Ultrasonic welding is an industrial technique whereby high-frequency ultrasonic acoustic vibrations are locally applied to workpieces being held together under pressure to create a solid-state weld. It is commonly used for plastics, and especially for joining dissimilar materials. In ultrasonic welding, there are no connective bolts, nails, soldering materials, or adhesives necessary to bind the materials together. Wikipedia, Ultrasonic Welding
See Also
15.09 - Dissociating Water with Ultrasonic Vibration - Puharich
Ultrasonic
Ultrasonic Cleaning
Ultrasonic Non-Destructive Testing
Ultrasound