A method of welding two thermoplastic workpieces (W) together along a predetermined weld line during a weld cycle utilizing a high frequency vibration sonic or ultrasonic welding apparatus. This welding apparatus includes an electroacoustic transducer (18) which transmits such vibrations...http://www.google.es/patents/US5846377?utm_source=gb-gplus-sharePatente US5846377 - Method for processing workpieces by ultrasonic energy
Method for processing workpieces by ultrasonic energy
