CIRP Encyclopedia of Production Engineering

2019 Edition
| Editors: Sami Chatti, Luc Laperrière, Gunther Reinhart, Tullio Tolio

Induction Heating

  • Ralf Kolleck
Reference work entry



Induction heating is a method of heating electrically conductive material by internal eddy current losses.

Theory and Application

An induction heating device consists of two components, a high-frequency generator and an induction coil, the so-called inductor. An alternating voltage is applied to the induction coil which results in an alternating current in the coil circuit. In the surroundings of the induction coil, a time-variable magnetic field is produced. When an electricity-conducting component or semifinished product enters this magnetic field, eddy currents are induced in it. These eddy currents are short-circuited and result in heating, based on the Joule effect. In magnetic material, there are also so-called hysteretic losses, which contribute to the heating. The coil current, the alternating field, and the eddy currents have the same frequency (Rudnev et al. 2003). Figure 1shows a conventional...
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  1. Benkowski G (1990) Induktionserwärmung: Härten, Glühen, Schmelzen, Löten, Schweißen [Induction heating: hardening, annealing, melting, soldering and bracing, welding], 5th edn. VEB Verlag Technik, Berlin. (in German)Google Scholar
  2. Kolleck R, Veit R, Merklein M, Lechler J, Geiger M (2009) Investigation on induction heating for hot stamping of boron alloyed steels. Ann CIRP 58(1):275–278CrossRefGoogle Scholar
  3. Rudnev V, Loveless D, Cook R, Black M (2003) Handbook of induction heating, manufacturing, engineering and materials processing. Marcel Dekker, New YorkGoogle Scholar
  4. Tripmacher E (1953) Industrielle Hochfrequenzanlagen [Industrial high-frequency plants]. Nachrichtentechnik (Communications) 3(9):407–411. (in German)Google Scholar

Copyright information

© CIRP 2019

Authors and Affiliations

  • Ralf Kolleck
    • 1
  1. 1.Institute of Tools and FormingGraz University of TechnologyGrazAustria

Section editors and affiliations

  • Ludger Overmeyer
    • 1
  1. 1.Institut für Transport- und AutomatisierungstechnikGottfried Wilhelm Leibniz Universität HannoverGarbsenDeutschland