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AssigneePatent Management, Inc.
InventorsBoris Evgenievich Paton, Jury Vadimovich Latash, Boris Izrailevich Medovar, July Georgievich Emelianenko, Mikhail Markovich Kljuev
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Molten slag is introduced through the lower portion of a crucible device into the bottom of the remelting zone in an electroslag remelting process using single or plural consumable electrodes in an amount sufficient to achieve a predetermined depth in the remelting zone. The achievement of the predetermined depth is signalled when current flows as a result of the slag level contacting and closing a circuit through an energized electrode disposed in the remelting zone. The crucible has a bottom plate at its lower end, the bottom plate has a recess in its top side and a piece of metal is inserted in the recess to provide electrical contact between the piece of metal and the bottom plate the piece of metal in the recess in the bottom plate is connected by a center tap line to an electric current source which passes through the electrode(s), the slag and the piece of metal during initial remelting.
A method for starting up and supplying electric current to an ESR furnace comprised of a consumable electrode means, a mold, a bottom plate having a recess therein and an electric current source comprising the steps of placing a piece of metal in the recess in the bottom plate, controllably connecting at least the piece of metal and the electrode means to the electric current source, cooling the mold and bottom plate, establishing a molten slag pool in the lower end of the mold, bringing the consumable electrode means and the molten slag pool into contact, supplying electric current from the current source to the furnace for a period of time sufficient to allow the consumable electrode means to be remelted in the slag pool and to progressively resolidify the metal to form an ingot under the slag pool, integrating the piece of metal in the bottom plate recess with the ingot being formed during the initial remelting, and continuing the remelting to form a complete ingot.
In a method of electroslag remelting of metal from a consumable electrode means in which at least one consumable metal electrode is disposed with its lowermost end arranged to be in contact with molten slag in a crucible and progressively melted in said slag through the application of electric current, said crucible having a bottom plate at the lower end thereof and the bottom plate having a recess in the top side thereof, and improvement comprising pressing a piece of metal (weld lug) against the side wall of the recess to provide electrical contact between the weld lug and the bottom plate, introducing slag in a molten state into the crucible through at least one passage formed through the crucible adjacent the lower portion thereof, and bringing the consumable electrode means and the molten slag pool into contact to commence the remelting.
In a method of electroslag remelting of metal from consumable electrodes in which at least one consumable metal electrode with upper and lower ends is disposed with its lowermost end arranged to be immersed in molten slag in crucible means having fluid cooled wall means and progressively melted in said slag through the application of electric current, said crucible means having a fluid cooled bottom plate at the lower end thereof, the bottom plate having a recess therein, the improvement comprising, in the beginning of the remelting process, placing a piece of metal in the recess in the bottom plate, introducing slag in the molten state into the fluid cooled crucible means through at least one port formed through the crucible means adjacent the lower portion thereof, causing the molten slag and the lower end of the consumable electrode to come into contact, and with the electrode in contact with the molten slag, passing electric current through a circuit including the electrode, the molten slag and the piece of metal and integrating the piece of metal with the ingot being formed during initial remelting.
Dependencies are inferred from the claim text.