Abstract
New ultrasonic metal and plastic welding methods with multiple vibration systems and various complex modes of same and different vibration frequency have been proposed and studied as follows ; (1) ultrasonic spot welding of metal with two vibration systems for joining thick specimens. (2) ultrasonic welding of ring shape weldment with two vibration systems (3) ultrasonic butt welding for joining of thick metal specimens end to end. (4) ultrasonic plastic welding with two vibration systems -- (A) direct welding for joining specimens with small damage and with small power. (B) transmission welding for joining thick and large welding specimens by controlling of vibration phase difference. (5) ultrasonic plastic welding with welding tip pair -- (A) welding tips vibrating vertical to welding surface, and (B) vibrating parallel to welding surfaces for joining of lapped sheet or thin plate welding specimens with the very small width. effective for joining of metal and plastics successfully.
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