FIELD: welding and cutting of ferromagnetic materials, heating of other materials through a contact with ferromagnetic layer. SUBSTANCE: induction heater is made in the form of a coil wound on a toroid-shaped frame, whose cross-section is variable and decreases to the gap made on the frame. This section of the induction heater is intended for production of local heating, for example, in the area of welding. The induction heater has some more specific features that allow field concentration in the area of heating. EFFECT: enhanced efficiency. 2 cl, 3 dwg
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