... handheld induction heater is usually usde for metal brazing, forging, casting, tempering, heating and ect. Application of handheld induction heater:A. ... . Detail applications are stated as follows: 1. Quench for various hardware and tools, such as plier, wrench, hammer ... ax, screwing tools and shear (orchard shear).2.Quench for various automobile and motorcycle fittings, such as crankshaft, connecting ...