Crude Aluminum Ultrasonic Wire Bonding Strength Line Monitoring Methods Research

The bond quality of the aluminum wire bond is sensitive to ultrasonic power, bond force, bond time etc. Realizing the bond quality on-line monitoring is very valuable to improve the bond reliability. Contraposing the absence of the methods of effective on-line bond quality forecast, a method was proposed that is obtaining the relations between the current signals and bond quality through the analysis of the transducer drive current.1. An on-line quality monitoring system of the aluminum wire bond was constructed based on the aluminum wire bonder U3000.The sensing circuit was constructed.The signals monitoring system of ultrasonic wire bond was developed based on PCI6110 and LabView. The bonding quality data were gathered by the offline destructive tests.2. The main time-frequency analysis methods were contrasted. According to the characteristics of levity of transducer drive current, the analysis method was found based on wavelet and wavelet package,12 features were selected, such as consumed average energy, changing extent of consumed average energy of bond process, change of consumed energy of upper bond process etc. The relations between the current signals and bond quality were analyzed briefly.3. Contraposing the typical bond conditions,8 features were selected, such as consumed average energy, changing extent of consumed average energy of bond process, change of consumed energy of upper bond process etc. An artificial neural network was set up using these features qua input, bond quality qua output. The relations between the current signals and bond quality were acquired by neural network training. The above methods were applied in the aluminum wire bonder U3000. The recognition of bond failure and estimate of bond quality were realized.