Plastic welding

A process of joining two plastic parts by applying vibration. The vibration causes melting at the interface between the two parts. When the melt solidifies after welding, the two parts are joined.

In ultrasonic welding, the applied vibration is usually perpendicular to the plane of the boundary between the two parts. At low frequencies (120 Hz, 240 Hz, etc.) shear welding is often used.

Also see —
Metal welding
Spot welding