11/08/2026
Ultrasonic welding at 20 or 35 kHz should be inaudible. Then the part geometry resonates and emits sub-harmonics between 50 Hz and 16 kHz, and the operator hears it all shift long.
Our ultrasonic protective cell contains that noise at the source. SUVA-tested, in serial use since 2013, with an electric or pneumatic sliding window synchronised to the machine cycle.
Watch it run. Details in the comments.