... . ISO9001:2001/CE etc 3. 37KW, 380V,30-80KHZ 4. Metal superficial heating is perfect This high frequency induction heating machine A. Heating (hot forging, ... to the connection of different metals or metals with nonmetals through the heating based on the principle of hot expansion ... of various other metal work pieces, such as golf ball head, cue, brass lock, hardware copper fitting, kitchen knife handle ...