Method of repairing a water-cooled electrode holder

摘要

A method of repairing a water-cooled electrode holder for use in electric furnaces, of the type comprising a base and a bowl secured to the base for encompassing and supporting a vertical cylindrical electrode. Such holders suffer deterioration in the region of the inner surface of the bowl which is opposite the base. According to the invention, the outer semi-cylindrical portion of the bowl is cut off on a substantially diametral plane and replaced by a new portion. The new portion is formed from a flat slab of copper. To make the water passageways in the new portion match those in the old, a pattern of the locations of the passageways in the old portion is made and transferred to one end of the slab. The slab is then drilled lengthwise at the locations transferred from the pattern, and the holes are filled with sand and plugged. The slab is then bent to U-shape to comprise a semi-cylindrical portion having two straight ends thereon. The plugs are then removed from the straight end portions and the sand emptied, after which tongue and groove connections are machined on the old and new portions, which are then assembled and pinned together and welded.