| 摘要 |
The invention relates to a method and to a device for joining two lengths of pipe by laser welding. The two lengths of pipe (1, 2) are held in place edge to edge by their ends (3); the end of one length of pipe (1) is fastened to a plate (11) which can rotate substantially about the axis of the lengths of pipe; the said plate (11) is fastened to a device (13) which focuses the laser radiation for the purpose of carrying out the welding, allowing the said focusing device (13) to be moved with respect to the plate (11); the device (13) for focusing the laser radiation is moved with respect to the rotary plate (11) in order to keep it constantly in the position that it has to assume in order to carry out optimum welding, while the plate (11) is rotated about the lengths of pipe at a speed corresponding to the speed of welding; the laser radiation is transmitted from a generator (8) to the focusing device (13) by means of an optical path (14) comprising an articulated arm (14b, 14c). <IMAGE>
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