A concept with a floor-mounted rail system is frequently required if the components being worked upon have a length of more than 2,500 mm. For length variety of products between 1,200 mm up to 4,000 mm a robot track solution is required. The arc welding robots are installed on a mobile carriage (driven by an external axle of the robot) and can thus cover the necessary work area. This concept is available as single station and multi-station as well. For this purpose, the components are fixed and positioned in dedicated welding fixtures mounted at positioners (external axes of the robot) with counter bearings.