1.  Applied Range

          Steel pipe specification: φ45~φ89mm

          Steel pipe thickness: 1.5~4.0mm

          Welding pipe type: Round pipe/square pipe/rectangular pipe

          Welding mode: Induction welding

          Typical welding speed: 30~100m/min

2.  Main Technical Index of 250kW Solid State H.F. Welder

( 1 )Designed parameters

          Nominal power: 250kW

          Rated DC power: Pd=300kW

          Rated DC voltage: UdN=450V

          Rated DC current: IdN=670A

          The whole efficiency: η≥85%

          Output power: Pout > 250kW

          Designed frequency: f=300~350kHz

          MOSFET inverter: 60kW×5

          Tank circuit output mode: no welding transformer output, secondary resonance

( 3 ) Power distribution requirements

          Nominal power: 250kW

          Rated DC power: Pd=300kW

          Line-in power factor: COSφ≥0.85

          Power distribution capacity: S≤350kVA

          Power supply voltage: 3-phase 380V/50Hz

          Line-in current: I=540A

          Line-in cable: each phase adopts 240mm² copper cable, 3-phase 4-line

(3 ) 250kW:

          With the adoption of water-water heat exchanger

          Pressure of inner circulation water: 0.15~0.25MPa

         Flow of inner circulation water: 21m³/h

         Temperature of inner circulation out water: ≤40°C

         Temperature of inner circulation back water: ≤55°C

          Heat exchanger area: 12m²

          Flow of external circulation water: 25m³/h(provided by user)

         Temperature of external circulation inlet water: ≤35°C

         Temperature rise of heat exchanger external circulation water: ≤15°C

         Pressure of inlet water: 0.25~0.3MPa (approximately 2.5~3kg/cm²)

         Volume for external circulation water pool: ≥25m³(provided by user)