为进一步探索空气中短电弧加工(short electric arc machining,SEAM)放电过程,揭示短电弧放电加工中凹坑形成和材料去除机制,以空气作为介质,探究 0 L/min和 20 L/min空气流量对电弧-熔池和材料去除过程的影响,并进行对比试验研究.结果表明,脉冲持续时间内,电弧经历快速膨胀、变形膨胀、稳定和熄灭 4 个阶段.在电弧膨胀阶段,材料以蚀除颗粒去除为主;在电弧稳定阶段,材料以熔融物与蚀除颗粒去除为主;在放电后续熄灭阶段,材料以熔融物去除为主.此外,连续脉冲放电中容易产生爆炸力,进一步增加金属材料去除量.提高空气流量可增大去除颗粒体积和抑制裂纹产生.
Research on short electric arc pulse discharge process of pure tungsten electrode under different air flow rates
In order to further explore the short electric arc machining(SEAM)process in air and reveal the crater formation and material removal mechanisms,air was used as the medium to explore the effects of air flow rates of 0 L/min and 20 L/min on the arc-molten pool and materials removal process,and a comparative experimental study was conducted.The results show that during the pulse duration,the arc goes through four stages:rapid expansion,deformation expansion,stability and extinction.In the arc expansion stage,the material is mainly removed by erosion particles.In the arc stabilization stage,the material is mainly removed by melt and erosion particles.In the subsequent extinguishing stage of discharge,the material is mainly removed by melt.In addition,the explosive force is easily generated in continuous pulse discharge,further increasing the amount of metal material removed.Increasing the air flow can increase the volume of particles removed and inhibit the occurrence of cracks.
short electric arc machiningpure tungsten electrodepulse dischargearc-molten poolcrater
万方数据
维普
