What is the difference between electromagnetic induction heating and high-frequency electromagnetic heating? In fact, both devices are electromagnetic heaters and use electromagnetic heating technology. The difference lies in the frequency magnitude. Let's learn about it together below!
Electromagnetic induction heating technology is currently mainly divided into 5 frequencies: low frequency, medium frequency, super audio frequency, high frequency, and ultra-high frequency.
1. Low-frequency induction heating method: The lowest frequency, with a frequency range from power frequency (50HZ) to about 1KHZ, commonly used at power frequency. The heating depth is the deepest, with the largest heating thickness, about 10-20mm. It is mainly used for overall heating, annealing, tempering, and surface hardening of large workpieces.
2. Medium-frequency induction heating method: Frequency range generally from about 1KHZ to 20KHZ, with a typical value around 8KHZ. Heating depth and thickness are about 3-10mm. It is mostly used for heating, annealing, tempering, quenching and tempering, and surface hardening of larger workpieces such as large-diameter shafts, large-diameter thick-walled pipes, large-module gears, as well as red punching and forging of smaller-diameter bars.
3. Super audio frequency induction heating method: Frequency range generally from about 20KHZ to 40KHZ (since audio frequency is 20HZ to 20KHZ, it is called super audio frequency). Heating depth and thickness are about 2-3mm. It is mostly used for deep heating, annealing, tempering, and quenching and tempering of medium-diameter workpieces, heating, welding, and thermal assembly of larger-diameter thin-walled pipes, and quenching of medium gears.
4. High-frequency induction heating method: Frequency range generally from about 40KHZ to 200KHZ, commonly 40KHZ to 80KHZ. Heating depth and thickness are about 1-2mm. It is mostly used for deep heating, red punching, forging, annealing, tempering, quenching and tempering, surface hardening of small workpieces, heating and welding of medium-diameter pipes, thermal assembly, and quenching of small gears.
5. Ultra-high frequency induction heating method: The highest frequency, with a frequency range generally above 200KHZ, up to tens of MHZ. The heating depth and thickness are the smallest, about 0.1-1mm. It is mostly used for quenching and welding of extremely small local parts or very thin bars, and surface hardening of small workpieces. Due to the skin effect when alternating current flows in a conductor, as the current frequency increases, the current tends to flow on the surface of the conductor.
