Effects of Ultrasonic Vibration on Diffusion Welding of Aluminum(Materials, Metallurgy & Weldability)

概要

論文の詳細を見る
As a pretreatment of the diffusion welding of aluminum, the ultrasonic vibration has been applied to the bond interface in an attempt to break up the superficial oxide film by frictional movement between faying surfaces induced by the ultrasonic. The application of ultrasonic vibration and subsequent welding have been carried out in a vacuum of 10^<-2>Pa at a temperature of 873K to 893K under a pressure to the bond interface of 1MPa to 3MPa. The bond strength increased as the input power to the transducer and working time of ultrasonic vibration were increased. The increase in pressure to the bond interface during the ultrasonic vibration, however, lowered the bond strength. TEM observation and electric resistance measurement of the bond interface revealed that the application of ultrasonic vibration had the effect of breaking up and dispersing the oxide film, which was closely related to the increase in bond strength. On the fractured surface of joint, portions showing a dimple pattern were observed only when the ultrasonic vibration was applied, increasing in area with the rise in bond strength. These portions may be regarded as places where the application of ultrasonic vibration promotes breaking up and dispersing the oxide film.
大阪大学の論文