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What is ultrasonic transducer
Ultrasonic transducers are piezoelectric ceramics that resonate at ultrasonic frequencies and convert electrical signals into mechanical vibrations by the piezoelectric effect of the material. When the transducer is used as a transmitter, the electrical oscillating signal sent from the excitation source will cause a change in the electric or magnetic field in the electrical energy storage element of the transducer, which changes the mechanical vibration system of the transducer through some effect. A driving force is generated to cause it to vibrate, thereby propelling the medium in contact with the mechanical vibration system of the transducer to vibrate and radiate sound waves into the medium.Ultrasonic welding works by high-frequency ultrasonic acoustic vibrations. The piezoelectric effect allows the conversion of high-frequency electrical energy to high-frequency mechanical energy. The vibrations are applied to the materials being welded by a vibrating tool. The actual welding is a result of the frictional heat and agitation generated where the two materials meet, leading to a local softening or melting. This, together with the mechanical agitation, leads to a strong weld.
An ultrasonic welding device is typically fitted with one or more piezo bulk components. A typical design for the bulk component uses a ring of a hard doped piezoceramic material. We provide high quality bulk components that can be custom designed on a range of parameters: Piezoceramic material, electrode pattern and material, dimensions and frequency tolerances etc. Materials with low losses at high electrical field allow the generation of high mechanical power without excessive self-heating.
The transducer in the ultrasonic welding device is driven at high electrical field to provide the highest mechanical power. The movement of the piezo element is amplified using a sonotrode or “horn”, the whole assembly being preloaded to cope with the high dynamic forces. We offer to custom design the transducer for ultrasonic welders to match your specific requirements.
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