... IGBT series resonance circuit 2.have CE,SGS 3.application in hardening, forging,etc 4.save energy,safety 1.detalied technique ... only need 10 minutes to learn the skill.3.Application of kechuang high frequencyHeat treatingVarious kind of automobile parts, ... plating.Other fieldsSemi coductor single crystal upspring,heating fitting in,heat seal,powder applicating,embedding plastic to metal,etc. ...