Ultrasonic welding is a relatively new bonding technique that is evolving all the time. Originally discovered in the 1940's, ultrasonic welding uses ultra-high frequency sound waves to bond materials. The fundamental principle is extremely simple; when an ultra-fast frequency soundwave is introduced to some materials, they melt.
This form of bonding technology is unique because of the control that it offers, and its ability to join dissimilar materials. It is used extensively in the aerospace, automotive, medical and plastic manufacturing industries, but in recent years ultrasonic welding has also been utilised in the manufacture of electronics as well. Because all of the heat is localised in the weld area, this method can be used to bond very fragile materials together.