Abstract
Ultrasonic Welding is the method to weld metal specimens clamped between a welding tip and an anvil by ultrasonic vibration energy, and the direction of welding tip vibration is parallel to the specimen surfaces. It is expected that the vibration characteristics of specimens has direct affects on the weld strength.The purpose of the study is to investigate the effects of specimens vibration characteristics on the weld strength.At the experiments, the frequency auto-tracking and constant vibration velocity control type welding equipments are used.The results obtained are as follows;1) Equivalent circuit of weldment is derived.2) Weld strength is affected by the resonance and anti-resonance of logitudinal and bending vibration etc ofspecimens.3) Welding is almost impossible in the case the upper specimen is at anti-resonance of longitudinal vibration.4) Adequate change of vibration direction is useful to obtain stable weld strength.
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