There are multiple possibilities for using ultrasound in processing plastic materials. The equipment that is used depends on the specific application, outlined and described below. They all share some parts in common, such as the ultrasound generator, transducer and the tool called sonotrode. The sonotrode generates an ultrasound vibration between the parts. This intense vibration generates heat and consequently the thermoplastic materials melt, ensuring the part welding and assembly.

The assembly of thermoplastic materials using vibration welding occurs when two surfaces that come into contact are melted. The increase in temperature needed for the melting process is obtained by rubbing the two pieces to be welded. Pressure is applied to the moving piece in order to keep the parts to be assembled in contact during the welding process. This technology is suitable for welding thermoplastic materials with complex shapes or particular materials, offering a valid alternative. In some cases, it is a better option than ultrasound welding.

The welding of thermoplastic materials  using spin welding, occurs as the result of the melting of the contact surfaces. The temperature increase necessary for the melting process is obtained through the rubbing of one of the two pieces to be welded.

The hot plate welding principle is simple and intuitive. Thermoplastic materials are by their very nature heat sensitive. Using this technology material melting occurs as the result of direct contact with an heated plate whose temperature is controlled electronically.