Principle
Induction furnace has the same principle as a transformer. A
high- frequency current is passed through a water-cooled coil which acts as the
primary coil of a transformer. The
charge i.e. steel scrap or other conductive metal, acts as the secondary coil of a transformer. The
high-frequency alternating current passing through the primary coil generates a
magnetic flux which cuts the secondary coil i.e. the metallic charge and
induces an electromotive force, emf, in the charge and the charge gets heated
up. When the temperature rises above the melting point of the metallic charge,
it changes to liquid phase and tapped out of the furnace for further
processing.