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杨舟, 齐铂金, 从保强, 杨明轩, 李玉龙. 脉冲电流频率对TC4钛合金焊缝成形的影响[J]. 焊接学报, 2013, (12): 37-40.
引用本文: 杨舟, 齐铂金, 从保强, 杨明轩, 李玉龙. 脉冲电流频率对TC4钛合金焊缝成形的影响[J]. 焊接学报, 2013, (12): 37-40.
YANG Zhou, QI Bojin, CONG Baoqiang, YANG Mingxuan, LI Yulong. Effect of pulse frequency on weld appearance behavior of TC4 titanium alloys[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2013, (12): 37-40.
Citation: YANG Zhou, QI Bojin, CONG Baoqiang, YANG Mingxuan, LI Yulong. Effect of pulse frequency on weld appearance behavior of TC4 titanium alloys[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2013, (12): 37-40.

脉冲电流频率对TC4钛合金焊缝成形的影响

Effect of pulse frequency on weld appearance behavior of TC4 titanium alloys

  • 摘要: 基于超高频脉冲钨极氩弧焊技术,完成了TC4钛合金焊缝熔透特性试验,研究分析了脉冲电流频率对焊缝成形参数的影响及其作用规律.结果表明,脉冲频率f≤65kHz时,熔深、熔宽随脉冲频率的变化趋势基本一致,与常规直流相比,熔宽至少降低了12%;当f处于20~40 kHz的范围内,深宽比上升趋势明显,脉冲频率进一步增加,深宽比的变化趋于稳定;f>70 kHz时,熔宽最大减小了约35%,熔深小幅增长,深宽比提高显著.结合电弧形态试验结果分析发现,超高频脉冲电流引起的电弧形态变化是焊缝成形随脉冲频率变化的主要原因.

     

    Abstract: An experimental of weld penetration of TC4 titanium alloys was carried out by using ultrahigh frequency pulsetungsten inert gas welding process.The effect of pulsed current frequency on weld appearance was investigated.The experimental results show that when pulse frequency f ≤ 65kHz,the variation of welds depth and width with the increment of pulse frequency are basically the same trend,and compared with conventional GTAW process,the weld width decreased by more than 12%.In the range of 20~40 kHz,the weld depth-to-width ratio increases obviously,while it tends to be stable with further increase of pulse frequency.The weld width decreases approximately by 35% as pulse frequency is higher than 70 kHz.Meanwhile, the weld depth increases slightly and the depth to width ratio can be enhanced strikingly with ultra-high frequency.Based on the data from experiment of arc profile,the most dominant mechanism for the variation of weld appearance can be considered as arc constriction caused by pulse frequency.

     

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