Works gear-driven drive rollers using friction drive rollers and cylindrical workpieces between the workpiece rotation drive to achieve displacement can be achieved outside the ring and outside the longitudinal seam and horizontal position of the workpiece seam welding, automatic welding equipment ancillary to achieve automatic welding. Application mainly for barrel assembly and welding. If on the height of the main, driven rollers make appropriate adjustments, but also for vertebral segments ranging from the assembled and welded rotating body. For some non-circular elongated weldments, if its chucking in a special annular collar, assembly and welding operations may be performed in the welding roller frame. Welding roller stand also with manual welding as the detection, the cylindrical body of the workpiece assembly equipment. Use welding roller stand can greatly improve weld quality, reduce labor intensity