... speed, high efficiency, economic Four-point Welding Machine for PVC Window and Door---SHZ4-120*4500Features:Used for welding PVC door-windowPLC control, pneumatic drive, simple, operation, stable ... combinativelyUsed for welding PVC window and doorParameter:Power supply:220V 50Hz Air pressure: 0.4~0.6Mpa Input power:4.5kw Welding Profile Length ...