Ultrasonic welding is the process by which two pieces of plastic are joined together through the use of high-frequency acoustic vibrations. For the process one half of the component is placed on a fixed anvil and the second half is placed on top. An extension, connected to the transducer on the welding machine, called a “horn” is then lowered down on top of the two components. Once the horn is in place a very rapid low-amplitude acoustic vibration is applied to the moulding in a small welding zone. This vibration causes the acoustic energy to be converted into heat energy and the two components are welded together in a short space of time, typically less than one second.
Ultrasonic Welding is the fastest and most cost effective method used today to join and assemble plastic parts and non-ferrous metals. Ultrasonic welding is cost effective and a green technology. Ultrasonic welding eliminates the need to use fasteners, glues and/or solvents.
The transducer converts high-frequency electrical energy into high-frequency mechanical vibrations. And it contains several piezoelectric ceramic discs sandwiched under pressure between two metal blocks. Between each disc is a thin metal plate, which forms the electrode. When a sinusoidal electrical signal is fed to the transducer via the electrodes, the discs expand and contract, producing axial vibrations.
UItrasonic welding is a method of joining two parts by converting electrical energy into heat energy by high frequency mechanical vibration and is suitable for plastics and metals.
Ultrasonic plastics welding has advantages over joining methods using solvents or adhesives. Production cycle times are usually improved with speeds in the region of 2000 parts an hour being achieved in the most favourable cases.
Ultrasonic welding: ultrasonic vibration with ultrasonic welding mould, the ultrasonic welding energy conduction to the plastic surface, resulting in local temperature, so that the plastic surface melting. Under the pressure of the ultrasonic hand, so to weld plastic, beautiful, strong effect.
Hand held ultrasonic welding machines, also known as portable ultrasonic welding machines, hand held ultrasonic welding machines, hand-held welding machine, portable welding machine, ultrasonic spot welding, riveting machines, ultrasonic point welder