How does vacuum induction melting work?

The vacuum induction melting (VIM) process involves the melting of metals by electromagnetic induction under vacuum. The process involves the refining of metals and alloys under vacuum for the removal of dissolved and chemical-bonded impurities, resulting in an end product that is clean and homogeneous.

What is the purpose of the vacuum melting point?

Melting in vacuum can avoid oxidization and also further purify the metals. Gases that initially exist in the starting materials and trace impurities such as Mg, S, Mn, and Ca volatilize in the vacuum melting process.

What is vacuum melt steel?

Vacuum induction melting (VIM) utilizes electric currents to melt metal within a vacuum. The first prototype was developed in 1920. Induction heating induces eddy currents within conductors. Eddy currents create heating effects to melt the metal.

How does an induction melting furnace work?

In the induction furnace, a coil carrying alternating electric current surrounds the container or chamber of metal. Eddy currents are induced in the metal (charge), the circulation of these currents producing extremely high temperatures for melting the metals and for making alloys of exact composition.

What is VIM VAR?

Core Iron (VIM VAR) is a low carbon magnetic iron produced using vacuum induction melting plus vacuum arc re-melting practices. Other elements commonly found in low carbon irons are held as low as possible to ensure good DC magnetic properties.

Does vacuum lower melting point?

For most other substances (where the solid is more dense than the liquid) the effect is in the reverse direction (so that vacuum will lower the melting point), but the effect is still small, at least for the small pressure difference between atmospheric and vacuum.

Does melting point change in a vacuum?

The melting point of a solid is very little affected by variation of pressure whether increased or decreased. Most polymers are solids so there is no need to worry; the recorded melting point is accepted under low vacuum (there will be no significant change from the normal melting point).

How does arc melting work?

2.4 Electric Arc Melting This type of melting furnace works by the application of alternating current to the electrode, which is arranged so as to generate an arc discharged inside the furnace. The heat produced by arcing causes the residues on the metal base to melt.

What is induction furnace PDF?

ELECTRIC INDUCTION FURNACE The electric induction furnace is a type of melting furnace that uses electric currents to melt metal. Induction furnaces are ideal for melting and alloying a wide variety of metals with minimum melt losses, however, little refining of the metal is possible.

Which induction is the principle of induction furnace?

Electromagnetic induction
The principle of induction furnace is the Induction heating: Induction heating is a form of non-contact heating for conductive materials. The principle of induction heating is mainly based on two well-known physical phenomena: Electromagnetic induction.

What is 316L VAR?

316L austenitic stainless steel is a low carbon version of 316 and is melted as AOD, AOD + VAR, or VIM + VAR melt type. The low carbon helps improve weldability as compared to the 316 as well as improved corrosion resistance.

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