Patent ID: 6873641

Claim:
A method for periodic elongation of an electrode column for an electric arc furnace, comprising: screwing onto an acting electrode of the electrode column, a new electrode by means of a threaded nipple having a longitudinal through hole therein, the new electrode having a cavity and there being cavities between the acting electrode and the nipple, and at a bottom of a threaded socket of the new electrode; and placing into the nipple through hole, a metal staged rod having a bigger diameter portion in the cavity of the new electrode, the melting temperature of the rod being lower than a working temperature of the acting electrode in the furnace, and the electric resistance of the rod being lower than the electric resistance of materials of each electrode and the nipple, and the volume of the rod being chosen to provide, after melting of the rod, filling up of the cavities between the nipple and the acting electrode after their screwing together, the through hole in the nipple, and at least the cavity between the nipple and the bottom of the threaded socket of the new electrode.