Ultrasonic wire bonding using high frequency 330, 600 kHz and complex vibration 190 kHz welding systems

Abstract

Welding characteristics of ultrasonic wire bonding using a same frequency complex vibration welding system of 190 kHz and high frequency linear vibration welding tips of 330 and 600 kHz are studied. The welding equipment used is (1) same vibration frequency complex vibration wire bonding systems of 190 kHz and (2) high frequency linear vibration wire bonding systems of 330 and 600 kHz. Complex vibration welding tip locus shapes are controlled from linear to elliptical, and circular, by regulating the driving vibration systems. The required vibration velocity of the complex vibration system is about half to one third compared with linear vibration systems. The required vibration velocity of the high-frequency bonding system of 600 kHz decreases to about one-fifth that of the 60 kHz conventional bonding system. Using high frequency and complex vibration systems, the weld strength becomes independent of the direction between welding tip vibration and wire length.