Rotational Friction Welding
Rotary friction welding is a pressure welding process where the joining partners are pressed together rotationally to reach forging temperature through frictional heat. Upsetting is done without filler material.
Physical-Chemical Mechanism of Action
The parts being joined are pressed together while rotating, which increases friction and thereby releases thermal energy. This energy leads to a forging temperature at which metallic bonds are rearranged.
Metallurgical Relevance & Risks in Welding
Insufficient pressing can prevent the temperature from rising enough, resulting in no visible joint. Excessive pressing or too high speed can cause surface damage or excessive grain growth.
Workshop Practice & Instructions
Make sure the parts to be joined are clean and smooth. Use a speed of 10-20 m/min and a pressure of 50-100 MPa. The duration of the process depends on the material, but should be at least 30 seconds.