How ultra high frequency of pulsed gas tungsten arc welding affects weld porosity of Ti-6Al-4V alloy

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• 作者：Mingxuan Yang (1)
  Zhou Yang (1)
  Baoqiang Cong (1)
  Bojin Qi (1)
  
  1. Department of Materials Processing ; Beijing University of Aeronautics and Astronautics ; Xueyuan Road No. 37 ; Haidian District ; Beijing ; China ; 100191
  
• 关键词：Ultra high frequency pulsed welding ; Weld porosity ; Molten pool ; Titanium alloy
• 刊名：The International Journal of Advanced Manufacturing Technology
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：76
• 期：5-8
• 页码：955-960
• 全文大小：919 KB
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• 刊物类别：Engineering
• 刊物主题：Industrial and Production Engineering
  Production and Logistics
  Mechanical Engineering
  Computer-Aided Engineering and Design
  
• 出版者：Springer London
• ISSN：1433-3015

文摘

Ultra high frequency of pulsed gas tungsten arc welding (UHFP-GTAW) has been considered as a promising method to improve weld quality of titanium alloys. This paper studies the effect of UHFP-GTAW on weld porosity of Ti-6Al-4V alloy, which shows how liquid pressure/viscosity/temperature of molten pool influences nucleation, growth, detaching, and escaping of gas pore. Results indicated that compared to conventional GTAW, the liquid pressure and curvature radius of the gas pore were increased significantly while viscosity and filtration angle of the gas pore reduced simultaneously caused by UHFP-GTAW, leading to high escaping speed and easy detaching process of the weld gas pore. It is suggested that the elimination of weld porosity of Ti-6Al-4V alloy can be achieved by UHFP-GTAW process.