Ultrasonic Wire Bonding Using a Complex Vibration Welding Tip

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Ultrasonic wire bonding using a complex vibration welding tip is proposed and studied to improve welding characteristics of ultrasonic wire bonding of thin various metal wires. The welding system designed consists of a complex transverse vibration rod driven by a 40 kHz and a 60 kHz ultrasonic longitudinal vibration systems. These vibration systems are driven simultaneously by independent vibration controllers and amplifiers. Welding specimens used are 0.05 mm to 0.15 mm diameter aluminum wires and 1.0 mm thick copper plates. These welding specimens are welded successfully by the complex vibration welding equipment. And also, using this method, the weld strength of wire bonding becomes independent to the direction difference between welding tip vibration and wire length.

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