Patent ID: 7057131

Claim:
A stationary welding device for the longitudinal welding of profiles, comprising transport elements ( 31 , 32 , 34 , 4 , 8 , 9 ) for transport of a profile ( 2 , 5 , 13 ) through a welding device ( 1 ), the transport elements ( 31 , 32 , 34 , 4 , 8 , 9 ) being fashioned such that movement of the profile can be braked at selectable intervals from a constant production speed down to stoppage of the profile ( 13 ), and can subsequently be accelerated back to the production speed, and at least one welding head ( 14 , 15 ) that produces a weld point ( 20 , 21 ) in order to manufacture a weld seam ( 22 , 23 ) on the profile ( 13 ) running through the welding device ( 1 ), application of welding energy to the profile ( 13 ) being switched off below a threshold transport movement speed of the profile ( 13 ), the welding head ( 14 , 15 ) being arranged so that a location of the weld point ( 20 , 21 ) can be moved along a direction of transport ( 12 ) of the profile ( 13 ), and a control system for the welding head ( 14 , 15 ), controls the location of the weld point ( 20 , 21 ) so that the weld point is moved in the direction of transport ( 12 ) while the welding energy is switched off, beginning from an initial position in a region where the weld seam has ended, each time the profile ( 13 ) is at a standstill, the weld point ( 20 , 21 ) being moved back to the initial position where the weld seam ended, against the direction of transport ( 12 ), after the restarting of the transport movement and exceeding of the threshold transport speed at which the welding energy is switched on.