The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 14, 1986
Filed:
Dec. 30, 1983
Boris E Paton, Kiev, SU;
Gary A Melnik, Kiev, SU;
Jury V Latash, Kiev, SU;
Oleg S Zabarilo, Kiev, SU;
Vasily A Tkalich, Kiev, SU;
Sergei E Gedzun, Kiev, SU;
Ljudmila G Odintsova, Kiev, SU;
Gavriil D Agarkov, V.Salda, SU;
Vladislav V Tetjukhin, Moscow, SU;
Nikolai A Tulin, Moscow, SU;
Gennady G Vedernikov, Chelyabinsk, SU;
Nikolai P Pozdeev, Chelyabinsk, SU;
Valery D Azbukin, Chelyabinsk, SU;
Georgy N Okorokov, Moscow, SU;
Nikolai V Letnikov, Elektrostal Moskovskoi oblasti, SU;
Abstract
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.