Amplitude describes the movement produced by an ultrasonic welding stack during operation. It is one of the most important process parameters because the correct amplitude helps generate the required heating and material flow at the joint interface.
The final horn amplitude is influenced by the output of the converter and the gain characteristics of the booster and horn. Different thermoplastic materials and applications can require different amplitude ranges. Too little amplitude may result in incomplete welding, while excessive amplitude can damage the component or produce unwanted defects.
This guide explains ultrasonic amplitude in simple terms and shows how converters, boosters and horns work together to determine the final vibration delivered to the plastic component.