How to choose the power and frequency of ultrasonic welding matchine?

  It is complex to choose a suitable ultrasonic welding machine. At the same time, you should consider many factors. Usually, the selection is based on product size and welding requirements. 

    When choosing the ultrasonic welding machine, one of the key factors to be considered is the operating frequency. The operating frequency range of most equipment on the market is 20 khz~40 kHz, and the operating frequency of some equipment is 10~70 kHz. Different ultrasonic frequencies correspond to different sizes of ultrasonic transducers. The use of lower amplitude of ultrasonic mould or thin-walled weldments can help to reduce the resonance of weldments, because resonance can mostly lead to the damage of weldments. Increasing the working frequency or vibration amplitude will increase the power loss in polymer. Therefore, in most cases, higher operating frequency is the only available method to obtain lower amplitude and higher power. 

    After determining the working frequency, the power should be taken into account. Each workpiece frequency can generally have several power levels. For example, the power range of the ultrasonic welding machine provided by most equipment manufacturers is 1 ~ 5Kw at the working frequency of 20kHz. In most cases, the required power can be determined experimentally in the laboratories of suppliers, research institutions and universities. If the required power can not be determined theoretically in advance, it is better to select the maximum power to ensure that the equipment can meet the application requirements. 

    Similarly, when choosing equipment, it is necessary to determine whether the fittings are most suitable for cut-in welding or continuous welding. In the case of stitched weldments, most equipment manufacturers have such standard equipment, and they can also provide other standard rotary anvils with many patterns. Most anvils are cut, sealed and welded. Special equipment must be designed if weldments require very wide continuous welds (from 130 PX to 3050 PX or more). 

    Other equipment factors include control level, amplitude control, amplitude contour and storage program control capability. For some applications, these options can improve welding quality and density. On the other hand, testing in an application laboratory can help determine which options are needed.