Ambrell Induction Heating
Ambrell Induction Heating

Glossary of Induction Heating Terms

In case you're not familiar with the technical terms we use to explain induction heating, we've assembled a glossary of induction heating terms for you. 




Curie temperature

The temperature above which a ferromagnetic substance loses its ferromagnetism.

RF; radio frequency

A frequency in the range within which radio waves may be transmitted, from about 3 kilohertz to about 300,000 megahertz.


A boule is a single-crystal ingot produced by synthetic means. A boule of silicon is the starting material for most of the integrated circuits used today.

Capillary action

A phenomenon associated with surface tension and resulting in the elevation or depression of liquids in capillaries.


A hard material made of compacted binary compounds of carbon and heavy metals, used to make tools that cut metal.


Process of treating, combining, or impregnating with carbon, as when casehardening steel.

Controlled atmosphere

A gas or mixture of gases in which steel is heated to produce or maintain a specific surface condition.


Transfer of energy from one circuit to another.


To prepare, preserve, or finish (a substance) by a chemical or physical process

Dew point

The dew point or dewpoint of a given parcel of air is the temperature to which the parcel must be cooled, at constant barometric pressure, for the water vapor component to condense into water, called dew.

Eddy current

Electric current circulating wholly within a mass of metal.

Heating patterns

The pattern of heat transferred to the workpiece from heating portions of the work coil. The heating pattern is the mirror image of the coil.



A link from a hypertext file to another location or file; typically activated by clicking on a highlighted word or icon at a particular location on the screen.


Lagging of an effect behind its cause, as when the change in magnetism of a body lags behind changes in the magnetic field.


The ability of the heating system to induce voltage via a varying current and magnetic field.


Magnetic field

A current flowing in a conductor creates a magnetic field. The field generates a current in the workpiece that’s a mirror image of the current in the work coil. The current in the workpiece is proportional to the field strength.



To cool (hot metal) by thrusting into water or other liquid.


A material which is heated as a result of its presence in the induction field, then passes its heat to the workpiece.

Zinn, S., Semiatin, S.L., Elements of Induction Heating' ,Electric Power Research Institute 1988


To harden or strengthen (metal or glass) by application of heat or by heating and cooling.