Ultrasonic welding is a joining process in which thermoplastics are bonded together. The two parts being joined do not have to be made of the same thermoplastic material. The ultrasonic vibrations cause friction between the touching surfaces. This generates heat, which causes the material to melt. Ultrasonic welding is characterized by fast process times and high process reliability. In addition, no additives or solvents are required.

Ultrasonic welding: Standard lifting machines, continuous process and spot welding

Standard lifting machines

For ultrasonic welding, standard lifting machines with component-specific changing devices are frequently used. The number and positioning of the sonotrodes on the fixture are individually adapted to the application. For high surface requirements, a foil tension can be integrated, which ensures a pressure-free welding. Due to the change-over devices, different components can be produced on the same machine with minimum set-up effort.

In addition to standard lifting machines, we also develop individual concepts. The ultrasonic unit, for example, can be integrated as a station on a rotary indexing table or in a transfer system.

Continuous process

Ultrasonic welding can also be used in an endless process. Endless products – such as textiles or extruded profiles – are combined. We not only take care of the assembly, but also the subsequent processes: from laser or punching to cutting and packaging or simply winding.

Spot welding

In spot welding, also known as riveting, individual points are formed by direct contact with the sonotrode in such a way that a positive connection is created. The advantage of this process is that only one of the components has to be thermoplastic.

Component-specific fixtures can also be designed for spot welding. Alternatively, the sonotrode is attached to the robot so that various components can be flexibly riveted.