... the heating based on the principle of hot expansion or hot smelting, for instances, embedded welding of copper core of computer radiator ... hammer, ax, screwing tools and shear (orchard shear).2. Quenching for various automobile and motorcycle fittings, such as crankshaft, connecting rod ... , such as shaft, gear (chain wheel), cam, chuck and clamp etc.6. Quench for hardware molds, such as small-size mold ...