Abstract
Laser-arc hybrid welding (LAHW) was employed to improve the tensile properties of the joints of 8-mm-thick Al-Mg-Si-Mn alloy (AA6082) using Al-5Mg filler wire. The weld microstructures were examined by scanning electron microscope, electron backscattered diffraction, and transmission electron microscopy in detail. The LAHW joints with pore-free and high-tensile performances were obtained. The strength enhancement of the fusion zone and heat-affected zone in the LAHW joint was mainly attributed to the grain refinement strengthening and the precipitation strengthening, respectively. The microstructure characteristics were related to the effects of laser-arc interaction on the energy transfer within the molten pool. The arc caused the majority of laser energy to dissipate out of the keyhole, and then it reduced the heat input. The lower heat input refined the grain size, weakened the overaging effect, and thus improved the tensile strength.
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Acknowledgments
The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China with Grant No. 51275186, the Postdoctoral Science Foundation of China with Grant No. 2015M572138, and the National Science & Technology Major Project of China with Grant No. 2013ZX04001101.
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Zhang, C., Gao, M., Jiang, M. et al. Effect of Weld Characteristic on Mechanical Strength of Laser-Arc Hybrid-Welded Al-Mg-Si-Mn Aluminum Alloy. Metall Mater Trans A 47, 5438–5449 (2016). https://doi.org/10.1007/s11661-016-3697-y
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DOI: https://doi.org/10.1007/s11661-016-3697-y