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LI Yulong, CONG Baoqiang, QI Bojin, YANG Mingxuan. Weld appearance of 2219-T87 high strength aluminum alloy at different pulse frequency[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2013, (12): 67-70.
Citation: LI Yulong, CONG Baoqiang, QI Bojin, YANG Mingxuan. Weld appearance of 2219-T87 high strength aluminum alloy at different pulse frequency[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2013, (12): 67-70.

Weld appearance of 2219-T87 high strength aluminum alloy at different pulse frequency

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  • Received Date: September 09, 2012
  • Based on hybrid ultrahigh frequency pulse variable polarity gas tungsten arc welding process of 2219-T87 high strength aluminum alloy,the effect of pulse frequency on weld appearance was analyzed.Experimental results show that the pulse frequency has a great impact on arc characteristics and the molten pool flow behavior,which makes significant changes in the weld width,depth and penetration.When the pulse frequency fH is less than 60 kHz,the weld width and depth increase with the increase of pulse frequency.The weld penetration is hardly changed with fH< 35 kHz,while it is considerably improved by at least 34% compared with the conventional variable polarity GTAW process when fH> 35 kHz.When the pulse frequency reached up to 60 kHz,the weld penetration significantly increases by 60% compared with the conventional variable polarity GTAW process.When the pulse frequency fH> 65 kHz,the weld width,depth and penetration presented show the downward trend.
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