The CLOOS tactile sensor uses the torch gas nozzle, the welding wire or a separate tracer pin to determine the start and/or end of the weld seam and corrects the programmed welding path. In the case of a V seam, the CLOOS tactile sensor also measures the seam volume. Furthermore, the tactile sensor can be combined with the arc sensors. In the case of a V seam, the CLOOS tactile sensor measures the seam volume and calculates the seam volume. Weld parameters can be adapted to the seam volume change. The tactile sensor is normally used together with the arc sensors.