Abstract: A pipe connection joint comprising a linear slant portion formed on a pipe joining hole of a flange and a pipe-expanded portion expandably formed on a pipe. The pipe-expanded portion is joined to the pipe joining hole, along the linear slant portion. A pipe connection joint with an inwardly-curved surface portion of the pipe bent by micro R bending technology is also disclosed.

Abstract: The present invention relates to a pipe connection joint that includes a linear slant portion formed on a pipe joining hole of a flange and a pipe-expanded portion expandably formed on a pipe, which is joined to the pipe joining hole, along the linear slant portion, whereby it provides a sufficient joining strength due to an increase of a contact area between the flange and the pipe, secures a firm fixation, prevents rotation of the pipe and guarantees communalization. In addition, the pipe connection joint is provided with an inwardly-curved surface portion of the pipe bent by micro R bending technology to minimize a bending distance, whereby it allows an easy product design in a restricted space. The pipe connection joint is further provided with a sealing member seating portion formed by the pipe-expanded portion of the pipe without needing additional process for seating of a sealing member to thereby minimize machining and reduce manufacturing expenses.