| 摘要 |
A method and a device for the longitudinal welding of profiles ( 2,5, 13 ) is provided in which a profile ( 13 ) that is to be provided with a weld seam ( 22, 23 ) is guided through a welding device ( 1 ), and in the welding device ( 1 ) a welding head ( 14, 15 ) produces a weld point ( 20, 21 ) on the profile ( 13 ), in order to manufacture a weld seam ( 22, 23 ). The profile movement is braked at selectable intervals from an essentially constant production speed down to the point at which the profile ( 13 ) is at a standstill, and is subsequently accelerated back to the production speed, while the application of welding energy to the profile ( 13 ) is switched off below a threshold transport speed. In order to avoid a gap in the resulting weld seam ( 22, 23 ), according to the present invention a welding head control system is used, with the aid of which the location of the weld point ( 20, 21 ) is moved in the direction of transport ( 12 ) of the profile ( 13 ), beginning from an initial point, each time the profile ( 13 ) is at a standstill, the weld point ( 20, 21 ) being moved back to the initial position, against the direction of transport ( 12 ) upon restarting of the transport movement after the threshold transport speed has been reached.
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