Influence of air pressure on ultrasonic welding

Update:23 Mar 2019

In ultrasonic welding, the pneumatic pressure transmits […]

In ultrasonic welding, the pneumatic pressure transmits ultrasonic vibrations to the weldment through the sonotrode. Different materials determine the amount of pressure required during welding. Choosing a suitable pressure value has a very important influence on the welding results. The following small series will let you know the effect of the pressure on the ultrasonic welding.

If the air pressure is too low, the ultrasonic vibration will not be transmitted to the weldment well, resulting in insufficient friction between the weldment and the weld surface. A large part of the energy will be worn on the sliding surface, and the final result is Can not form an effective weld.

If the air pressure is too high, the vibration energy will be used unreasonably, and the frictional force will be too large, the frictional motion between the weldments will be weakened, and even the amplitude will be affected. The result is the connection between the weldments. The area does not increase but decreases, and the strength of the solder joints also decreases.

Therefore, when using an ultrasonic welding machine, it is recommended that you select the pressure value according to the material of the product.