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

被引：33
|
作者：
Yang, Mingxuan [1 ]
Yang, Zhou [1 ]
Cong, Baoqiang [1 ]
Qi, Bojin [1 ]
机构：
[1] Beijing Univ Aeronaut & Astronaut, Dept Mat Proc, Beijing 100191, Peoples R China
来源：
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY | 2015年 / 76卷 / 5-8期
基金：
中国国家自然科学基金;
关键词：
Ultra high frequency pulsed welding; Weld porosity; Molten pool; Titanium alloy; TITANIUM;
D O I：
10.1007/s00170-014-6324-3
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
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.
引用
收藏
页码：955 / 960
页数：6
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