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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）