Induction heating is a versatile process that can be tailored to various applications and workpiece sizes. The frequency used for induction heating depends on the specific needs of the application and the type of workpiece being heated. Here are the main frequency ranges used in different types of induction heating:
What Frequency is Used for Induction Heating? 5 Key Ranges Explained
1. High-Frequency Induction Heating
High-frequency induction heating typically operates at frequencies between 100 to 500 kHz.
This type of heating is ideal for small to medium-sized parts that require a thin hardened layer.
Examples include small module gears and medium-sized shafts.
The effective hardening depth is relatively shallow, ranging from 0.5 to 2 mm.
2. Medium Frequency Induction Heating
Medium-frequency induction heating operates in the range of 1 kHz to 10 kHz.
This method is suitable for larger workpieces and deeper heat treatments.
It is commonly used for large tempering, quenching, and heating of large diameter thick wall pipes and large workpieces.
Medium-frequency heating is also used in hot forging, smelting, and quenching processes where deeper heat penetration is needed.
3. Super Audio Frequency Induction Heating
Super audio frequency induction heating operates at frequencies between 150 to 8000 Hz.
This category is often referred to as medium frequency as well.
It is used in electric induction furnaces for various applications including melting, quenching, and tempering.
The term "super audio frequency" is somewhat ambiguous and overlaps with the lower end of the medium frequency range.
4. Utility Frequency Induction Heating
Utility frequency induction heating uses the standard electrical grid frequency, which is 50/60 Hz.
This method is used for lower-cost industrial applications where inverters are not required.
It can be effective for certain types of heating processes that do not require high frequencies.
5. Induction Furnace Frequencies
Induction furnaces used for melting metals typically operate between 50 to 400 kHz.
The frequency can be adjusted based on the melting speed, type of material, and the volume of the furnace.
Higher frequencies are often used for smaller volumes of melts, while lower frequencies provide deeper penetration into the metal.
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