Research on the Microstructure Characteristic and Tensile Property of Laser‑MIG Hybrid Welded Joint for 5A06 Aluminum Alloy

Yanqiu Zhao; Xiaohong Zhan; Qiyu Gao; Shuai Chen; Yue Kang

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자료유형: 학술저널

저자정보: Yanqiu Zhao (Nanjing University of Aeronautics and Astronautics) Xiaohong Zhan (Nanjing University of Aeronautics and Astronautics) Qiyu Gao (Nanjing University of Aeronautics and Astronautics) Shuai Chen (Nanjing University of Aeronautics and Astronautics) Yue Kang (Nanjing University of Aeronautics and Astronautics)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.26 No.3

발행연도: 2020.1

수록면: 346 - 359 (14page)

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Laser-metal inter gas (MIG) hybrid welding technique provides higher overall productivity over the traditional fusionwelding processes for joining medium-thick aluminum alloy. In this paper, laser-MIG hybrid welding experiment was performedby the TruDisk 12003 Laser and KUKA robot. The second fusion line, the laser-dominated region and laser-MIGhybrid-dominated region were introduced to this study to discuss the microstructure distribution. A three-dimensionalfinite element model was established by MSC. Marc to study the thermal field distribution of laser-MIG hybrid weldingprocess. It found that the temperature in the laser-MIG hybrid-dominated region was much higher than the laser-dominatedregion. The formation of the second fusion line in the welded joint is mainly owing to the different heat effect of laser-archybrid-dominated region and laser-dominated region. The crystalline size of equiaxed dendrite grains in the laser-MIGhybrid-dominated region is finer than the laser-dominated region. In addition, the tensile property was measured to dissectthe failure mechanism of the laser-MIG hybrid welding joints. The element content in fractured surface at the position ofdimple and pore wall were comprehensively analyzed. The element content of Mg and O in pore wall are higher than dimple. In the solidification process, the growth of equiaxed dendrite grains is in part hindered by the existence of coarse pores inthe laser-MIG hybrid-dominated region.

#Aluminum alloy · Dendrite · The second fusion line · Laser-MIG hybrid welding · Simulation

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