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Why induction heating ? 
Induction heating is a subfield of industrially used electric heating. All electrically - conductive materials can be heated quickly and cleanly with pollution free induction heating. Features include :
- Selected parts of the workpiece can be heated.
- Heating time and temperature can be precisely controlled.
- There is no smoke or soot pollution;
- Heating operation can be integrated in semi - automatic production sequences;
- Induction equipment can usually be operated by unskilled personal
Key advantages of induction heating
- Very fast partial hardening;
- High production rates;
- Significant reduction in pollution, distortion, forging scale, energy and space requirements;
- High degree of reproduction and automation;
What is induction heating ?
Placing a metal body in an alternating magnetic field creates eddy currents, causing losses through which the metal is heated.
Skin effects concentrate these currents in the outer layers. The inductor traversed by an alternating current creates a magnetic field, which should be optimally adapted to the workpiece.
The depth of heating can be influenced by varying the AC frequency, but it also depends on the concentration of flux capacity, on the length of treatment and the material of the workpiece, i.e. its heat - conduction properties.
Medium frequency is usually used for melting , forging heat treatment and annealing. For hardening and soldering, medium or high frequency may be used, depending on the treatment required.
Major uses of induction heat treatment
Melting ferrous and non - ferrous metals with temperatures up to 18000c.
- Heating for forging up to 12500c.
- Stress relieving and normalising steels after cold forming between 7500c and 9500c.
- Surface hardening of steel or cast iron workpieces at 8500c to 9500c.
- Soft soldering and brazing up to 11000c.
- Recrystallisation.
- Tube and Pipe Welding.
Tube Welding Process In the HFI (High Frequency Induction) tube welding process, high frequency current at approximately 400 kHz is induced in the open seam tube, an induction coil located ahead of (upstream from) the weld point, as shown in the picture.
The coil acts as the primary of a high frequency (HF) transformer, and the open seam tube acts as one-turn secondary. As in general induction heating application, the induced current path in the work piece (formed strip) tends to confirm to the shape of the induction coil. Most of the induced current completes its path around the end (apex) of the Vee-shaped opening in the strip.
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