Abstract: A method particularly adapted for alloying a coating on a steel strip. The invention uses an induction heating furnace to produce a galvannealed product. In particular, the operating frequency to the heating coils of the furnace is modulated to avoid a resonant vibration in the steel strip through the heating zone of the furnace. Preferably the invention comprises imposing a frequency modulation on the operating frequency of the power signal to the heating coils.

Abstract: A method and apparatus particularly adapted for alloying a coating on a steel strip. The invention uses an induction heating furnace to produce a galvannealed product. In particular, the operating frequency to the heating coils of the furnace is modulated to avoid a resonant vibration in the steel strip through the heating zone of the furnace. Preferably the invention comprises imposing a frequency modulation on the operating frequency of the power signal to the heating coils.

Abstract: An induction heater is provided for heating electrically conducting workpieces. The heater comprises an induction coil having a number of turns including long straight conductors wherein a major portion of the long straight conductors are secured to a concrete support beam. The conductors and the support beam vibrate together in response to electromagnetic field forces generated during operation of the heater. The coil is caused to vibrate with the coil support beam by a hard adhesive which bonds the support beam and the coil or by tension members which hold the coil tightly to the support beam.