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�������պ����ѧѧ�� 2009, Vol. 35 Issue (2) :132-136    DOI:
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0Cr18Ni9Ti����Ƶ����TIG����ͷ��֯������
�벬��, ��ӥ, �� ΰ*
�������պ����ѧ ��е���̼��Զ���ѧԺ, ���� 100191
Microstructure and property analysis of 0Cr18Ni9Ti joints welded by ultra-sonic pulse tungsten-inert-gas welding technology
Qi Bojin, Xu Haiying, Zhang Wei*
School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� An ultra-sonic pulse tungsten-inert-gas (TIG) welding power source based on new type IGBT topology was developed. 0Cr18Ni9Ti austenitic stainless steel workpieces were welded by ultra-sonic pulse TIG welding and conventional direct current TIG welding respectively. In order to study the difference between joints welded by different welding technology, these weld joints were analyzed by means of X-radial check-up, tensile strength and specific elongation detection, optical-microscope and scanning electron microscope. With the ultra-sonic pulse TIG welding technology pulse current frequency being increased, it can be found that grains will be refined and the width of the coarse grain zone will be narrowed, correspondingly, small equiaxed grains zone will be enlarged. By contrast with conventional direct current TIG welding technology, these joints introduced by 30��kHz ultra-sonic pulse TIG welding technology, have more small equiaxed grains in weld joints core, which indicates grain refinement phenomenon is distinct. The tensile strength and the specific elongation of these joints welded by 30��kHz ultra-sonic pulse TIG welding technology were improved respectively.
Keywords�� ultra-sonic pulse   tungsten-inert-gas welding   austenitic stainless steel   grain refinement     
Received 2008-07-20;
About author: �벬��(1963-),��,������̶��,����,qbj@buaa.edu.cn.
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�벬��, ��ӥ, �� ΰ.0Cr18Ni9Ti����Ƶ����TIG����ͷ��֯������[J]  �������պ����ѧѧ��, 2009,V35(2): 132-136
Qi Bojin, Xu Haiying, Zhang Wei.Microstructure and property analysis of 0Cr18Ni9Ti joints welded by ultra-sonic pulse tungsten-inert-gas welding technology[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(2): 132-136
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