| 摘要 |
PURPOSE:To provide a titled welding machine which is decreased of the losses generated by wiring inductance and uses a low voltage circuit for a DC power source part by creating high frequency pulses with an LC resonance circuit consisting of a resonance capacitor and a resonance coil and switching means. CONSTITUTION:In a circuit for a high frequency pulse arc welding machine, 3-phase AC voltage of about 50V is applied to input terminals U, V, W, and a DC power source part 60 is constituted of a 3-phase bridge rectifier circuit 27, a smoothing capacitor 28, a chopper transistor 29 and a control circuit 30 thereof, a diode 31, a chock coil 32, etc. One terminal of a capacitor 33 for resonance connects to the work 36a of arc load 36 via a shunt 35, and the other terminal connects in series to a thyristor 34 for switching means, a saturable reactor 37 for resonance coil, and an electrode 36b. A DC power source 39 of small capacity and an arc starter 40 are connected to the work 36a and the electrode 36b. |
