In the industry the ultrasonic plastics welding process is used for 40 years for welding of thermoplastics. The multiple areas of application in the different industries make the ultrasonic plastic welding essential. The areas are welding half shells in different forms, self stamping, shaping, thermal cutting, placing the swage-head and so on.

30 years ago, the result of the further development is the welding of metal. The difference between the welding of metal and platics is the weld axis, the physics are the same. The welding of plastics is used in the vertical axis of oscillation. Thereby it happens a plastication and a bonding of the different materials.

The welding of metal is used in the horizontal axis of oscillation. It happens friction between the materials and they bond to each other.

The chosen pressure and the time of the welding cause the molecules to move and create a homogeneous bonding. The are different materials that can be chosen for bonding. For example non iron materials like copper, brass and aluminium.

In most cases the industry works with a frequency of 20Khz, because the scope is the biggest at this frequenz to cover the variety of different applications. But also frequencys like 35 and 40Khz are used in the industry. The generator, which has 20Khz, 3KW ( and more ) in most cases is used with 230 V and 50/60 Hz. He transforms the incoming 50/60Hz into 20 000 Hz. This electrical oscillation energizes the converter, which has 2 or 4 piezoceramic-disks. At a voltage of 3000 V the converter expands in its longitudinal axis about 10 - 15 µm. The created mechanic amplitude is now under- or overstocked via a booster and forwarded to the sonotrode where the welding takes place.