Fig. 1 Schematic diagram of pulsed power supply superposed with RF oscillating wave: ( a ) frequency regulation unit, ( b ) amplitude regulation unit, and ( c ) superposition unit More

Fig. 2 Schematic regulation process of pulsed power supply superposed with RF oscillating wave More

Fig. 3 RF oscillating wave generator module applied in basic-pulsed power modes: ( a ) RC-relaxation mode, ( b ) single-switch chopper mode, and ( c ) Tr-RC mode More

Fig. 4 Experimental setup with RF oscillating wave generator module More

Fig. 5 Comparison of discharge waveforms before and after superposed with RF oscillating wave: ( a ) before superposed with RF oscillating wave and ( b ) after superposed with RF oscillating wave More

Fig. 6 Discharge waveforms after superposed with different oscillating amplitudes: ( a ) superposed with oscillating amplitude of ±10 V, ( b ) superposed with oscillating amplitude of ±15 V, and ( c ) superposed with oscillating amplitude of ±20 V More

Fig. 7 Discharge waveforms of basic-pulsed power modes superposed with RF oscillating wave: ( a ) RC-relaxation mode, ( b ) single-switch chopper mode, and ( c ) Tr-RC mode More

Fig. 8 Microhole machining efficiency of basic-pulsed power modes before and after superposed with RF oscillating wave More

Fig. 9 Servofeeding distances of Z -axis during machining process under different oscillating amplitudes More

Fig. 10 Microhole machining efficiency under different open-circuit voltages and oscillating amplitudes More

Fig. 11 TWR under different oscillating amplitudes using open-circuit voltage of 140 V More

Fig. 12 Taper error under different oscillating amplitudes using open-circuit voltage of 140 V More

Fig. 13 Machining results of microholes under different oscillating amplitudes using open-circuit voltage of 140 V: ( a ) without superposition, ( b ) oscillating amplitude of ±10 V, ( c ) oscillating amplitude of ±15 V, and ( d ) oscillating amplitude of ±20 V More

Fig. 14 Measurement results of discharge times within 100 ms at given interelectrode gap under different oscillating amplitudes More

Fig. 15 Schematic identification process of proper oscillating amplitude More

Fig. 1 Schematic of welding condition of thin sheet samples More

Fig. 2 Schematic of the experimental setup More

Fig. 3 ( a ) Three-dimensional solid element, ( b ) 3D meshed element, ( c ) time independence check, and ( d ) mesh independence check More