For welding thicker pieces, automatic frequency control should be adopted.
对于较厚的焊件，应进行频率自动控制。
In order to make the RF source and the waveguide have the same resonant frequency, the automatic frequency control (AFC) system is used.
为了使得射频源和波导管的频率保持一致，采用了自动频率控制系统(afc)。
In order to make the RF source and the waveguide have the same resonant frequency, the automatic frequency control (AFC) system is used.
为了使得射频源和波导管的频率保持一致，采用了自动频率控制系统(afc)。
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