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Haoyu CNC Automatic Longitudinal Seam Welding Machine for Tank Pipe Cylinder Duct. PLC & HMI Control: Japan Omron PLC with touch screen for easy parameter input and fault alarm. Wide Application Range: Handles workpiece diameters 200-750mm and thickness 0.6-4mm for steel and aluminum. Precision Welding: Pneumatic positioning and adjustable torch ensure flat seams and no deviation. Water Cooling System: Equipped with water cooling and back side shield gas for stable performance. 12-Month Warranty: Covers mechanical defects with free replacement of defective parts. Versatile Welding Modes: Supports TIG, MIG, and Paw welding modes for diverse requirements.