... oscillate frequency 30-80KHZ 4.SIMMENS IGBT Induction Heater for Metal 40KW.1.perfect functions of protect itself.2. ... work pieces. Detail applications are stated as follows:1. Quenching for various hardware and tools, such as plier, wrench, hammer, ... ax, screwing tools and shear (orchard shear).2. Quenching for various automobile and motorcycle fittings, such as crankshaft, connecting rod ...