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

Institut Elektrosvarki Imeni E.o. Patona Adakemii Nauk

Gary A Melnik

Boris E Paton

Alfred Iosifovich Bukalo

Jury V Latash

Gennady Fedorovich Torkhov

Anatoli Ivanovich Chvertko

Oleg S Zabarilo

Victor Iosifovich Lakomsky

Konstantin S Tolstopyatov

Viktor Iosifovich Lakomsky

Igor S Pryanishnikov

Georgy Mikhailovich Grigorenko

Nikolai A Tulin

Sergei Panteleevich Bakumenko

Mikhail M Kljuev

Vladimir V Goncharenko

Boris P Sokolkin

Valentin V Topilin, Deceased

Sergei G Guschin, Deceased

Stanislav S Ivanchenko

By Ljudmila Korobkova, Administrator

By Alevtina Guschina, Administrator

Ljudmila G Odintsova

By Tatyana Kuznetsova, Administrator

Gavriil D Agarkov

Sergei E Gedzun

Nikolai P Pozdeev

Valery D Azbukin

Vladimir K Kedrin

Anatoly R Slobodian

Jury I Modelkin

Lev R Tager

Mikhail K Zakamarkin

Georgy N Okorokov

Nikolai I Zamulo

Vasily A Tkalich

Alexei K Andrianov

By Tatyana Topilina, Administrator

Vitaly S Nesmikh

Gennady G Vedernikov

Nikolai V Letnikov

Vladislav V Tetjukhin

Anatoly A Zhdanovsky

Nikolai V Reida

The method consists in that a flat work in an initial position is oriented horizontally between cooled mold beams. Plasma torches are arranged in line across the parallel side edges so that the anode spots of the extreme torches are confined by said edges of the work. By supplying a plasma forming gas and electric current to the plasma torches the work is heated with the formation of a metal pool which extends across the work from edge to edge. By relatively moving the work and the plasma torches in a horizontal plane and along the edges of the work movement of the metal pool over the surface thereof is effected and thereby a remelted layer as thick as the pool is deep, is obtained. The apparatus for carrying out the method comprises a sealed chamber containing a mold having two beams arranged in a horizontal plane and being parallel to one another. Installed in the chamber are plasma torches mounted on shafts and connected through supply lines with the sources of plasma forming gas, electric current and cooling water. Each of the shafts is journalled in a sealing bush installed in the wall of the sealed chamber so that the axis of the shaft is parallel to the beams. Each shaft is rotatively driven by a drive. The apparatus further comprises a drive for relatively moving the work and the shafts in the plane parallel to the beams, connected with at least one of the elements taking part in such movement. The practice of the method with the help of the apparatus of the invention permits a high-quality work of a predetermined macrostructure of a surface layer, to be produced at a higher rate of treatment.

Method of the plasma jet remelting of a surface layer of a flat metal

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

In a plasma-arc torch for melting metals the electrode assembly comprises an electrode holder made of copper alloys and having a butt portion which rigidly secures a tungsten electrode by means of diffusion welding. The invention provides for a welded joint between the electrode and the electrode holder, a nonconsumable current-conducting interlayer made of titanium, copper and tungsten being placed therebetween.

Electrode assembly for plasma arc torches

A plasma arc remelting furnace system with improved components including mechanisms for independently vertically feeding and oscillating the metal blank through the top of the furnace. Multiple plasma arc torches (plasmatrons) are installed in a sealed chamber and adjustable operators enable angular disposition of individual torches. The torches have improved torch nozzles with heat sink construction enabling operation at higher temperatures, better stabilized plasma arcs and longer torch life. The system can utilize ingot molds of various cross-section shapes, i.e., round, square, rectangular and polygonal and, depending upon mold shape, the number of torches can differ. Operating circuits are provided for use with a plurality of different numbers (up to eight) of torches, either with direct current or alternating current power sources, and possible variations of circuits will enable using a large number of torches.

Furnace construction for plasma arc remelting of metal

A plasma arc remelting furnace system with improved components including mechanisms for independently vertically feeding and oscillating the metal blank through the top of the furnace. Multiple plasma arc torches (plasmatrons) are installed in a sealed chamber and adjustable operators enable angular disposition of individual torches. The torches have improved torch nozzles with heat sink construction enabling operation at higher temperatures, better stablized plasma arcs and longer torch life. The system can utilize ingot molds of various cross section shapes, i.e., round, square, rectangular and polygonal and, depending upon mold shape, the number of torches can differ. Operating circuits are provided for use with a plurality of different numbers (up to eight) of torches, either with direct current or alternating current power sources, and possible variations of circuits will enable using a larger number of torches.

Method of arc control in plasma arc furnace torches

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Kyiv, Ukraine

Gary A Melnik