北京航空航天大学学报 ›› 2009, Vol. 35 ›› Issue (2): 132-136.

• 论文 • 上一篇    下一篇

0Cr18Ni9Ti超音频脉冲TIG焊接头组织与性能

齐铂金, 许海鹰, 张 伟   

  1. 北京航空航天大学 机械工程及自动化学院, 北京 100191
  • 收稿日期:2008-07-20 出版日期:2009-02-28 发布日期:2010-09-16
  • 作者简介:齐铂金(1963-),男,湖南湘潭人,教授,qbj@buaa.edu.cn.

Microstructure and property analysis of 0Cr18Ni9Ti joints welded by ultra-sonic pulse tungsten-inert-gas welding technology

Qi Bojin, Xu Haiying, Zhang Wei   

  1. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2008-07-20 Online:2009-02-28 Published:2010-09-16

摘要: 采用研制的基于新型IGBT拓扑电路的超音频直流脉冲TIG焊电源焊接0Cr18Ni9Ti奥氏体不锈钢,并与常规直流TIG焊获得的接头进行对比.分别对各接头进行X-射线探伤检测,接头的抗拉强度测试,焊缝金相显微组织与拉伸断口SEM照片观察对比.试验结果分析表明:采用超音频脉冲TIG焊工艺的焊接接头,随着脉冲电流频率提高,焊缝的粗晶区变窄,晶粒逐渐细化,且焊缝中心细小等轴晶所占区域扩大;与常规直流TIG焊相比,30kHz的超音频直流脉冲TIG焊焊缝中心晶粒更细小,接头的抗拉强度与延伸率分别得到提高.

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.

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