Transverse flux induction heating

FOR SEVERAL years following 1941, the author was engaged in the development of radio-frequency induction heating for the flow-brightening of electrolytic tin plate. Lines are in operation today melting the electrolytically deposited tin coating on 30-inch-wide steel strip at speeds of 1,300 feet per minute with a power input of 1,200 kw to the strip. The radio-frequency currents flow in rectangular helical coils around the strip and induce currents in the strip and heat it without contact. The magnetic field and the flux through the coils are directed along the length of the strip and the author chooses to call this method “longitudinal flux induction heating.”