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Circular Welder Hydro Cylinder Welding Machine. PLC Touch Screen Control: PLC controls operation with HMI for presetting, saving, and recalling welding parameters. High Precision Welding: Ensures level 1 flaw detection with uniform appearance and good fusion depth/width. Wide Applicability: Handles workpiece diameters 80-300mm and lengths 300-2000mm for hydraulic cylinders. Flexible Oscillation: Supports welding wide and multi-layer seams with adjustable oscillating and lifting mechanisms. Stepless Speed Control: Workpiece rotation speed adjusted by inverter for improved reliability and uniformity. Multi-Layer Welding: D/A control allows presetting and recalling current/voltage for continuous multi-layer welding.