| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a joining structure of a tube material capable of joining the tube material by heating and welding without generating a void in a weld part or the swelling or recess of beads on the inside of the weld part. <P>SOLUTION: In the joining structure of the tube material 2 by inserting a tube end 20 to a thermoplastic resin joint 1 having an end surface composed of a plurality of faces 11, 12 and 13 on the inside of a tube end 10 and mutually joining the tube ends 10 and 20 by heating and welding, the end surface of the thermoplastic resin tube material 2 includes a plurality of cut faces 22 and 23 which form clearances 30a and 30b extending toward inner wall surfaces 10b and 20b with a plurality of faces 12 and 13 when the tube is inserted to the joint 1, and the plurality of cut faces 22 and 23 and the end surface of the joint 1 extend the respective contact faces by expansion during heating while removing the clearances 30a and 30b so as to push out and release air. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
