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Volume 42 Issue 3
Mar.  2016
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Journal of Beijing University of Aeronautics and Astronautics  > 2016  >  42(3): 452-458.
YANG Zhou, QI Bojin, YANG Mingxuanet al. Surface temperature distribution of molten pool by ultra high frequency pulsed GTAW[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(3): 452-458. doi: 10.13700/j.bh.1001-5965.2015.0155(in Chinese)
Citation: YANG Zhou, QI Bojin, YANG Mingxuanet al. Surface temperature distribution of molten pool by ultra high frequency pulsed GTAW[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(3): 452-458. doi: 10.13700/j.bh.1001-5965.2015.0155(in Chinese)
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Surface temperature distribution of molten pool by ultra high frequency pulsed GTAW

doi: 10.13700/j.bh.1001-5965.2015.0155

  • School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

Funds:  National Natural Science Foundation of China (51405007);the Fundamental Research Funds for the Central Universities (YWF-14-JXXY-008)
  • Received Date: 19 Mar 2015
  • Publish Date: 20 Mar 2016
    Abstract
  • Thermal observation of molten pool was carried out with Ti-6Al-4V plates (with thickness of 5 mm). The molten pool surface temperature distribution of ultra high frequency pulsed gas tungsten arc welding (UHFP-GTAW) was collected and analyzed by infrared imaging monitor. Compared with conventional GTAW (C-GTAW), the test results indicate that the surface temperature of molten pool center increases by 10-30 K with UHFP-GTAW(20 kHz, 40 kHz) after heating the base metal 20 seconds; meanwhile, the areas of the elevated temperature distribution were measured referring to varying temperature (678 K,823 K,968 K), which are reduced by the range of 13%-30%. A two-dimensional numerical model of molten pool was established, considering the essential factors such as heat flux, force and mixed heat transfer, to explore the characteristics of the temperature distribution in the molten pool. The calculated results of the above model are basically consistent with the test data.

     

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