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Claude OBERLIN: Responsible for the Electrothermics section of the Electrical Engineering textbook - Deputy Head, Electricity Applications in Industry Department, Studies and Research Division, Électricité de France
INTRODUCTION
Induction heating is the process of transferring electrical energy from a primary circuit to a metal part forming a secondary circuit, in which Joule losses are transformed into heat. Energy transfer is based on the properties of induction.
Induction allows energy to be transmitted directly into the product, without any physical contact. It ensures very high power densities (up to 4-6 MW/m 2 ), rapid heating, high temperature accuracy and generally very good efficiency. This is why induction heating is widely used for heating prior to deformation, for all heat treatments and heating of wires, tubes and strips, and for assembly operations such as welding or brazing.
In this article, we will focus mainly on application to steel. Other metal alloys are dealt with elsewhere.
Figure 1 summarizes the thermal interventions in the first steel transformations and the associated operations.
Readers are referred to the article "Electromagnetic induction heating
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Induction heating for metal processing
Reheating before metal forming
Bibliography
In Engineering Techniques
Congress
CFE Congress, Induction and its industrial applications, Strasbourg, March 1991.
ATTT-CFE Congress, Induction treatment, Paris, December 1994.
CFE Congress, Induction in industrial processes, Paris, May 1997.
Competence centers in France
CREFACI Laboratory, École des Hautes Études Industrielles, Service Études-Recherches.
IRSID Laboratory, Maizières facility.
CIREP, SACILOR Group.
École des Mines Nancy, Metallurgy Laboratory.
EDF/R&D Division, Electricity Applications in Industry Department.
SUPELEC, Paris Electrical...
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ACES INDUSTRY.
AJAX MAGNETHERMIC.
ASEA BROWN BOVERI SA, Industrial Division - Industrial Furnaces.
ATELIERS BERNARD ET BONNEFOND.
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AUTOMOBILES CITROËN, Direction Méthodes et Moyens Industriels.
AUTOMOBILES PEUGEOT, MGM/STG....
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