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Comparative Study of Laser-Arc Hybrid Welding for AA6082-T6 Aluminum Alloy with Two Different Arc Modes

1
Department of technical engineering, CRRC Qingdao Sifang Co., Ltd., Qingdao 266111, China
2
School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China
*
Author to whom correspondence should be addressed.
Metals 2020, 10(3), 407; https://doi.org/10.3390/met10030407
Received: 2 March 2020 / Revised: 18 March 2020 / Accepted: 19 March 2020 / Published: 22 March 2020
The effects of arc modes on laser-arc hybrid welding for AA6082-T6 aluminum alloy were comparatively studied. Two arc modes were employed: pulsed metal inert gas arc and cold metal transfer arc. The results indicated that joints without porosity, undercutting, or other defects were obtained with both laser-pulsed metal inert gas hybrid welding (LPMHW) and laser-cold metal transfer hybrid welding (LCHW). Spatter was reduced, and even disappeared, during the LCHW process. The sizes of equiaxed dendrites and the width of the partially melted zone in the LPMHW joint were larger than those in the LCHW joint. The microhardness in each zone of the LPMHW joint was lower than that of the LCHW joint. The softening region in the heat-affected zone of the LPMHW joint was wider than that of the LCHW joint. The tensile strength of the LCHW joint was higher than that of the LPMHW joint. For the two joints, the fractures all occurred in the softening region in the heat-affected zone, and the fracture morphologies showed ductile fracture features. The dimples in the fractograph of the LCHW joint were deeper than those of the LPMHW joint. View Full-Text
Keywords: laser-arc hybrid welding; arc mode; aluminum alloy; microstructure; mechanical property laser-arc hybrid welding; arc mode; aluminum alloy; microstructure; mechanical property
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MDPI and ACS Style

Han, X.; Yang, Z.; Ma, Y.; Shi, C.; Xin, Z. Comparative Study of Laser-Arc Hybrid Welding for AA6082-T6 Aluminum Alloy with Two Different Arc Modes. Metals 2020, 10, 407.

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