Specifications Steel Cage Seam Welders/ Roller welder/ Cage Welding Machine: Application: Widely used to reinforced concrete pipe factory, put the steel rebar cage into concrete pipe can improve the pipe strength, more durable. Capacity: 1) Diameter range: 300-1200mm, 1200-3000mm (different range, different machine) 2) Max. length: 4m 3) Hoop bar diameter: 4-8mm 4)The welded cage framework can be for flat joint, tongued & grooved joint, bell & spigot joint concrete pipes. 5) Production speed: 4-15 minutes per piece Features: 1)The diameter is varied online automatically, controlled by PLC. 2) In full stroke, the diameter can be varied automatically and shifted very quickly. 3) Vertical bars are clamped pneumatically, not manually load & unload the framework. 4) Special designed synchronizer to ensure no twist on the formed framework. 5) Auto alarm for faults and mis-operation. 6) Imported PLC, inverter, encoder and touch screen.