Rotary friction welding is a forge welding process, in which the heat for joining metallic workpieces is generated by a relative motion of two components while a load is applied. It works in the solid phase without reaching the melting point of the materials. Thus, even materials that cannot be joined by fusion welding can be welded. The weld region is normally narrow and shows a refined microstructure.
Engine valves and gear box lever
Inertia friction welded Airbag inflator
Friction stud welding of aluminium tubes