how does induction heating work?

A source of high frequency electricity is used to drive a large alternating current through a induction coil. This induction heating coil is known as the work coil. See the picture opposite. The passage of current through this induction heating coil generates a very intense and rapidly changing magnetic field in the space within the work coil. The workpiece to be heated is placed within this intense alternating magnetic field. Depending on the nature of the workpiece material, a number of things happen... The alternating magnetic field induces a current flow in the conductive workpiece. The arrangement of the work coil and the workpiece can be thought of as an electrical transformer. The work coil is like the primary where electrical energy is fed in, and the workpiece is like a single turn secondary that is short-circuited. This causes tremendous currents to flow through the workpiece. These are known as eddy currents. In addition to this, the high frequency used in Induction Heating applications gives rise to a phenomenon called skin effect. This skin effect forces the alternating current to flow in a thin layer towards the surface of the workpiece. The skin effect increases the effective resistance of the metal to the passage of the large current. Therefore it greatly increases the induction heating effect of the induction heater caused by the current induced in the workpiece. [pdf-embedder url="https://dw-inductionheater.com/wp-content/uploads/2018/08/induction_heating_principle-1.pdf" title="induction_heating_principle"] https://dw-inductionheater.com/how-does-induction-heating-work.html?feed_id=243490&_unique_id=662e7512c0d85

Induction Heating Basic

Induction Heating Basics

Induction heating takes place in an electrically conducting object (not necessarily magnetic steel) when the object is placed in a varying magnetic field. Induction heating is due to the hysteresis and eddy-current losses. Induction heating is the process of heating an electrically conducting object (usually a metal) by electromagnetic induction, through heat generated in the object by eddy currents. An induction heater consists of an electromagnet and an electronic oscillator that passes a high-frequency alternating current (AC) through the electromagnet. The rapidly alternating magnetic field penetrates the object, generating electric currents inside the conductor, called eddy currents. The eddy currents flowing through the resistance of the material heat it by Joule heating. In ferromagnetic (and ferrimagnetic) materials like iron, heat may also be generated by magnetic hysteresis losses. The frequency of current used depends on the object size, material type, coupling (between the work coil and the object to be heated) and the penetration depth. Hysteresis losses only occur in magnetic materials such as steel, nickel, and very few others. Hysteresis loss states that this is caused by friction between molecules when the material is magnetized first in one direction, and then in the other. The molecules may be regarded as small magnets which turn around with each reversal of direction of the magnetic field. Work (energy) is required to turn them around. The energy converts into heat. The rate of expenditure of energy (power) increases with an increased rate of reversal (frequency). Eddy-current losses occur in any conducting material in a varying magnetic field. This causes heading, even if the materials do not have any of the magnetic properties usually associated with iron and steel. Examples are copper, brass, aluminum, zirconium, nonmagnetic stainless steel, and uranium. Eddy currents are electric currents inducted by transformer action in the material. As their name implies, they appear to flow around in swirls on eddies within a solid mass of material. Eddy-current losses are much more important than hysteresis losses in induction heating. Note that induction heating is applied to nonmagnetic materials, where no hysteresis losses occur. For the heating of steel for hardening, forging, melting, or any other purposes which require a temperature above Curie temperature, we cannot depend upon hysteresis. Steel loses its magnetic properties above this temperature. When steel is heated below the Curie point, the contribution of hysteresis is usually so small that it can be ignored. For all practical purposes, the I²R of the eddy currents is the only way in which electrical energy can be turned into heat for induction heating purposes. Two basic things for induction heating to occur:

• A changing magnetic field
• An electrically conductive material placed into the magnetic field

https://dw-inductionheater.com/high-frequency-induction-heating-basic.html?feed_id=241802&_unique_id=661e08f0ae384

Induction Heating PDF

Induction Heating

•Works like a transformer (Step down transformer –low voltage and high current ) – electromagnetic induction principle

Induction Heating Advantages

• No contact is required between the work piece and the induction coil as the heat source • Heat is restricted to localized areas or surface zones immediately adjacent to the coil. • Alternating current (ac) in an induction coil has an invisible force field (electromagnetic, or flux) around it

Induction Heating Rate

•The rate of heating of the work piece is dependent on the : • Frequency of the induced current, • The intensity of the induced current, • The specific heat of the material (ability to absorb heat), • The magnetic permeability of the material, • The resistance of the material to the flow of current. induction_heating https://dw-inductionheater.com/induction-heating-pdf.html?feed_id=233656&_unique_id=65c40ded01ff3

What Is Induction Heating?

What Is Induction Heating? Induction heating is the process of heating an electrically conducting object (usually a metal) by electromagnetic induction, where eddy currents (also called Foucault currents) are generated within the metal and resistance leads to Joule heating of the metal.Induction heating is a form of non-contact heating,when alternating current flows in the induced coil, varying electromagnetic field is set up around the coil, circulating current(induced, current, eddy current) is generated in the workpiece(conductive material), heat is produced as the eddy current flows against the resitivity of the material.The basic principles of induction heating have been understood and applied to manufacturing since the 1920s. During World War II, the technology developed rapidly to meet urgent wartime requirements for a fast, reliable process to harden metal engine parts. More recently, the focus on lean manufacturing techniques and emphasis on improved quality control have led to a rediscovery of induction technology, along with the development of precisely controlled, all solid state induction power supplies. [caption id="attachment_143" align="alignright" width="500"] induction_heating_principle[/caption] How Induction Heating Work? An induction heater (for any process) consists of an induction coil (or electromagnet), through which a high-frequency alternating current (AC) is passed. Heat may also be generated by magnetic hysteresis losses in materials that have significant relative permeability. The frequency of AC used depends on the object size, material type, coupling (between the work coil and the object to be heated) and the penetration depth.High Frequency Induction heating is a process which is used to bond, harden or soften metals or other conductive materials. For many modern manufacturing processes, induction heating offers an attractive combination of speed, consistency and control. What's Induction Heating Applications Induction heating is a rapid ,clean, non-polluting heating form which can be used to heat metals or change the conductive material’s properties. The coil itself does not get hot and the heating effect is under controlled. The solid state transistor technology has made induction heating much easier,cost-effective heating for applications including soldering andinduction brazing ,induction heat treating, induction melting,induction forging etc. https://dw-inductionheater.com/what-is-induction-heating.html?feed_id=231036&_unique_id=655b1486afe42

Induction Heating PDF

Induction Heating

•Works like a transformer (Step down transformer –low voltage and high current ) – electromagnetic induction principle

Induction Heating Advantages

• No contact is required between the work piece and the induction coil as the heat source • Heat is restricted to localized areas or surface zones immediately adjacent to the coil. • Alternating current (ac) in an induction coil has an invisible force field (electromagnetic, or flux) around it

Induction Heating Rate

•The rate of heating of the work piece is dependent on the : • Frequency of the induced current, • The intensity of the induced current, • The specific heat of the material (ability to absorb heat), • The magnetic permeability of the material, • The resistance of the material to the flow of current. induction_heating

What Is Induction Heating?

What Is Induction Heating? Induction heating is the process of heating an electrically conducting object (usually a metal) by electromagnetic induction, where eddy currents (also called Foucault currents) are generated within the metal and resistance leads to Joule heating of the metal.Induction heating is a form of non-contact heating,when alternating current flows in the induced coil, varying electromagnetic field is set up around the coil, circulating current(induced, current, eddy current) is generated in the workpiece(conductive material), heat is produced as the eddy current flows against the resitivity of the material.The basic principles of induction heating have been understood and applied to manufacturing since the 1920s. During World War II, the technology developed rapidly to meet urgent wartime requirements for a fast, reliable process to harden metal engine parts. More recently, the focus on lean manufacturing techniques and emphasis on improved quality control have led to a rediscovery of induction technology, along with the development of precisely controlled, all solid state induction power supplies. [caption id="attachment_143" align="alignright" width="500"] induction_heating_principle[/caption] How Induction Heating Work? An induction heater (for any process) consists of an induction coil (or electromagnet), through which a high-frequency alternating current (AC) is passed. Heat may also be generated by magnetic hysteresis losses in materials that have significant relative permeability. The frequency of AC used depends on the object size, material type, coupling (between the work coil and the object to be heated) and the penetration depth.High Frequency Induction heating is a process which is used to bond, harden or soften metals or other conductive materials. For many modern manufacturing processes, induction heating offers an attractive combination of speed, consistency and control. What's Induction Heating Applications Induction heating is a rapid ,clean, non-polluting heating form which can be used to heat metals or change the conductive material’s properties. The coil itself does not get hot and the heating effect is under controlled. The solid state transistor technology has made induction heating much easier,cost-effective heating for applications including soldering andinduction brazing ,induction heat treating, induction melting,induction forging etc.

Induction Heating Basic

Induction Heating Basics

Induction heating takes place in an electrically conducting object (not necessarily magnetic steel) when the object is placed in a varying magnetic field. Induction heating is due to the hysteresis and eddy-current losses. Induction heating is the process of heating an electrically conducting object (usually a metal) by electromagnetic induction, through heat generated in the object by eddy currents. An induction heater consists of an electromagnet and an electronic oscillator that passes a high-frequency alternating current (AC) through the electromagnet. The rapidly alternating magnetic field penetrates the object, generating electric currents inside the conductor, called eddy currents. The eddy currents flowing through the resistance of the material heat it by Joule heating. In ferromagnetic (and ferrimagnetic) materials like iron, heat may also be generated by magnetic hysteresis losses. The frequency of current used depends on the object size, material type, coupling (between the work coil and the object to be heated) and the penetration depth. Hysteresis losses only occur in magnetic materials such as steel, nickel, and very few others. Hysteresis loss states that this is caused by friction between molecules when the material is magnetized first in one direction, and then in the other. The molecules may be regarded as small magnets which turn around with each reversal of direction of the magnetic field. Work (energy) is required to turn them around. The energy converts into heat. The rate of expenditure of energy (power) increases with an increased rate of reversal (frequency). Eddy-current losses occur in any conducting material in a varying magnetic field. This causes heading, even if the materials do not have any of the magnetic properties usually associated with iron and steel. Examples are copper, brass, aluminum, zirconium, nonmagnetic stainless steel, and uranium. Eddy currents are electric currents inducted by transformer action in the material. As their name implies, they appear to flow around in swirls on eddies within a solid mass of material. Eddy-current losses are much more important than hysteresis losses in induction heating. Note that induction heating is applied to nonmagnetic materials, where no hysteresis losses occur. For the heating of steel for hardening, forging, melting, or any other purposes which require a temperature above Curie temperature, we cannot depend upon hysteresis. Steel loses its magnetic properties above this temperature. When steel is heated below the Curie point, the contribution of hysteresis is usually so small that it can be ignored. For all practical purposes, the I²R of the eddy currents is the only way in which electrical energy can be turned into heat for induction heating purposes. Two basic things for induction heating to occur:

• A changing magnetic field
• An electrically conductive material placed into the magnetic field

What Is Induction Heating?

What Is Induction Heating? Induction heating is the process of heating an electrically conducting object (usually a metal) by electromagnetic induction, where eddy currents (also called Foucault currents) are generated within the metal and resistance leads to Joule heating of the metal.Induction heating is a form of non-contact heating,when alternating current flows in the induced coil, varying electromagnetic field is set up around the coil, circulating current(induced, current, eddy current) is generated in the workpiece(conductive material), heat is produced as the eddy current flows against the resitivity of the material.The basic principles of induction heating have been understood and applied to manufacturing since the 1920s. During World War II, the technology developed rapidly to meet urgent wartime requirements for a fast, reliable process to harden metal engine parts. More recently, the focus on lean manufacturing techniques and emphasis on improved quality control have led to a rediscovery of induction technology, along with the development of precisely controlled, all solid state induction power supplies. [caption id="attachment_143" align="alignright" width="500"] induction_heating_principle[/caption] How Induction Heating Work? An induction heater (for any process) consists of an induction coil (or electromagnet), through which a high-frequency alternating current (AC) is passed. Heat may also be generated by magnetic hysteresis losses in materials that have significant relative permeability. The frequency of AC used depends on the object size, material type, coupling (between the work coil and the object to be heated) and the penetration depth.High Frequency Induction heating is a process which is used to bond, harden or soften metals or other conductive materials. For many modern manufacturing processes, induction heating offers an attractive combination of speed, consistency and control. What's Induction Heating Applications Induction heating is a rapid ,clean, non-polluting heating form which can be used to heat metals or change the conductive material’s properties. The coil itself does not get hot and the heating effect is under controlled. The solid state transistor technology has made induction heating much easier,cost-effective heating for applications including soldering andinduction brazing ,induction heat treating, induction melting,induction forging etc.

Induction Heating Basic

Induction Heating Basics

Induction heating takes place in an electrically conducting object (not necessarily magnetic steel) when the object is placed in a varying magnetic field. Induction heating is due to the hysteresis and eddy-current losses. Induction heating is the process of heating an electrically conducting object (usually a metal) by electromagnetic induction, through heat generated in the object by eddy currents. An induction heater consists of an electromagnet and an electronic oscillator that passes a high-frequency alternating current (AC) through the electromagnet. The rapidly alternating magnetic field penetrates the object, generating electric currents inside the conductor, called eddy currents. The eddy currents flowing through the resistance of the material heat it by Joule heating. In ferromagnetic (and ferrimagnetic) materials like iron, heat may also be generated by magnetic hysteresis losses. The frequency of current used depends on the object size, material type, coupling (between the work coil and the object to be heated) and the penetration depth. Hysteresis losses only occur in magnetic materials such as steel, nickel, and very few others. Hysteresis loss states that this is caused by friction between molecules when the material is magnetized first in one direction, and then in the other. The molecules may be regarded as small magnets which turn around with each reversal of direction of the magnetic field. Work (energy) is required to turn them around. The energy converts into heat. The rate of expenditure of energy (power) increases with an increased rate of reversal (frequency). Eddy-current losses occur in any conducting material in a varying magnetic field. This causes heading, even if the materials do not have any of the magnetic properties usually associated with iron and steel. Examples are copper, brass, aluminum, zirconium, nonmagnetic stainless steel, and uranium. Eddy currents are electric currents inducted by transformer action in the material. As their name implies, they appear to flow around in swirls on eddies within a solid mass of material. Eddy-current losses are much more important than hysteresis losses in induction heating. Note that induction heating is applied to nonmagnetic materials, where no hysteresis losses occur. For the heating of steel for hardening, forging, melting, or any other purposes which require a temperature above Curie temperature, we cannot depend upon hysteresis. Steel loses its magnetic properties above this temperature. When steel is heated below the Curie point, the contribution of hysteresis is usually so small that it can be ignored. For all practical purposes, the I²R of the eddy currents is the only way in which electrical energy can be turned into heat for induction heating purposes. Two basic things for induction heating to occur:

• A changing magnetic field
• An electrically conductive material placed into the magnetic field

https://dw-inductionheater.com/high-frequency-induction-heating-basic.html?feed_id=224686&_unique_id=64e7606caf8ee

Induction Heating Basic

Induction Heating Basics

Induction heating takes place in an electrically conducting object (not necessarily magnetic steel) when the object is placed in a varying magnetic field. Induction heating is due to the hysteresis and eddy-current losses. Induction heating is the process of heating an electrically conducting object (usually a metal) by electromagnetic induction, through heat generated in the object by eddy currents. An induction heater consists of an electromagnet and an electronic oscillator that passes a high-frequency alternating current (AC) through the electromagnet. The rapidly alternating magnetic field penetrates the object, generating electric currents inside the conductor, called eddy currents. The eddy currents flowing through the resistance of the material heat it by Joule heating. In ferromagnetic (and ferrimagnetic) materials like iron, heat may also be generated by magnetic hysteresis losses. The frequency of current used depends on the object size, material type, coupling (between the work coil and the object to be heated) and the penetration depth. Hysteresis losses only occur in magnetic materials such as steel, nickel, and very few others. Hysteresis loss states that this is caused by friction between molecules when the material is magnetized first in one direction, and then in the other. The molecules may be regarded as small magnets which turn around with each reversal of direction of the magnetic field. Work (energy) is required to turn them around. The energy converts into heat. The rate of expenditure of energy (power) increases with an increased rate of reversal (frequency). Eddy-current losses occur in any conducting material in a varying magnetic field. This causes heading, even if the materials do not have any of the magnetic properties usually associated with iron and steel. Examples are copper, brass, aluminum, zirconium, nonmagnetic stainless steel, and uranium. Eddy currents are electric currents inducted by transformer action in the material. As their name implies, they appear to flow around in swirls on eddies within a solid mass of material. Eddy-current losses are much more important than hysteresis losses in induction heating. Note that induction heating is applied to nonmagnetic materials, where no hysteresis losses occur. For the heating of steel for hardening, forging, melting, or any other purposes which require a temperature above Curie temperature, we cannot depend upon hysteresis. Steel loses its magnetic properties above this temperature. When steel is heated below the Curie point, the contribution of hysteresis is usually so small that it can be ignored. For all practical purposes, the I²R of the eddy currents is the only way in which electrical energy can be turned into heat for induction heating purposes. Two basic things for induction heating to occur:

• A changing magnetic field
• An electrically conductive material placed into the magnetic field

Induction Heating Basic

Induction Heating Basics

Induction heating takes place in an electrically conducting object (not necessarily magnetic steel) when the object is placed in a varying magnetic field. Induction heating is due to the hysteresis and eddy-current losses. Induction heating is the process of heating an electrically conducting object (usually a metal) by electromagnetic induction, through heat generated in the object by eddy currents. An induction heater consists of an electromagnet and an electronic oscillator that passes a high-frequency alternating current (AC) through the electromagnet. The rapidly alternating magnetic field penetrates the object, generating electric currents inside the conductor, called eddy currents. The eddy currents flowing through the resistance of the material heat it by Joule heating. In ferromagnetic (and ferrimagnetic) materials like iron, heat may also be generated by magnetic hysteresis losses. The frequency of current used depends on the object size, material type, coupling (between the work coil and the object to be heated) and the penetration depth. Hysteresis losses only occur in magnetic materials such as steel, nickel, and very few others. Hysteresis loss states that this is caused by friction between molecules when the material is magnetized first in one direction, and then in the other. The molecules may be regarded as small magnets which turn around with each reversal of direction of the magnetic field. Work (energy) is required to turn them around. The energy converts into heat. The rate of expenditure of energy (power) increases with an increased rate of reversal (frequency). Eddy-current losses occur in any conducting material in a varying magnetic field. This causes heading, even if the materials do not have any of the magnetic properties usually associated with iron and steel. Examples are copper, brass, aluminum, zirconium, nonmagnetic stainless steel, and uranium. Eddy currents are electric currents inducted by transformer action in the material. As their name implies, they appear to flow around in swirls on eddies within a solid mass of material. Eddy-current losses are much more important than hysteresis losses in induction heating. Note that induction heating is applied to nonmagnetic materials, where no hysteresis losses occur. For the heating of steel for hardening, forging, melting, or any other purposes which require a temperature above Curie temperature, we cannot depend upon hysteresis. Steel loses its magnetic properties above this temperature. When steel is heated below the Curie point, the contribution of hysteresis is usually so small that it can be ignored. For all practical purposes, the I²R of the eddy currents is the only way in which electrical energy can be turned into heat for induction heating purposes. Two basic things for induction heating to occur:

• A changing magnetic field
• An electrically conductive material placed into the magnetic field

What Is Induction Heating?

What Is Induction Heating? Induction heating is the process of heating an electrically conducting object (usually a metal) by electromagnetic induction, where eddy currents (also called Foucault currents) are generated within the metal and resistance leads to Joule heating of the metal.Induction heating is a form of non-contact heating,when alternating current flows in the induced coil, varying electromagnetic field is set up around the coil, circulating current(induced, current, eddy current) is generated in the workpiece(conductive material), heat is produced as the eddy current flows against the resitivity of the material.The basic principles of induction heating have been understood and applied to manufacturing since the 1920s. During World War II, the technology developed rapidly to meet urgent wartime requirements for a fast, reliable process to harden metal engine parts. More recently, the focus on lean manufacturing techniques and emphasis on improved quality control have led to a rediscovery of induction technology, along with the development of precisely controlled, all solid state induction power supplies. [caption id="attachment_143" align="alignright" width="500"] induction_heating_principle[/caption] How Induction Heating Work? An induction heater (for any process) consists of an induction coil (or electromagnet), through which a high-frequency alternating current (AC) is passed. Heat may also be generated by magnetic hysteresis losses in materials that have significant relative permeability. The frequency of AC used depends on the object size, material type, coupling (between the work coil and the object to be heated) and the penetration depth.High Frequency Induction heating is a process which is used to bond, harden or soften metals or other conductive materials. For many modern manufacturing processes, induction heating offers an attractive combination of speed, consistency and control. What's Induction Heating Applications Induction heating is a rapid ,clean, non-polluting heating form which can be used to heat metals or change the conductive material’s properties. The coil itself does not get hot and the heating effect is under controlled. The solid state transistor technology has made induction heating much easier,cost-effective heating for applications including soldering andinduction brazing ,induction heat treating, induction melting,induction forging etc.

Induction Heating PDF

Induction Heating

•Works like a transformer (Step down transformer –low voltage and high current ) – electromagnetic induction principle

Induction Heating Advantages

• No contact is required between the work piece and the induction coil as the heat source • Heat is restricted to localized areas or surface zones immediately adjacent to the coil. • Alternating current (ac) in an induction coil has an invisible force field (electromagnetic, or flux) around it

Induction Heating Rate

•The rate of heating of the work piece is dependent on the : • Frequency of the induced current, • The intensity of the induced current, • The specific heat of the material (ability to absorb heat), • The magnetic permeability of the material, • The resistance of the material to the flow of current. induction_heating

Induction Heating PDF

Induction Heating

•Works like a transformer (Step down transformer –low voltage and high current ) – electromagnetic induction principle

Induction Heating Advantages

• No contact is required between the work piece and the induction coil as the heat source • Heat is restricted to localized areas or surface zones immediately adjacent to the coil. • Alternating current (ac) in an induction coil has an invisible force field (electromagnetic, or flux) around it

Induction Heating Rate

•The rate of heating of the work piece is dependent on the : • Frequency of the induced current, • The intensity of the induced current, • The specific heat of the material (ability to absorb heat), • The magnetic permeability of the material, • The resistance of the material to the flow of current. induction_heating https://dw-inductionheater.com/induction-heating-pdf.html?feed_id=213661&_unique_id=648c93249ff16

Induction Heating PDF

Induction Heating

•Works like a transformer (Step down transformer –low voltage and high current ) – electromagnetic induction principle

Induction Heating Advantages

• No contact is required between the work piece and the induction coil as the heat source • Heat is restricted to localized areas or surface zones immediately adjacent to the coil. • Alternating current (ac) in an induction coil has an invisible force field (electromagnetic, or flux) around it

Induction Heating Rate

•The rate of heating of the work piece is dependent on the : • Frequency of the induced current, • The intensity of the induced current, • The specific heat of the material (ability to absorb heat), • The magnetic permeability of the material, • The resistance of the material to the flow of current. induction_heating

Induction Heating Basic

Induction Heating Basics

Induction heating takes place in an electrically conducting object (not necessarily magnetic steel) when the object is placed in a varying magnetic field. Induction heating is due to the hysteresis and eddy-current losses. Induction heating is the process of heating an electrically conducting object (usually a metal) by electromagnetic induction, through heat generated in the object by eddy currents. An induction heater consists of an electromagnet and an electronic oscillator that passes a high-frequency alternating current (AC) through the electromagnet. The rapidly alternating magnetic field penetrates the object, generating electric currents inside the conductor, called eddy currents. The eddy currents flowing through the resistance of the material heat it by Joule heating. In ferromagnetic (and ferrimagnetic) materials like iron, heat may also be generated by magnetic hysteresis losses. The frequency of current used depends on the object size, material type, coupling (between the work coil and the object to be heated) and the penetration depth. Hysteresis losses only occur in magnetic materials such as steel, nickel, and very few others. Hysteresis loss states that this is caused by friction between molecules when the material is magnetized first in one direction, and then in the other. The molecules may be regarded as small magnets which turn around with each reversal of direction of the magnetic field. Work (energy) is required to turn them around. The energy converts into heat. The rate of expenditure of energy (power) increases with an increased rate of reversal (frequency). Eddy-current losses occur in any conducting material in a varying magnetic field. This causes heading, even if the materials do not have any of the magnetic properties usually associated with iron and steel. Examples are copper, brass, aluminum, zirconium, nonmagnetic stainless steel, and uranium. Eddy currents are electric currents inducted by transformer action in the material. As their name implies, they appear to flow around in swirls on eddies within a solid mass of material. Eddy-current losses are much more important than hysteresis losses in induction heating. Note that induction heating is applied to nonmagnetic materials, where no hysteresis losses occur. For the heating of steel for hardening, forging, melting, or any other purposes which require a temperature above Curie temperature, we cannot depend upon hysteresis. Steel loses its magnetic properties above this temperature. When steel is heated below the Curie point, the contribution of hysteresis is usually so small that it can be ignored. For all practical purposes, the I²R of the eddy currents is the only way in which electrical energy can be turned into heat for induction heating purposes. Two basic things for induction heating to occur:

• A changing magnetic field
• An electrically conductive material placed into the magnetic field

Induction Heating PDF

Induction Heating

•Works like a transformer (Step down transformer –low voltage and high current ) – electromagnetic induction principle

Induction Heating Advantages

• No contact is required between the work piece and the induction coil as the heat source • Heat is restricted to localized areas or surface zones immediately adjacent to the coil. • Alternating current (ac) in an induction coil has an invisible force field (electromagnetic, or flux) around it

Induction Heating Rate

•The rate of heating of the work piece is dependent on the : • Frequency of the induced current, • The intensity of the induced current, • The specific heat of the material (ability to absorb heat), • The magnetic permeability of the material, • The resistance of the material to the flow of current. induction_heating

What Is Induction Heating?

What Is Induction Heating? Induction heating is the process of heating an electrically conducting object (usually a metal) by electromagnetic induction, where eddy currents (also called Foucault currents) are generated within the metal and resistance leads to Joule heating of the metal.Induction heating is a form of non-contact heating,when alternating current flows in the induced coil, varying electromagnetic field is set up around the coil, circulating current(induced, current, eddy current) is generated in the workpiece(conductive material), heat is produced as the eddy current flows against the resitivity of the material.The basic principles of induction heating have been understood and applied to manufacturing since the 1920s. During World War II, the technology developed rapidly to meet urgent wartime requirements for a fast, reliable process to harden metal engine parts. More recently, the focus on lean manufacturing techniques and emphasis on improved quality control have led to a rediscovery of induction technology, along with the development of precisely controlled, all solid state induction power supplies. [caption id="attachment_143" align="alignright" width="500"] induction_heating_principle[/caption] How Induction Heating Work? An induction heater (for any process) consists of an induction coil (or electromagnet), through which a high-frequency alternating current (AC) is passed. Heat may also be generated by magnetic hysteresis losses in materials that have significant relative permeability. The frequency of AC used depends on the object size, material type, coupling (between the work coil and the object to be heated) and the penetration depth.High Frequency Induction heating is a process which is used to bond, harden or soften metals or other conductive materials. For many modern manufacturing processes, induction heating offers an attractive combination of speed, consistency and control. What's Induction Heating Applications Induction heating is a rapid ,clean, non-polluting heating form which can be used to heat metals or change the conductive material’s properties. The coil itself does not get hot and the heating effect is under controlled. The solid state transistor technology has made induction heating much easier,cost-effective heating for applications including soldering andinduction brazing ,induction heat treating, induction melting,induction forging etc.

Induction Heating PDF

Induction Heating

•Works like a transformer (Step down transformer –low voltage and high current ) – electromagnetic induction principle

Induction Heating Advantages

• No contact is required between the work piece and the induction coil as the heat source • Heat is restricted to localized areas or surface zones immediately adjacent to the coil. • Alternating current (ac) in an induction coil has an invisible force field (electromagnetic, or flux) around it

Induction Heating Rate

•The rate of heating of the work piece is dependent on the : • Frequency of the induced current, • The intensity of the induced current, • The specific heat of the material (ability to absorb heat), • The magnetic permeability of the material, • The resistance of the material to the flow of current. induction_heating

Induction Heating PDF

Induction Heating

•Works like a transformer (Step down transformer –low voltage and high current )
– electromagnetic induction principle

Induction Heating Advantages

• No contact is required between the work piece and the induction coil as the heat source
• Heat is restricted to localized areas or surface zones immediately adjacent to the coil.
• Alternating current (ac) in an induction coil has an invisible force field (electromagnetic, or flux) around it

Induction Heating Rate

•The rate of heating of the work piece is dependent on the :
• Frequency of the induced current,
• The intensity of the induced current,
• The specific heat of the material (ability to absorb heat),
• The magnetic permeability of the material,
• The resistance of the material to the flow of current.





induction_heating