Mechanical properties of welded joints in vertical-up variable polarity plasma arc welding of 2219 aluminum alloy

来源期刊：中国有色金属学报(英文版)2005年第z2期

论文作者：杨春利 郭立杰 林三宝 沈鸿源

文章页码：83 - 86

Key words：2219 aluminum alloy； variable polarity plasma arc welding； mechanical property； microstructure

Abstract: The mechanical properties of the 2219 aluminum alloy welded joints by vertical-up variant polarity plasma arc welding (VPPAW) with keyhole were analyzed. The tensile strength of welded joints can reach 55% of that of base metal. The microstructure of weld joints was studied to explain the mechanical properties of the weld. The results show that the intensity of weld center is less than that of HAZ, and the intensity of weld center is the worst. So an advanced welding procedures is presented to reduce the heat input and increase the welding speed. The results in this procedures show that the tensile strength of welded joints reaches more than 60% of that of the parent metal, and the specific elongation does not descend.