Electric arc furnace uses electric arc generated by electrified electrode to melt metal and ore, while induction furnace uses electrified induction coil to heat and melt metal .
How does an induction furnace work?
An induction furnace consists of a nonconductive crucible holding the charge of metal to be melted , surrounded by a coil of copper wire. A powerful alternating current flows through the wire. ... The magnetic field induces eddy currents, circular electric currents, inside the metal, by electromagnetic induction.
What are the two types of induction furnace?
There are two main types of induction furnace: coreless and channel .
How does an induction furnace melt?
An Induction melting furnace uses a copper induction heating coil that delivers an alternating magnetic current to the metal within the coil . This alternating magnetic current creates a resistance in the metal, causing it to heat and eventually to melt.
Which of the following are the advantages of an induction furnace?
Which of the following is/are the advantage(s) of an Induction Furnace? Explanation: Advantages offered by Induction Furnace are higher yield, faster startup, cleaner melting, natural stirring and compact installation .
Which is the main drawback of induction furnace in refining of steel?
The one major drawback to induction furnace usage in a foundry is the lack of refining capacity : charge materials must be free of oxides and be of a known composition, and some alloying elements may be lost due to oxidation, so they must be re-added to the melt.
What are the advantages and disadvantages of electric arc furnace?
The arc furnace tends to be larger and more powerful ; Less investment, quick to construct and fast cost recovery; The temperature and the component of the molten steel can be controlled with accuracy. The arc furnace can also smelt various kinds of different steels.
How efficient are induction heaters?
The U.S. Department of Energy (DOE) has estimated electric coil efficiency as about 74-77% and induction at 84% . Utility studies have shown similar results of about 80-81% efficiency for induction.
How much power does an induction furnace use?
A modern coreless induction furnace can melt a tonne of iron and raise the temperature of the liquid metal to 1450 °C using less than 600 kWh of electricity. Typically, specific energy consumption of coreless induction furnace varies from 500 to 800 kWh per tonne depending on type and grade of casting.
What can be the advantages of induction furnace over conventional furnaces?
The induction metal furnaces are cleaner with greater control over emissions and their release to the environment . You can focus more on the foundry process with less waste generated. Additionally, the forges are less noisy compared to their open-hearth counterparts.
Which current is induced in the induction furnace?
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.
How hot can an induction furnace get?
Induction furnaces do not have a limit to the temperature they can melt and/or heat . However, the refractories and materials that contain the heated or melted material have limitations. The highest temperature typically reached in open air is about 3300°F for a platinum melt.
What are the advantages of using induction furnace rather than cupola?
Besides, cupolas emit many pollutants, specifically dust, making induction a cleaner and safer way to melt cast iron . Another thing is that induction furnaces do not require an arc or combustion, making the temperature safer to work with.
What is the name of furnace to obtain cast iron?
A cupola or cupola furnace is a melting device used in foundries that can be used to melt cast iron, Ni-resist iron and some bronzes.
How is melt rate calculated in induction furnace?
You must specify the liquid metal requirement in tons or in Kgs, per month with working hours in a day. Suppose you required 1200 Tons / Month of M.S. ... 2 tons 1 hr divided by 0.8. is 2.0 ÷ 0.8 = 2.5 Tons / Hour should be the required furnace melt rate at 1600oC .
What is the function of yoke in induction furnace?
The yokes are used as strong components that prevent the Lorentz force generated by the coil from damaging and deforming it . The magnetic yokes also reduce the leakage flux that flows out of the appliance, preventing unintended heating in surrounding structures.
What is medium frequency induction furnace?
medium frequency induction furnaces are mainly used for metal smelting , roughing of mechanical parts and part-heating treatment processes.
How many types of electric furnaces are there?
There are three types of electrical furnaces namely: (1) Induction Heating Furnace (2) Resistance Heating Furnace and (3) Arc furnace depending upon the method of heat generation.
How many types of electric arc furnace are there?
The arc furnaces are used to produce mini steel structural bars and steel rods. The electric furnace is in form of a vertical vessel of fire brick. There are mainly two types of electric furnaces. They are alternating current (AC) and direct current (DC) operated electric furnaces.
Which is disadvantage of electric arc furnace process?
Disadvantages: The quality of molten steel is greatly affected by scrap steel , the smelting period is longer, and the power consumption is larger. According to the above, the electric arc furnace uses scrap steel as the main raw material.
Does induction heating use less electricity?
An induction cooktop does not use more electricity and is far more energy-efficient than gas or electric cooktops. ... In comparison, with a gas stove or electric cooktops, only 65-70% of the heat is used for actual cooking. This makes induction cooking a lot more energy-efficient.
Does induction heating work on aluminum?
Induction heating is a precise, repeatable, non-contact method for heating electrically-conductive materials like brass, aluminum, copper or steel or semiconducting materials like silicon carbide. ... Induction heating is used very effectively in many processes like brazing, soldering and shrink fitting.
What metals can be induction heated?
- Copper and copper alloys.
- Brass.
- Aluminum.
- Iron.
- Steel and stainless steel.
- Tungsten.
- Chrome.
- Nickel and nickel alloys.
How can I reduce the power consumption of my induction furnace?
Another way to reduce energy consumption in the furnace is to pour at the coolest temperature that is practical and avoid temperature overshooting . For example, if metal that could have been poured at 2,750°F is allowed to rise less than 10% to 3,000°F, heat losses are boosted by 33%, using significantly more energy.
Which supply used for coreless induction heating furnace?
The coreless induction furnace can best be described as a refractory-lined vessel with an electrically energized/current-carrying, water-cooled copper coil surrounding it . Electrical current in the coil forms an electromagnetic field, which generates enough thermal energy to melt the charge.
Is induction heating more efficient than resistive heating?
With resistive technology, heat is created from the heater coil, then conducted to the tip. Resis- tive heating has higher thermal resistance and therefore offers lower thermal performance than inductive heating.
Can a cupola melt steel?
Cupola furnaces burn coke with an air blast to melt scrap steel , cast iron, and alloys into a consistent grade of iron. ... It may result in iron that is sub-standard in quality, and thus inferior cast products, or scrapped metal, or do-over costs, or remediation.
What are the disadvantages of cupola furnace?
Disadvantages of Cupola Furnace
The main disadvantage is that sometimes it is very hard to control the temperature in this furnace . Metal elements are converted to their oxide, which is not suitable for casting.
Can you build an induction furnace?
If you’ve ever wanted to forge, cast, or smelt metal, this project is right up your alley. It gets hot enough to melt and forge steel, iron, and aluminum. ... An induction heater operates by surrounding the object to be heated with a coil carrying high frequency AC current.
Where induction furnace is used?
These furnaces are used in steel and iron mills , but can also be used for nonferrous metals. Medium-frequency graphite crucible induction furnaces are typically used to cast precious metals. The crucible and the inductor can also be placed in a vacuum chamber for custom casting applications.
What is steel induction furnace?
Induction furnace is a type of furnace for steelmaking which uses electrical energy for its operation . ... The principle of melting in IF is that a high voltage electrical source from a primary coil induces a low voltage, high current in the metal or secondary coil.
Who invented induction heating?
The basic principle involved in induction heating was discovered by Michael Faraday as early as 1831. Faraday’s work involved the use of a switched DC supply provided by a battery and two windings of copper wire wrapped around an iron core.
Will an induction heater work on stainless steel?
Stainless steel pans will work on an induction cooking surface if the base of the pan is a magnetic grade of stainless steel . If a magnet sticks well to the sole of the pan, it will work on an induction cooking surface. An “all-metal” cooker will work with non-ferrous cookware, but available models are limited.
Does induction heating work on brass?
Induction heating is an accurate, fast, repeatable, efficient, non-contact technique for heating metals or any other electrically-conductive materials. ... The material used to make the work piece can be a metal such as copper, aluminum, steel, or brass.
Does brass work on induction?
Have a nice dish!!!!!! Some non-induction cookware (for example, utensils made of steel, copper, brass or earthenware/ceramicware that have metal base) do get heated.
