Investigation on effects of process parameters on porosity in dissimilar Al alloy lap fillet welds

被引：15

作者：

Liu, Wen ^{[1
]}

Wang, Hui-Ping ^{[2
]}

Lu, Fenggui ^{[1
]}

Cui, Haichao ^{[1
]}

Tang, Xinhua ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Shanghai Key Lab Mat Laser Proc & Modificat, Sch Mat Sci & Engn, Shanghai 200030, Peoples R China

[2] GM Global R&D, Mfg Syst Res Lab, Warren, MI USA

来源：

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY | 2015年 / 81卷 / 5-8期

基金：

中国国家自然科学基金;

关键词：

Dissimilar Al alloys; Lap fillet joints; Porosity; Shielding gas; Torch angle; MECHANICAL-PROPERTIES; ALUMINUM-ALLOYS; MICROSTRUCTURE; JOINT;

D O I：

10.1007/s00170-015-7276-y

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

Cast and wrought aluminum (Al) alloys are used in making vehicle structure components due to their light weight and good mechanical properties. In this paper, pulsed gas metal arc welding (P-GMAW) was employed to weld lap fillet joints between cast A356 and wrought 7003 Al alloy. The effect of torch angles and shielding gases on weld porosity distribution, and morphology was investigated. It was found that decreasing the torch angle helped in reducing porosity, which was explained by molten pool shape captured in high-speed camera. Addition of helium (He) into the shielding gas decreased the porosity in weld joints due to the increase of arc temperature that improved the welding heat input, especially with argon (Ar) + He + CO2 gas mixture.

引用

页码：843 / 849

页数：7

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