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Comparative Study on Welding Characteristics of Laser-CMT and Plasma-CMT Hybrid Welded AA6082-T6 Aluminum Alloy Butt Joints

by Zhibin Xin 1, Zhibin Yang 1,2,*, Han Zhao 1 and Yuxin Chen 1
1
School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China
2
Engineering Department of CRRC Sifang Co., Ltd, Qingdao, Shandong 266111, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(20), 3300; https://doi.org/10.3390/ma12203300
Received: 18 September 2019 / Revised: 29 September 2019 / Accepted: 9 October 2019 / Published: 11 October 2019
Laser-CMT (Cold Metal Transfer) and plasma-CMT hybrid welding are two promising alternative joining technologies for traditional Metal-Inert-Gas (MIG) welding of the aluminum alloy joints in the high speed trains manufacturing industry. In this work, a comparative study on the weld formation, microstructure, micro-hardness, and mechanical properties of the butt joints in the two welding methods was conducted. The results indicate that the overall quality of the laser-CMT and plasma-CMT welds were good, especially of the laser-CMT hybrid weld, and the laser-CMT hybrid welding process needed a lower heat input. The width of the partially melted zone of the laser-CMT hybrid weld was narrower than that in the plasma-CMT hybrid weld. Micro-hardness test results show that two distinct softening regions were identified in the heat affected zone, and the micro-hardness values of each zone in the laser-CMT hybrid weld were lower than that in the plasma-CMT hybrid weld. The tensile strength of the laser-CMT hybrid welded joints was higher than that of the plasma-CMT hybrid welded joints, which could reach up to 79.4% and 73.7% of the base materials, respectively. All the fractures occurred in the softening region and exhibited a ductile shear fracture with a shear angle of approximately 45°. The fractographs manifested that the laser-CMT and plasma-CMT hybrid welded joints presented ductile fracture and ductile-brittle fracture features, respectively. View Full-Text
Keywords: laser-CMT hybrid welding; plasma-CMT hybrid welding; aluminum alloy; microstructure; mechanical property laser-CMT hybrid welding; plasma-CMT hybrid welding; aluminum alloy; microstructure; mechanical property
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Xin, Z.; Yang, Z.; Zhao, H.; Chen, Y. Comparative Study on Welding Characteristics of Laser-CMT and Plasma-CMT Hybrid Welded AA6082-T6 Aluminum Alloy Butt Joints. Materials 2019, 12, 3300.

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