| 摘要 |
1322815 Seaming NAPHTACHIMIE 4 June 1971 [5 June 1970] 19044/71 Heading B5K [Also in Division B3] In joining two elements 2, 3 of metal or thermoplastics material member, the elements are placed with their surfaces to be joined facing one another in parallel planes, an intermediate member is placed between the surfaces and is rotated or oscillated about an axis perpendicular to the surfaces while exerting a force on at least one of the elements to move the elements relatively together and bring the surfaces into contact with surfaces of the intermediate member and the position of the intermediate member is controlled by an apparatus responsive to differences in temperature and/or softening of material of the two pairs of contacting surfaces and including a double acting ram for adjusting the position of the intermediate member, the material of the contacting surfaces being joined in friction welds. Elements, e.g. pipes, of polyethylene or polyvinyl chloride may be joined. To join a further pipe 3 on to a pipe 2 forming part of a pipe system the pipes 2 and 3 and an intermediate shorter pipe length 4 are supported by a self propelled carriage 1, incorporating an endless track 7, connected by a link 6 to a further carriage supporting the pipe 3. A clamping assembly is pivoted to the carriage 1 at 8 and comprises clamps 9, 10 for the pipes 2, 3 capable of being drawn together by a ram 11, and jaws 13 for the length 4, carrying a drive ring 14 rotatable by a motor. A double-acting ram 20 connected between the clamp 9 and the ring 14 positions the length 4. In use with the pipes 2, 3 clamped, the length 4 is rotated or oscillated and the pipes 2, 3 are then brought together until the rubbing surfaces soften, the position of the length 4 being continuously adjusted by the ram 20 to obtain identical conditions at both ends, the rotation or oscillation is stopped and the ram 11 continues to apply a force until the welds harden. A control apparatus receiving information from gauges measuring flow of metal at the weld zones and optical pyrometers measuring temperature at the weld zones, controls the operation of the ram 20. The intermediate member may be a circular collar or two collars bolted together. Two pipes at an angle to one another or two pipes of different diameters may be joined and a pipe may be joined to a flange, a valve or T-shaped conduit employing a suitable intermediate. |
