... , nozzle, ring welding of hydraulic cylinder 1. HYDRAULIC CYLINDER WELDING MACHINE [BOTTOM AND BAR WELDING] EQUIPMENT DISCRIPTION: It is used for ... seam in barrel and axis, such as transmission shaft, axle, hydraulic ram, puncher, piston stem, pressure container, water tank, tube union ... [r/min]0-20-20-20-20-22. RING WELDING MACHINE OF HYDRAULIC CYLINDER Hydraulic cylinder machine