对使用石墨电极进行电火花加工钛合金tc4进行了研究，认为无论脉宽大小均应采用正极性加工。
In this paper, research is done on alloy TC4 machined by EDM using graphite electrode. Positive polarity machining should be used whether the pulse width is big or small.
一个正极性的直流电压加于该电极上。
A positive polarity dc voltage is applied to the electrodes.
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