... welding machine : 1,Voltage: 220V, 2,frequency:50/60Hz; 3,Power: 1500W 4,20-40MM sockets PPr welding machine:(1.) welding connector(2.) Plastic pipe welding machine ... (3.) Quality is excellent and professional.we have the ce certification.(4.) Voltage: 220V±10%,frequency ... flange joints. Practical 20-40mm ppr pipe welding machine