External Drive Friction Welding
Friction welding with an external rotating head uses a third, external ring or sleeve around the joint area that rotates to generate frictional heat. Once welding temperature is reached, it is removed or integrated.
Physical-Chemical Mechanism of Action
The external rotating head generates friction heat through its rotation, which heats the workpiece. This process is especially effective for difficult materials or geometric shapes.
Metallurgical Relevance & Risks in Welding
Correct use of the rotating head prevents uneven heating and minimizes the risk of porosity. However, incorrect speed settings or too high RPM can lead to overheating or excessive flash, causing distortion or destruction of the parts.
Workshop Practice & Instructions
• Speed: 100-200 RPM for the rotating head.
• Temperature control: Monitor the welding temperature continuously with an infrared sensor.
• Head removal: Remove the rotating head as soon as the desired temperature is reached to minimize the risk of overheating.