INDUCTION HEATING  Electro-magnetic induction was first recognized by Michael Faraday in 1831 and is the basis for generator and transformer operation. Alternating current flowing through a conductor establishes a magnetic field around the conductor. Conductive materials in close proximity link with this field and a voltage is induced into them. Resulting current flows are seen as heat. There is no physical contact between the coil and workpiece. Permeability (magnetic properties), resistivity, physical size of the part to be heated, heating rate and required temperature determine the size and frequency of the induction heating system required for an application.

BENEFITS OF INDUCTION HEATING Non Contact   Heating remains consistent without being affected by variables such as contact resistance or rate of heat transfer through changing surface conditions. Heating can take place within non conductive containers and directly through surface coatings. The  cathode tube element at right is heated within the glass tube to drive off impurities. Electronic Control  Instant On/Off and control of power level. Interface with process controllers and temperature control systems is easily accomplished.

Precise Heat Input   Heating  is applied at  only the location needed.  The stainless steel bellows (left photo) is silver soldered to top and bottom fittings simultaneously. Coils can be shaped to provide different temperatures at each region.   Safe, Flameless  No open flame to endanger the operator or obscure the process. Heat goes directly into the part and provides a cooler and friendlier working environment.  Non conductive materials do not heat.

Repeatable  Heating remains constant with each cycle. No warm up period or heater adjustments are required. Variations in incoming power are automatically compensated for. Parts are heated with identical results based on a timed cycle. Heating rate can be varied automatically to correct for changes in ambient temperature. Optical pyrometers or thermocouples can interface directly with heater controls.

Economical  Induction heating often proves to be the best and most profitable alternative. Heating is fast. Energy is not wasted between heats. Scrap rates are reduced. The induction method heats magnetic materials with slightly greater efficiency due to hysteresis but all metals can be heated by induction.

Magneforce Inc.  155 Shaffer Drive, Warren, Ohio, U.S.A. (800) 837-3365