232A | 1980-02-15 |