... - Bottom, nozzle, ring welding of hydraulic cylinder 1. HYDRAULIC CYLINDER WELDING MACHINE [BOTTOM AND BAR WELDING ... and axis, such as transmission shaft, axle, hydraulic ram, puncher, piston stem, pressure container, water ... auto-control welding: Work piece locked by tail cylinder → Torch move down by pneumatic → Circular seam ... . RING WELDING MACHINE OF HYDRAULIC CYLINDER Hydraulic cylinder machine