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Ultrasonic plastic welding is the joining of thermoplastics through the use of friction heat caused by high frequency mechanical vibrations. Welding is accomplished by applying low amplitude ( 1 to 250 µm ) high frequency( 15 to 30kHz ) to workpiece by a vibrating tool called a “horn”.
The mechanical motion produces the frictional heat at the joining surface of the plastic parts. In effect, the plastic material at the joint surface melts and forms a molecular bond between the parts.