Studies on Ultrasonic Butt Welding

Ultrasonic butt welding to join metal specimens end to end is proposed a nd studied. The author has proposed a ultrasonic spot welding with two vibration systems and this method is shown very effective for joining of thick metal plates and it becomes possible to weld about 10 mm thick aluminum plates successfully which was impossible to join by convensional ultrasonic spot welding method with one vibration system. But in the case where aluminum thickness increases over 8 mm, ultrasonic s pot welding becomes very difficult. Ultrasonic butt welding to join specimens end to end is therefore more effective than spot welding for specimens of larger thickness. Aluminum specimen plates of 10 mm thickness were successfully welded end to end with a weld strength per unit area of 90 MPa which is nearly equal to specimen strength. Also, 6 m thick aluminum and copper plates were welded successfully. The ultrasonic butt welding system was shown to be very effective to weld thick metal plates.