The welding positioner is a device used to drag the workpiece to be welded to move the weld to the desired position for welding. Generally speaking, manufacturers of welding operation machines, roller frames, welding systems and other welding equipment mostly produce welding positioners; manufacturers of welding robots mostly produce welding positioners for robots. However, companies with welding positioners as the leading products are very rare. Germany's Severt Company, the United States Aroson Company, etc., is a typical manufacturer of welding positioners. Germany's CLOOS, Austrian igm, Japan's Matsushita Robotics Co., Ltd., all produce welding positioners for servo control and robots.