... heating, insulating power and time, will help providehigh quality of the repetitive heating and simplify workers to ... , drive axle, small crank shaft pins, rocker, and other accessories high frequency hardening machine.hardware tools high-frequency hardening heat ... , silver, gold, and aluminium materials, etc. 2. Melting capacity can be from 3KG to 300KG. IGBT high frequency cooper melting machine