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目前在我国机器制造业中,所采用的电火花强化大都是以直流电进行强化。其实用交流电来强化刀具及机器另件,也能获得相同的效果,这已被许多苏联学者的研究结果所证实(见刀具的电火花强化论文集,1951年版44页)。交流强化的优点是不需要一套整流设备,结构简单、制造方便、成本低、经济效果高。交流强化的原理亦借助於脉冲放用的结果,使被强化的金属表面在极其短促的时间(10~(-3)～10(-5)秒)内受到由於高密度的电子流发射所产生的高温(6900～11000℃),使作用点的金属溶化、汽化,随着爆炸喷射到另一电极及空间。由火花所作用到的极其微小的金属表面受热部份,同时又被周围冷金属基体极迅速的冷却,至使溶化金属来不及相变,不经结晶就凝固,而得到超高速度的表面淬
Currently in our country’s machinery manufacturing industry, the EDM used in the strengthening of mostly DC. In fact, the use of alternating current to reinforce knives and other pieces of machinery can achieve the same result. This has been confirmed by the findings of many Soviet scholars (see EDS Intensive Articles, 1951, p. 44). The advantage of exchange strengthening is that it does not need a set of rectifying equipment, has the advantages of simple structure, convenient manufacture, low cost and high economic effect. The principle of AC enhancement is also based on the results of pulsed discharge, resulting in the metal surface being strengthened due to the high density electron current emission in a very short period of time (10 -3 to 10 -5 seconds) Of the high temperature (6900 ~ 11000 ℃), the role of the metal melting point, vaporized, with the explosion spray to the other electrode and space. By the sparks to the extremely small metal surface heating part, but also by the cold around the very rapid cooling of the metal matrix, so that the molten metal too late to phase transition, solidification without crystallization, and get ultra-high speed surface quenching