With the strong renewal of electronic and electrical products, the demand for welding of plastic parts is higher and higher. Ultrasonic technology has the advantages of safety, environmental protection, energy saving and no need of adjuvants, which meets the high demand of electronic and electrical industry. Electronic equipment using ultrasonic welding skills include video shell, video disc, computer, electronic watch, mobile phone, MP3, disk, U disk, mobile phone battery, charger, SD card, mobile phone shell, setter, switch socket, etc.