Impact of fast-frequency pulsed current wave on microstructure and mechanical performances of 1060 Al alloy welded by FFP-VPTIG

A novel welding current waveform has been designed to address the defects of pores and insufficient mechanical performances of 1060-Al alloy welded by conventional variable polarity tungsten inert gas welding (VPTIG). This waveform superimposes fast-frequency pulsed (FFP) current onto the convention...

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Bibliographic Details
Published in:Journal of manufacturing processes 2024-08, Vol.124, p.248-260
Main Authors: Wang, Zhenmin, Zhu, Zeguang, Wang, Yuhai, Gui, Zixiao, Jiang, Donghang, Wu, Jianwen, Zhang, Long, Jin, Lin, Tian, Jiyu, Wu, Xiangmiao, Zhang, Qin
Format: Article
Language:English
Subjects:
1060-Al alloy
FFP-VPTIG
Mechanical performance
Microstructure
Porosity
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Summary:A novel welding current waveform has been designed to address the defects of pores and insufficient mechanical performances of 1060-Al alloy welded by conventional variable polarity tungsten inert gas welding (VPTIG). This waveform superimposes fast-frequency pulsed (FFP) current onto the conventional VPTIG current. The 1060-Al alloy plates (thicknesses 6 mm) were surface welded with conventional VPTIG and FFP-VPTIG by a self-designed FFP-VPTIG welding power source. An investigation was conducted to compare the effects of the amplitude and frequency of the FFP current on the microstructure and mechanical performances of welds. The findings indicate that the FFP-VPTIG weldments exhibited a remarkable 24.2% enhancement in weld penetration, attributed to the arc contraction effect and molten pool stirring effect of the FFP current, in contrast to the weldments produced by conventional VPTIG. The porosity had a maximum decline of 83.4%, while the average grain size showed a maximum decrease of 13.20%. Additionally, the tensile strength showed a maximum increase of 7.71%, and the elongation reached a maximum accumulation of 16.74%. The surface and cross-sectional porosity ratio of FFP-VPTIG weldments did not exceed 2%, complying with the optimum level set by the international standard ISO-10042. Notably, this thesis provides an essential reference for further improving the efficiency of the conventional VPTIG welding process and optimizing the porosity of Al alloy weldments.
ISSN:1526-6125
2212-4616
DOI:10.1016/j.jmapro.2024.05.053