1. Composition

2. Technical Parameter

a. Rated output power: 150KW

b. Rated DC voltage: U_dN=235V

c. Rated DC current: I_dN=750A  

d. Output frequency: f=300~350KHZ

e. Efficiency: η≥85%

f.  Power factor: 0.88

g: Ripple coefficient: <1%

h. Power distribution capacity:230KVA   

i. Input voltage: Three phase 380V/50Hz,3 phase 4 wire system

j. Rated input current: I=397A

k.Cooling water pressure:0.25MPa

l.Cooling water flow:11.7m³/h

m:Input water temperature:<35°C

 3. Features of Solid State H.F Welder

    QGT-1 series solid state H.F welder is specially designed for straight seam welding. It adopts high power components of US IR IRFP460 MOSFET and Germany IXYS Company DSEI60-06A rapid recovery diode.The high power capacitor C and inductor coil L compose current-mode parallel upper-voltage resonance circuit, which doesn’t need output transformer. Thus, it not only improves the efficiency, but also increases the reliability of the welder.

    The solid state H.F welder has such distinct features as energy-saving, effective welding, simple structure, easy maintenance, low failure rate, low maintenance cost etc.

3.1 Simple circuit and flexible installation

    Using series-parallel complex resonance circuit, the power only needs to connect main circuit cable between rectifier power supply and the transformer and inverter unit. The installation only needs 2-3 days under good support of the user.

3.2 Complete protection and easy maintenance

    Equipment has perfect failure alarm and fault display system. Once there is a failure, the LCD can show the fault location clearly, so that maintenance personnel can quickly find out the cause of the failure and troubleshoot.

3.3Small harmonic interference, no pollution to the power grid

    With the transformer, RC and LC filter network, the harmonic of solid state H.F welder is small.When solid state H.F welder operates at full power, the power factor can reach 0.9 or more.

3.4 High efficiency, power saving and less cooling water

    Compared with the vacuum tube welder, the solid state H.F can save 25%-30% power. It doesn’t’ need reservoir for out water, thus, the cooling water consumption reduces by 70%.

3.5 Less welding spatter, good welding quality

    The power supply waveform of solid state H.F is stable, and the steel tube weld tends to be a straight line. The tests of drawing, flattening, flaring, water pressure and other performance are qualified.