Effect of beam defocusing on porosity formation in laser-MIG hybrid welded TA2 titanium alloy joints
[Display omitted] The influence of defocusing distance on porosity formation during laser-MIG hybrid welding of TA2 titanium alloy joints was studied by both experimental and numerical methods. The experimental results showed that the population of porosities decreased in the welded joint when the d...
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| Published in: | Journal of manufacturing processes Vol. 58; pp. 1221 - 1231 |
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| Main Authors: | , , , , , , |
| Format: | Journal Article |
| Language: | English |
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Elsevier Ltd
01-10-2020
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| Abstract | [Display omitted]
The influence of defocusing distance on porosity formation during laser-MIG hybrid welding of TA2 titanium alloy joints was studied by both experimental and numerical methods. The experimental results showed that the population of porosities decreased in the welded joint when the defocusing distance increased from +6 mm to +12 mm, while other welding parameters remained unchanged. A volume of fluid (VOF) model was built in FLUENT by coupling the laser induced keyhole, MIG droplet and melt pool. The simulation results suggested the formation of porosities can be attributed to the collapse of the keyhole that can trap the open space at its bottom, thanks to the vigorous laser-material interaction. When the defocusing distance increases, the laser energy density drops and the keyhole becomes shallower leading to a weaker liquid metal vortex flow. In this case, the open space at the bottom of the keyhole could be backfilled with the surrounding liquid metal when the keyhole collapse, resulting in less porosity in the solidified weld. |
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| AbstractList | [Display omitted]
The influence of defocusing distance on porosity formation during laser-MIG hybrid welding of TA2 titanium alloy joints was studied by both experimental and numerical methods. The experimental results showed that the population of porosities decreased in the welded joint when the defocusing distance increased from +6 mm to +12 mm, while other welding parameters remained unchanged. A volume of fluid (VOF) model was built in FLUENT by coupling the laser induced keyhole, MIG droplet and melt pool. The simulation results suggested the formation of porosities can be attributed to the collapse of the keyhole that can trap the open space at its bottom, thanks to the vigorous laser-material interaction. When the defocusing distance increases, the laser energy density drops and the keyhole becomes shallower leading to a weaker liquid metal vortex flow. In this case, the open space at the bottom of the keyhole could be backfilled with the surrounding liquid metal when the keyhole collapse, resulting in less porosity in the solidified weld. |
| Author | Tian, Yingtao Luo, Shixuan Li, Ruifeng Chen, Shuling Geng, Hui Yu, Hang Xu, Guoxiang |
| Author_xml | – sequence: 1 givenname: Shuling surname: Chen fullname: Chen, Shuling email: chensl@just.edu.cn organization: School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, PR China – sequence: 2 givenname: Shixuan surname: Luo fullname: Luo, Shixuan organization: School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, PR China – sequence: 3 givenname: Hang surname: Yu fullname: Yu, Hang organization: School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, PR China – sequence: 4 givenname: Hui surname: Geng fullname: Geng, Hui organization: School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, PR China – sequence: 5 givenname: Guoxiang surname: Xu fullname: Xu, Guoxiang organization: School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, PR China – sequence: 6 givenname: Ruifeng surname: Li fullname: Li, Ruifeng organization: School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, PR China – sequence: 7 givenname: Yingtao orcidid: 0000-0002-3602-259X surname: Tian fullname: Tian, Yingtao email: y.tian12@lancaster.ac.uk organization: Department of Engineering, Lancaster University, Bailrigg, Lancaster, LA1 4YW, UK |
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The influence of defocusing distance on porosity formation during laser-MIG hybrid welding of TA2 titanium alloy joints was studied by both... |
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| Title | Effect of beam defocusing on porosity formation in laser-MIG hybrid welded TA2 titanium alloy joints |
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