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�������պ����ѧѧ�� 2009, Vol. 35 Issue (8) :1013-1017    DOI:
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�ӱ�ǿ, �벬��, ���˹�*
�������պ����ѧ ��е���̼��Զ���ѧԺ, ���� 100191
Ultrafast-convert hybrid pulse square-wave variable polarity TIG arc behavior
Cong Baoqiang, Qi Bojin, Zhou Xingguo*
School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� Based on a novel ultrafast convert hybrid pulse variable polarity main circuit topology, the ultrasonic pulse current which had a frequency of more than 20��kHz was superposed in the positive current duration to achieve the hybrid pulse variable polarity current which crossed zero with no dead time and with fast rising and falling edge. The effect of pulse current parameters on the arc characteristics and the behavior of aluminum alloy weld noted by the weld depth and width were studied. The experiment results show that the ultrasonic pulse current has a significant influence on the pinch effect of hybrid pulse variable polarity TIG arc, resulting in the obvious reduction of arc radial dimension. Increasing the pulse current frequency and amplitude as well as decreasing the pulse current duty cycle in special ranges, the weld melt rate is enhanced which may be beneficial to improve the weld quality of aluminum alloy obviously using hybrid pulse variable polarity TIG arc welding technique.
Keywords�� ultrafast convert   ultrasonic pulse current   variable polarity   arc behavior   pinch effect     
Received 2008-08-05;
About author: �ӱ�ǿ(1979-),��,�����ɽ��,��ʿ��,congbq@me.buaa.edu.cn.
�ӱ�ǿ, �벬��, ���˹�.����任�������巽���伫��TIG�绡��Ϊ[J]  �������պ����ѧѧ��, 2009,V35(8): 1013-1017
Cong Baoqiang, Qi Bojin, Zhou Xingguo.Ultrafast-convert hybrid pulse square-wave variable polarity TIG arc behavior[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(8): 1013-1017
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2009/V35/I8/1013
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