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1. Applied Range
Steel pipe specification: Round pipe: φ219~φ325mm
Square pipe: 300×300mm~400×400mm
Steel pipe thickness: 6.0~12.0mm
Welding pipe type: Round pipe/square pipe/rectangular pipe
Welding mode: Induction welding/Contact welding
Typical welding speed:
For square pipe: 300×300×12mm, adopts induction welding mode, welding speed: ≥12m/min
For square pipe: 300×300×12mm, adopts contact welding mode, welding speed: ≥16m/min
For square pipe: 400×400×12mm, adopts induction welding mode, welding speed: ≥12m/min
For square pipe: 400×400×12mm, adopts contact welding mode, welding speed: ≥16m/min
2. Main Technical Index of 700kW Solid State H.F. Welder
( 1 )Designed parameters
Nominal power: 700kW
Rated DC power: Pd=840kW
Rated DC voltage: UdN=450V
Rated DC current: IdN=1870A
The whole efficiency: η≥85%
Output power: Pout > 700kW
Designed frequency: f=150~250kHz
MOSFET inverter: 120kW×7
Tank circuit output mode: no welding transformer output, secondary resonance
( 2 ) Power distribution requirements
Nominal power: 700kW
Rated DC power: Pd=840kW
Line-in power factor: COSφ≥0.85
Power distribution capacity: S≤980kVA
Power supply voltage: 3-phase 380V/50Hz
Line-in current: I=1520A
Line-in cable: each phase adopts three pieces of 240mm2 copper cable connected in parallel, 3-phase 4-line
( 3 ) 700kW:
With the adoption of water-water heat exchanger
Pressure of inner circulation water: 0.15~0.25MPa
Flow of inner circulation water: 36m3/h
Temperature of inner circulation out water: ≤40°C
Temperature of inner circulation back water: ≤55°C
Heat exchanger area: 25m2
Flow of external circulation water: 70m3/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: ≥70m3(provided by user)
GGP700KW solid state HF steel tube welder