... Frequency range wide, dynamic adaptive range wide; 3. Induction loop working stable from a single ring to multiple ... structure, fewer parts, high reliability.Main applications:Heat treatment: Hardening, annealing, tempering of auto parts, motorcycles, hardware tools, ... welding of turning/woodworking tools, drill bits, serrated blade, steel, copper wall, similar metal.melting of metal smelting: (Vacuum ...