First of all, the vibration frequency depends on the natural frequency of the mechanical system. For general equipment, its size is practically constant, unless there are special requirements. When selecting the vibration frequency, consider the nature and thickness of the welding material. When the thickness of the welding material is reduced, it is better to use higher frequency ultrasonic waves. In this case, adding frequency should be used as a way to reduce the amplitude without changing the sound power. After the amplitude is reduced, the positive and negative alternating stress acting on the weldment will also be reduced, thereby reducing the risk of fatigue damage. This risk is very large when welding particularly thin weldments. If the height is increased, the vibration energy consumed in the process of transmitting vibration to the weld will also increase. From this, we know that when welding thicker weldments, we should choose low-frequency ultrasonic vibration.

Principle of oxygen mask ultrasonic welding machine:
The working process of welding with ultrasonic is like this. First, the signal generator sends out a fixed frequency signal (fixed frequency is the working frequency of the transducer), which is converted into electrical energy by the transducer to generate high-frequency mechanical vibration to act on the welded. On the object; secondly, the friction generated by the vibration causes the surface temperature of the object to rise, and the melting occurs when the temperature is higher than the melting point. The gap between the interfaces is completely filled, the mechanical vibration stops, the object is cooled and formed under a certain pressure, and the welding between the objects is facilitated. finished.