Ultrasonic welding is the ultrasonic vibration generated by the transducer, which generates high-frequency friction and heat generation on the surface of the welded object contacting the gap under pressure, so as to achieve the purpose of hot-melt welding. Ultrasonic energy-concentrating transducers are high-power ultrasonic transducers that work in gaps or pulses, and their power is generally calculated based on the instantaneous peak power.
The whole connected with the ultrasonic transducer and the horn is called the vibrator. Ultrasonic transducers can produce regular vibrations under appropriate electric field excitation, and their amplitude is generally about 10μm. Such an amplitude is not enough to directly complete the welding and processing procedures. After connecting to a reasonably designed horn, the amplitude of the ultrasonic wave can be changed in a wide range. As long as the material is strong enough, the amplitude can exceed 100μm. On the other hand, when the horn performs longitudinal expansion and contraction vibration, the movement directions of the mass points on the left and right sides of a certain cross section in the middle are just opposite, which is equivalent to the existence of a relatively static nodal plane. This nodal surface is called a node, which is also the best fixed point of the vibrator. Deviation from the fixed node of this node will reduce the working efficiency of the vibrator, commonly known as leaky wave. Generally speaking, aluminum horns have high sound transmission efficiency, but the material strength is low, easy to crack and threaded holes; steel horns have high strength, but relatively large acoustic impedance; titanium alloy horns have good overall performance and disadvantages It is expensive and difficult to process.

Ultrasonic welding transducer; widely used in electronics, electrical appliances, plastics, home appliances, toys, automobiles, packaging, communications, and medical applications. Ultrasonic welding machines are used to weld plastic products, replacing screws, buckles, glue and other paste solvents, saving materials and welding The final product is firm and the welding efficiency is high. Its advantages are to increase production efficiency by multiple times, reduce costs, and improve product quality.