1. Applied Range l Steel pipe specification: Round pipe: φ50~φ114mm
Square pipe: under 200×200mm
l Steel pipe thickness: 2.5~4.0mm
l Welding pipe type: Round pipe/square pipe/rectangular pipe
l Welding mode: Induction welding/Contact welding
l Typical welding speed: 35~60m/min
2. Main Technical Index of 300kW Solid State H.F. Welder
①Designed parameters
l Nominal power: 300kW
l Rated DC power: Pd=360kW
l Rated DC voltage: UdN=450V
l Rated DC current: IdN=800A
l The whole efficiency: η≥85%
l Output power: Pout＞300kW
l Designed frequency: f=300~350kHz
l MOSFET inverter: 120kW×3
l Tank circuit output mode: no welding transformer output, secondary resonance
②Power distribution requirements
l Nominal power: 300kW
l Rated DC power: Pd=360kW
l Line-in power factor: COSφ≥0.85
l Power distribution capacity: S≤420kVA
l Power supply voltage: 3-phase 380V/50Hz
l Line-in current: I=650A
l Line-in cable: each phase adopts two pieces of 150mm2 copper cable connected in parallel, 3-phase 4-line
③300kW:
l With the adoption of water-water heat exchanger
l Pressure of inner circulation water: 0.15~0.25MPa
u Flow of inner circulation water:25m3/h
u Temperature of inner circulation out water: ≤40℃
u Temperature of inner circulation back water: ≤55℃
l Heat exchanger area: 15m2
l Flow of external circulation water: 30m3/h（provided by user）
u Temperature of external circulation inlet water: ≤35℃
u Temperature rise of heat exchanger external circulation water: ≤15℃
u Pressure of inlet water: 0.25～0.3MPa (approximately 2.5～3kg/cm2)
u Volume for external circulation water pool: ≥30m3（provided by user）
