in induction melting furnace using induction heating of a conductive medium (usually a metal) in a crucible around which water-cooled magnetic coils are wound, metals are melted. in induction furnace the melting process is well controlled. the whole process is

coreless and channel furnaces are the two most common induction melting furnace designs that are commonly used.

buying tips before purchasing induction melting furnace you should bear following things in mind. firstly you should be clear that for what purpose you are selecting the furnace. the size and width should depend on the area of its installation and the volume of work. for homogeneous melting there should be stirrer must you must ensure whether your furnace posses that feature or not.

coreless furnace
metals are contained in the coreless furnace by the use of refractory envelope and surround that by the coil. induction melting furnace operates on the same basis as a transformer. acting as a single secondary turn the charge produce heat through eddy current flow when power is applied to the multi turn primary coil. after the melting of the metal these electromagnetic forces also produce a stirring action. through careful selection of frequency and power mixing and melting rates can be controlled.

channel furnace
induction channel furnaces are popular induction melting furnace which were used initially as molten metal holders, but are now used for some melting applications as well. it consists of an inductor which is the source of energy and is comprised of a water-cooled coil. for holding metal at temperature, channel induction furnaces are often selected

it is the refractory where the channel is formed through the coil, and this channel forms a continuous loop with the metal in the main part of the furnace. the hot metal in the channel is replaced by the cold metals. the hot metal circulates into the main body of the metal in the furnace envelope. source of primary molten metal is required for the startup of a channel furnace. these furnaces do have lower surface turbulence within the main metal bath. in any operations where gas pickup and volatile metal alloy loss is a problem coreless furnace are preferred.

coreless frequencies are of following frequencies like:

did you know? induction heating process is a method in which the electrical conducting material is heated through by eddy currents induced by a varying electromagnetic field. the principle of the induction heating process is similar to that of a transformer.

• line frequency (60 hertz)
• medium frequency (200 hertz)
• high frequency (over 1,200 hertz).

line frequency furnaces are slower to start from a cold charge resulting in growing preference for medium and high frequency units. improvements in frequency converters and lower costs have also aided acceptance.

advantages
following are the advantages of induction melting furnace:

• the melting furnace gives higher yield.
• it starts up instantaneously thereby reducing the time to reach working temperature.
• it is highly flexible no molten metal is necessary to start medium frequency coreless induction melting equipment.
• the natural stirring helps in the uniform melting.
• melting is cleaner.
• they can be installed even in the small place. small furnace can provide high melting rate.
• the small size with respect to melting rate results in the requirement of much less refractory than fuel-fired units.
• it is energy efficient.

applications
induction melting furnace are used for various purposes:

• refining of high purity metal and alloys
• electrodes for remelting
• casting of various engines
• foundries
• brazing
• iron and steel industry
• aluminum industry etc.

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