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齐铂金, 许海鹰, 周兴国, 黄松涛. 快变换超音频直流脉冲TIG焊[J]. 焊接学报, 2009, (7): 57-60.
引用本文: 齐铂金, 许海鹰, 周兴国, 黄松涛. 快变换超音频直流脉冲TIG焊[J]. 焊接学报, 2009, (7): 57-60.
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QI Bojin, XU Haiying, ZHOU Xingguo, HUANG Songtao. Fast transform ultra-sonic pulse TIG welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (7): 57-60.
Citation: QI Bojin, XU Haiying, ZHOU Xingguo, HUANG Songtao. Fast transform ultra-sonic pulse TIG welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (7): 57-60.
shu

快变换超音频直流脉冲TIG焊

Fast transform ultra-sonic pulse TIG welding

    摘要
  • 摘要: 采用新型IGBT拓扑电路研制出一台电流快速变换的超音频直流脉冲TIG焊电源.该电源输出的最大脉冲电流频率30kHz,脉冲电流变化率di/dt在50A/μs以上.采用该电源焊接0Cr18Ni9Ti奥氏体不锈钢,并与常规直流TIG焊接头进行对比.分别对这两种接头进行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.结果表明,快变换超音频直流脉冲TIG焊能使奥氏体不锈钢焊缝的粗晶区变窄,细小等轴晶所占区域扩大,焊缝晶粒细化,焊接接头的抗拉强度与断后伸长率分别得到提高.

     

    Abstract: A current fast transform ultra-sonic pulse TIG power source based on new type IGBT topology was developed. The supremest output pulse current frequency is 30 kHz. The pulse current change rate is up to 50 A per microsecond. 0Cr18Ni9Ti austenitic stainless steel was welded by this fast transform ultra-sonic pulse TIG welding and conventional DC TIG welding respectively. These joints were analyzed by X-radial check-up, tensile strength and specific elongation detection, optical-microscope and scanning electron microscope to study the difference between joints welded by different welding technologies. The result shows that fast transform ultra-sonic pulse TIG welding can refine grain and narrow the width of the coarse grain zone. These indicate that welding quality is improved by introducing fast transform ultra-sonic pulse TIG welding technology.

     

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