Institut Elektrosvarki Imeni E.o. Patona Akademii Nauk Ukrainskoi Ssr

Oleg S Zabarilo

Boris E Paton

Jury V Latash

Gary A Melnik

Alfred Iosifovich Bukalo

Nikolai A Tulin

Sergei Panteleevich Bakumenko

Valery D Azbukin

Anatoly R Slobodian

Vasily A Tkalich

Nikolai V Letnikov

Mikhail K Zakamarkin

Vladislav V Tetjukhin

Nikolai P Pozdeev

Anatoly A Zhdanovsky

Georgy N Okorokov

Gennady G Vedernikov

Vladimir V Goncharenko

Stanislav S Ivanchenko

Ljudmila G Odintsova

Gavriil D Agarkov

Nikolai I Zamulo

Sergei E Gedzun

The proposed method relates to the ionization of plasma-generating gas in a ilot arc before being supplied to the electrode region, thus generating charges in this electrode region, the charges promoting dispersion of an arc spot. For this purpose, an electrode assembly is provided within the plasma-arc torch, which electrode assembly comprises a hollow tungsten electrode and a solid electrode of the same metal, the solid electrode being radially spaced from the hollow electrode. Both electrodes are put in an electric power circuit, whereby an arc is initiated between the electrodes when switching on the electric circuit, plasma being generated in the arc, which plasma serves to start the main arc and provides for dispersion of the arc spot over the surface of the hollow electrode. This decreases the current density in the arc spots and, hence, minimizes electrode erosion. Such an arrangement provides for the nozzle to be electrically insulated from the electrodes and, therefore, protected against harmful damage.

Method of generating plasma in a plasma-arc torch and an arrangement for

A plasma-arc furnace comprises a casing with plasma torches, particularly ree torches, mounted therewithin in symmetrical relationship relative to the vertical axis thereof. Each of these torches comprises a body provided with a nozzle and an axial conduit for feeding a plasma-forming gas therethrough, and a cylindrical electrode disposed within said conduit. According to the invention, the distance between the centers of working ends of electrodes disposed within adjacent plasma torches is not more than 15 diameters of the electrode.

Plasma-arc furnace

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Kyiv, Ukraine

Oleg S Zabarilo