Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. Ultrasound is thus not separated from "normal" (audible) sound based on differences in physical properties, only the fact that humans cannot hear it. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy, young adults. The production of ultrasound is used in many different fields, typically to penetrate a medium and measure the reflection signature or supply focused energy. The reflection signature can reveal details about the inner structure of the medium, a property also used by animals such as bats for hunting. The most well known application of ultrasound is its use in sonography to produce pictures of fetuses in the human womb. There are a vast number of other applications as well.

What is ultrasonic bonding?

Ultrasonic welding directs high-frequency vibrations at two components, which are clamped together. This creates a rapid build up of heat that produces a weld, or bond, in only a few seconds without significant melting of the base materials. For bonding synthetic textiles or filter media, the fabric passes under a horn, which directs the ultrasonic vibrations through the layers. The materials are heated up and fused together, making a finished seam or sealed edge.

What are the advantages of ultrasonic welding?

No adhesives or consumables - such as solder or thread - are needed. The weld or bond is produced quickly - usually in two to four seconds - without heating the surrounding area. This process produces ultra-reliable, repeatably accurate welds and bonds. Ultrasonic welding is environmentally friendly, produces no waste, and is economical to use.

What industries use ultrasonic bonding?

Apparel, appliance, automotive, electronics, filtration, home furnishings, medical, and packaging are just some of the industries that can utilize ultrasonic welding.