Abstract: An axially movable electrode holder of metal, particularly copper or copper base alloy, for active parts of consumable or slowly consumable material, which are attachable by means a threaded nipple or a similar means. The electrode holder comprises a cooling unit with a supply and a return duct, and has at least partly, preferably its lower region, a protective coating and a contact arrangement on its sheath area by which the electrode holder may be connected to a current supply. The electrode holder further comprises a number of removably mounted electrical and/or mechanical contact moldings of pressure-resistant material extending over a length of the electrode holder which corresponds too at least a part of the length of an allowable tip consumption. The electrode holder, which is intended for use in the electric steel production, is characterized by a high reliability in service, good maneuverability, and good electrical properties.

Abstract: An arc furnace electrode for the production of electric steel, comprising a metallic top portion and a consumable, replaceable bottom portion threadably interconnected. The top portion is provided with coolant feed and return ducts and includes a protective covering. The protective covering is represented by a detachable surmounted sheath of electrically conductive heat resistant material. The sheath is subdivided into individual segments. The electrode includes internally disposed recesses advantageously accommodating elastic and electrically conductive materials especially advantageous properties.

Abstract: Electrode for arc furnaces, more particularly for electrosteel production, also using scrap, comprising a detachable top portion (5) of metal and a replaceable bottom portion (6) of material which is consumed, where appropriate only slowly, having substantially cylindrical shape and being interconnected by a screw nipple (1) or the like and the top portion has a liquid cooling device with a header duct (2) and a return duct (3) and an inner part (16) and an outer part (17) of the top portion are constructed so as to be detachable from each other, so that the inner part (16) contains the liquid conducting chamber with header duct and return duct and the outer part (17) surrounds only a portion of the inner part (16). The electrodes have a reliable coolant conducting system, are easy to maintain and can be simply repaired in the event of mechanical damage while minimizing electrode down times.

Abstract: A composite electrode for an arc smelting furnace comprising a water cooled aluminum upper clamped section 12, a hollow metal nipple 42, protected by refractory rings 46 in the unclamped area and a consumable graphite electrode 54.

Abstract: A composite electrode for an electric arc smelting furnace has a metal liquid cooled upper clamped section, a consumable graphite lower section and a metal liquid cooled connecting pin. The upper section is fitted with rectangle-shaped tiles of graphite (33) over the area of the electrode held in the electrode power clamp during furnace operation.

Abstract: Apparatus for disconnecting a residual portion of a consumed graphite electrode from a permanent electrode which has been lifted out of an electric furnace and which may still be hot, and for connecting a fresh graphite electrode portion to the permanent electrode, comprises a housing for surrounding the electrode assembly in the region of a screw nipple on the permanent electrode. Disposed in the upper region of the housing is an upper clamping means for holding the permanent electrode, while disposed in the lower region of the housing is a lower clamping means which can produce a screwing movement for unscrewing and screwing on the graphite electrode portion. The housing is of a double-walled construction to provide for water cooling thereof.