Other

Mikhail Isaakovich Zax

David Grigorievich Bykhovsky

Alexandr Yakovlevich Medvedev

Jury Alexandrovich Bogorodsky

Alexandr Yakovlevich Finkelshtein

In a method for striking a main arc between the electrode and nozzle of a plasmatron there is initiated with the aid of high-frequency discharge an intermittently-arcing pilot arc whose flame bridges under the influence of a gas fed into the plasmatron the gap between the electrode of plasmatron and workpiece, completing thereby the circuit of main arc. The amplitude of pilot arc current is selected so as to be roughly equal to the steady current of the main arc whereas the frequency and on-off time ratio of the current are selected so as to assure that the flame of pilot arc is sustained unceasingly throughout the arcing of visually-monitored pilot arc. The method for striking a main arc is embodied in an apparatus wherein the electrode and nozzle of the plasmatron are connected to opposing terminals of a source of power so that interconnected between the electrode and nozzle of plasmatron there is an oscillator and between the nozzle and source of power is a RC-circuit serving as a switching device in the electrode-to-nozzle circuit and, further, the nozzle and workpiece are interconnected by the RC-circuit and an inductance, L, connected in series.

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Saint-Petersburg, Russia

Mikhail Isaakovich Zax