<< <i>The ultrasonic horn vibrates at high frequency and rubs the plastic parts together. The friction at the localized contact points cause the plastic to melt and weld. >>
Actually, there is no rubbing that occurs. The vibration is not back-and-forth (shear vibration). It is compressive oscillation.
The two parts are compressively loaded and unloaded very, VERY, quickly.
Comments
<< <i>The ultrasonic horn vibrates at high frequency and rubs the plastic parts together. The friction at the localized contact points cause the plastic to melt and weld. >>
Actually, there is no rubbing that occurs. The vibration is not back-and-forth (shear vibration). It is compressive oscillation.
The two parts are compressively loaded and unloaded very, VERY, quickly.