The ultrasound are sound waves which propagate in any elastic means with frequencies higher than the human can hear. There are multiple possibilities for using ultrasonic in joining and cutting of plastic material. The equipment or frequency and power that is used depend on the specific application. The equipment consist of the part in such as ultrasonic Generator transducer, booster tool called sonotrode or Horn.

The piezoelectric transducer known as converter, covert electrical impulses into mechanical movement. The booster amplifies this movement and transfer it to be to the sonotrode(Horn) Which is brought into cantact with the piece to be welded. Horn can be made from different material and shape as per piece to be welded.