Linear vibration friction welding utilizes frictional heat generated at the contact surfaces of two parts to be welded to melt the plastic. The heat energy is generated by moving one workpiece back and forth across the other surface at a certain displacement or amplitude under pressure. Once the desired degree of welding has been achieved, the vibration stops, while a certain amount of pressure is still applied to the two workpieces, causing the just-welded portion to cool and solidify, resulting in a tight bond.
Orbital vibration friction welding is a method of welding that utilizes frictional heat energy. In orbital vibratory friction welding, the upper workpiece moves in an orbital motion - a circular motion in all directions - at a fixed speed. The motion generates heat energy that brings the welded portion of the two plastic parts to the melting point. Once the plastic begins to melt, the motion stops and the welded portions of the two workpieces will solidify and join together securely. Small clamping forces result in minimal distortion of the workpiece, and workpieces up to 10 inches in diameter can be welded with orbital vibratory friction.