Friction Stir Welding
Friction forge welding is a solid-state joining process where frictional heat plasticizes and mixes the material without melting.
Physical-Chemical Mechanism of Action
A rotating forming pin presses the steel parts to be joined together. The friction between the pin and the materials generates heat that plasticizes the metal crystals. This allows a form-fit connection of the parts without melting.
Metallurgical Relevance & Risks in Welding
Correct temperature and pressure regulation are crucial to achieve a homogeneous joint. Too little heat leads to insufficient plasticized areas, which can cause cracks or weak spots. Too much heat can lead to over-plasticization and distortion of the parts.
Workshop Practice & Instructions
Use a forming pin with the correct rotational speed (in RPM) and pressure (in N/mm²). Heat generation depends on the materials and the pin geometry. Regulate temperature by continuous measurement and adjustment of pressure and speed.