... machine - Bottom, nozzle, ring welding of hydraulic cylinder 1. HYDRAULIC CYLINDER WELDING MACHINE [BOTTOM AND BAR WELDING] EQUIPMENT DISCRIPTION: ... seam in barrel and axis, such as transmission shaft, axle, hydraulic ram, puncher, piston stem, pressure container, water tank, tube ... is pneumatic controlled and work piece is on the support rollers. The process of auto-control welding: Work piece locked ...