The principle of ultrasonic welding

Ultrasonic welding takes advantages of the friction energy generated by the ultrasound at the boundary surfaces. When two performs are pressed together at their connecting surface and excited using high-frequency ultrasound, the surface of the two parts generate so much energy that their connecting surfaces fuse together. This works with both metal and plastic parts.
Ultrasonic effect on the thermoplastic plastic contact surface, will produce tens of thousands of times per second high-frequency vibration, which reaches a certain amplitude of high-frequency vibration, through the welding the ultrasonic energy to the welding area, the welding area which is two interface of the weld has a large acoustic impedance impedance, thus it will create partial high temperature. And because of poor thermal conductivity of plastic, is not timely dissemination, gathered in the welding area, resulting in two plastic contact surface melting quickly, add certain pressure, make it together. When ultrasonic stop working, let the pressure for a few seconds, make its solidified, thus forming a strong molecular chain, achieve the purpose of welding, the welding strength can meet close to the strength of raw materials.
Ultrasonic metal welding principle is the use of ultrasonic frequency (more than 16KHz) of the mechanical vibration energy, a special method of connecting the same metal or dissimilar metals. Metal in ultrasonic welding, neither conveying current to work-piece , nor to the work-piece with high temperature heat source, only in the static pressure, the wire frame vibration energy into friction, deformation energy and limited temperature rise between work-piece . The Metallurgical bonding between joints is a kind of solid-state welding which is realized when the base metal does not melt.
Ultrasonic welding has established itself in industry as a very fast, cost-effective and reliable joining technology.