An induction furnace is an electrical furnace in which the heat is applied by induction heating of “V: Coreless Induction Furnaces”. Electric Melting Practice. Calderys offers refractory solutions for all parts of Coreless Induction Furnaces, whether you are melting non-ferrous alloys with melting points below °C. Solutions in dry ramming mix; Installation by Vibrosystem; Solutions with CPS ( Crucible Preformed System); Service at the installation and start- up; After-sale.

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Coreless Induction Furnace

Most suitable for the production of high-grade alloy steels. Unsourced material may be challenged and removed. The frequency may vary from 50 Hz to 8 MHz depending upon the type of work done. Since the eddy current loss is proportional to the product of the square of supply frequency and square of flux density, therefore by controlling the flux density and supply frequency the amount of heat can be controlled.

An induction furnace consists of a nonconductive crucible holding the charge of metal to be melted, surrounded by a coil of copper wire. Retrieved from ” https: The initial cost is more as compared to arc furnace.

The material to be heated is placed inside the coil. The capacities available vary from 50 Kg to about 20 tones. In ferromagnetic materials like ironthe material may also be heated by magnetic hysteresisthe reversal of the molecular magnetic dipoles in the metal.

A channel-type induction furnace has a loop of molten metal, which forms a single-turn secondary winding through an iron core. Since the power factor does not remain constant during the operation of the furnace, the capacitance in the circuit during heat cycle is varied to maintain power factor approximately unity.

The eddy currents produced in the charge not only heat it up but also account for the stirring action. The metal to be heated is placed within a high-frequency current carrying coil. An operating induction furnace usually emits a hum or whine due to fluctuating magnetic forces and magnetostrictionthe pitch of which can be used by operators to identify whether the furnace is operating correctly or at what inductin level.


An induction furnace is an electrical furnace in which the heat is applied by induction heating of metal. Simple charging and pouring, precise control of power. The frequency employed depends upon the size of the coreless induction furnace.

The coreless induction furnace is chiefly used for melting of steel and other ferrous metals. The automatic stirring action produced by eddy currents. Please help improve this article by adding citations to reliable sources. The operating power factor of such furnaces is very low between 0.

Coreless Induction Furnace – your electrical guide

Bloomery produces sponge iron Blast furnace produces pig iron Cold blast Hot blast Anthracite iron Direct reduced iron. A powerful alternating current flows through the wire. The furnacw of the induction furnace is a clean, energy-efficient and well-controllable melting process compared to most other means of metal melting. Please share it, your one share can change my life.

Annealing Low hydrogen Short circuit. To reduce copper losses, hollow copper tubes are used in which cold water is circulated. An advantage of induction heating is that the heat is generated within the furnace’s charge itself rather than applied by a burning fuel or other external heat source, which can be important in applications where contamination is an issue.

Your email address will not be published. American Society for Metals. High-frequency eddy current heating is frequently used for forging and annealing. Smelting Bloomery produces sponge iron Blast furnace corelss pig iron Cold blast Hot blast Anthracite iron Direct reduced iron. Power loss due to eddy currents is eddy current loss and appears in the form of heat.

British Electrical Development Association.

The primary is wound over the crucible itself. Once melted, the eddy currents cause vigorous stirring of the melt, assuring good coreelss. Iron laminations are provided outside the primary winding to create a low reluctance path for flux and also contain the stray field which may otherwise induce the heavy current in supporting steel structure. Bessemer process Open hearth furnace Inductuon arc furnace Basic oxygen process.


By doing so alternating magnetic field is set up, eddy currents are induced in the metal piece and heat is produced in it. In other projects Wikimedia Commons. In this case, also the charge to be melted is made the secondary of the transformer. The one major drawback to induction furnace usage in a foundry is the lack of refining capacity; charge materials must be clean of oxidation products and of a known composition and some alloying elements may be lost due to oxidation and must be re-added to the melt.

For the same conductivity, the higher frequencies have a shallow skin depth—that is less penetration into the melt. Views Read Edit View history.

Most modern foundries use this type of furnace, and now also more iron foundries are replacing cupolas with induction furnaces to melt cast ironas the former emit lots of dust and other pollutants. From Wikipedia, the free encyclopedia.

The heat in the material to be heated is produced by eddy currents. The process is economical for continuous heating. Leave this field empty. History of ferrous metallurgy List of steel producers. No core is provided in the coreless induction furnace. This is also known as the induction niduction. For coreless induction furnaces power supply is obtained from ordinary supply system and its frequency is converted to the higher value by means of oscillators.