As in metal working, moulded parts made of plastic can also be flanged. This way plastic components can be joined together and also combined with materials of a different nature. According to the task to be performed, the sonotrode should be contoured on its work surface in order to plasticise and form edges, pins, projections or other fastening devices.
Ultrasonically produced flanges are particularly economical. The processing times are comparable to the usual cycles in the ultrasonic welding of mouldings. When glass parts are being flanged the sonotrode must not come into contact with the glass part.