Oscillatory Friction Stir Welding
Oscillating friction stir welding is a friction stir welding variant with additional high-frequency tool oscillation. It improves material flow and reduces process forces.
Physical-Chemical Mechanism of Action
The rotating tool is additionally moved with a high-frequency oscillation in the feed or traverse direction. This leads to improved material flow and increases the contact area between the tool and the workpiece, making the welding process easier.
Metallurgical Relevance & Risks in Welding
The additional oscillation can improve material flow in difficult-to-weld alloys and reduce the required process forces. However, the frequency and amplitude must be carefully set to avoid tool wear or unwanted vibration patterns.
Workshop Practice & Action Guidelines
Use a frequency of 10-20 kHz and an amplitude of 5-10 µm. Ensure the tool is stable and no unwanted vibrations occur. Monitor process forces and adjust settings accordingly.