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Characteristics of hafnium electrode erosion for the ultrasonic-frequency pulsed plasma arc cutting

Wang Jiayou,He Conghui,Chen Jian,Fang Chenfu,Gao Fei(Provincial Key Laboratory of Advanced Welding Technology,Jiangsu University of Science and Technology,Zhenjiang Jiangsu 212003,China)  
The present work presents an ultrasonic-frequency pulsed arc approach to improving effectively the service life of plasma arc cutting electrode.By a number of electrode burning experiments,the effects of pulsed arcing conditions on electrode weight loss and erosion morphology were then investigated,and also the mechanism of hafnium electrode erosion was analyzed.Experimental results show that the cathode zone of the arc shrinks obviously,the erosion scope and depth decrease on the electrode,and thus the life of the electrode is remarkably improved with appropriately increasing the frequency of the pulsed current.Furthermore,the better results of electrode erosion resistance can be obtained at lower pulsed currents.
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