Electroslag melting method for producing ingots - using reduced power input to non-consumable electrode prior to initial introduction of molten metal into mould

摘要

A current is passed through a non-consumable electrode and a slag pool is formed in a cooling casting mould. The slag pool is heated with the non-consumable electrode and molten metal, i.e. one part of the metal ingot is continuously injected in the casting mould through the heated slag layers. Prior to the first injection of the liquid metal in the casting mould, a rated value of power to the non-consumable electrode, is decreased by a ratio of 20-80%. Used for producing a large billet as a raw material of rotor to a large size dynamo.