Device for welding plastic foils

Device for welding of plastic films along a weld at which the foil layers (42, 44) lie flat on each other, with a welding head (10) and a transport means (38, 60) a relative movement between the welding head and the film layers (42, 44 ) produced along the weld seam, characterized in that the welding head is a plasma nozzle (10) that generates a directed onto the film plies plasma jet (34).