Ultrasonic is sound that accelerates down into a ”Sonotrode” (tool) resulting in a mechanical hammering effect. This pounding generates heat in most fabrics. The heat needs to penetrate the first layer in order to join the second layer.
Advantages with ultrasonic welding:
+ Can be used for non-dielectric materials
+ Suitable for detailed welding
Disadvantages with ultrasonic welding:
- The technology creates a high pitch sound
- It is difficult to weld more than two material layers without damaging the surface of the material and causing burns
- The weld area is very limited and the technology is not suitable for larger applications