[Lindsay] has a wonderful writeup about a new toy in the shop, an ultrasonic transducer. The 28kHz, 70W bolt-clamped Langevin transducer by itself is not much use, you need a power supply ...

Ultrasonic welding is based on high-frequency vibrations (typically ... The end effector is equipped with sensors to measure the process parameters, which are recorded at a sampling rate of 1 kHz.