Ultrasonic cf cards welding machine uses high performance Microprocessor to achieve control by digitalization. All parameter of welding control managed by microcomputer and plus intellectual frequency control system to eliminate inconvenience occurred by manual. Auto-ultrasonic inspection can tracking the best resonance all the time. Machine can make adjustment automatically for ultrasonic and follow frequency changing by temperature of mold to keep the suitable temperature for transducer set. The ultrasonic cf cards welding machine is with IC circuit control design, automatic tracking frequency. The ultrasonic plastic welding machine may be applied in toys, household, electronics, electrical industry, automobile industry...etc.