Studies on Ulltrasonic Butt Welding

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Ultralsonic butt welding by 27 KHz or 19 KHz vibration frequency systema was studied. Welding specimens used were aluminum, anticorrosive aluminum and copper plates of 6 mm thickness. These welding specimens are successfully joined end to end by these 27 KHz and 19 KHz ultrasonic butt welding equipments< The ultrasonic vibration source used consisted of a radial to longitudinal vibra- tion direction converter with 6 ( 27 KHz ) or 8 ( 19 KHz ) bolt-clamped Langevin type PZT transducers of i7 KHz or 19 KHz vibration frequency. Welding specimens used were cut by a bandsaw and some specimens were finished by a milling machine, and only degreased and cleaned by chlorothene and without further finishing. The weld strength of aluminum specimens obtained is about 100 MPa which was nearly equal to specimen strength, and the strength of anticorrosive aluminum and copper specimens obtained was about 250 MPa which is about anticorrosive aluminum specimen strength. Required power for joining (1) aluminum specimens, (2) aluminum to copper specimens, (3) anticorrosive aluminum specimens, and (4) anticorrosive aluminum to copper specimens of 6 mm thickness were 1 --3 KW/cm^2, 2 -- 4 KW/cm^2, 6 -- 8 KW/cm^2, and 7 -- 9 KW/cm^2.The weldment sections of specimens were tested by a microvickers hardness tester. A slight decrease of hardness adjacent to a welding surface was noted, but no decrease was noted by a 19 KHz welding with adequate welding condition.