Abstract
Ultrasonic plastic micro-welding with transverse and longitudinal vibration welding tip pairs is studied. (1) A welding tip pair of 20 kHz vibrating perpendicularly, and (2) a welding tip pair of 20 kHz and 27 kHz vibrating parallel to the surfaces to be welded are used for micro-welding of plastic sheet specimens. The welding tips are arranged parallel to each other with a small gap and driven at antiphase vibration mode. Using these welding tip pairs, welding specimens are joined with very narrow width from the upper part of lapped specimens according to the gap distance with no damage to the lower part of the specimens.
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