| 摘要 |
PCT No. PCT/GB97/00535 Sec. 371 Date Sep. 9, 1998 Sec. 102(e) Date Sep. 9, 1998 PCT Filed Feb. 26, 1997 PCT Pub. No. WO97/32686 PCT Pub. Date Sep. 12, 1997A method of welding two tubular members (1, 2) in end to end relationship includes providing the end of each tubular member (1, 2) to be joined with a shaped portion (3, 4). The shaped portion (3, 4) has a surface (10) which is substantially perpendicular to the radius of the tubular member (1, 2) and a second surface (13) at an obtuse angle to the radius of the tubular member (1, 2). Hence, when the ends to be joined are brought into contact with each other, shaped portions (3, 4) define a three-sided channel (13, 10, 13). A ring-shaped member (6) having a quadrilateral cross section is located in the channel. The ring-shaped member (6) has a radius which is greater than the radius of the first surface and less than the radius of the external wall of the tubular member (1, 2). The ring-shaped member (6) is rotated relative to the tubular members (1, 2) and the ring-shaped member (6) is subsequently compressed to bring the ring-shaped member (6) into contact with the shaped portions (3, 4) of the tubular members (1, 2) to form a friction weld which welds the tubular members (1, 2) together in end to end relationship. |
