Attention Points for Matching Transducers

Frequency matching is very important

This is firstly because the ultrasonic transducer can only operate at its resonant frequency point, so the driving power supply, amplitude lever, and welding mold (tool head) should all operate at this frequency. Generally speaking, we hope that the maximum difference does not exceed ± 0.1kHz, and it would be better if it could be smaller. We strongly recommend that you match the welding mold (welding head) with a frequency lower than the oscillator frequency of about 0.1kHz (small signal frequency). At the same time, it should be considered that after the ultrasonic transducer is connected to the amplitude converter and mold head, the resonance frequency peak of the system becomes very sharp, that is, the bandwidth is very narrow, the mechanical quality factor is large, and even a slight frequency deviation will cause a significant increase in impedance. Reflected in the driving power supply is the protection against high or overload of the power supply (amplitude meter electric power). If it happens to be an idle adjustment at this time, it is likely to cause chip misalignment, chip cracking, or center screw breakage.

Power matching and impedance matching mainly consider that the ultrasonic welding system operates in a gap type manner, with significant load changes. Sufficient power output is required during welding, and the minimum amplitude should be controlled under no-load conditions. Otherwise, as mentioned earlier, if the input is large when unloaded, the transducer will be damaged. When fully loaded, if the power cannot be increased and the welding is not secure, it is still useless.