ABSTRACT Real surface temperature of the molten pool was studied with an infrared image, and it was aim to evaluate the temperature filed with pulsed arc welding. A calculation and calibration algorithm were proposed with standard black body, thermocouple outside molten pool, solidus and liquidus temperature. The comparison between conventional DC and pulsed arc was discussed. The results proved that pulsed arc created molten pool efficiently with better roundness, and caused narrow surface HAZ. The surface temperature distributed uniformly on most area of the molten pool at 100A–10 kHz, meanwhile the average grain size decreased by 16.6%. The effect of pulsed arc was the domain for surface solidification. The divergent trend occurred at 200 A level, even so, the over expansion was weakened with 200 A–10 kHz.

中文翻译：

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脉冲电弧焊 Ti-6Al-4V 熔池温度监测与校准

摘要 利用红外图像研究了熔池的真实表面温度，旨在评估脉冲电弧焊的温度场。提出了标准黑体、熔池外热电偶、固相线和液相线温度的计算和标定算法。讨论了传统直流电弧和脉冲电弧之间的比较。结果证明，脉冲电弧有效地形成了具有更好圆度的熔池，并导致表面HAZ变窄。表面温度在 100A–10 kHz 时在熔池的大部分区域均匀分布，同时平均晶粒尺寸减小了 16.6%。脉冲电弧的影响是表面凝固的域。在 200 A 电平出现发散趋势，即使如此，在 200 A–10 kHz 时，过度膨胀减弱。