Ultrasonic welding

Ultrasonic welding (USW) is a solid-state welding process that produces a weld by local application of high-frequency vibratory energy while the work pieces are held together under pressure; is one of the most popular methods for joining plastics and it is becoming an important method for welding polymeric composites. Ultrasonic welding uses a piezo-electric element to generate ultrasound (typically around 15 to 70 kHz), which is projected into the plastic parts to be joined.