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MA Xiao, SUN Daqian, DUAN Zhenzhen, GU Xiaoyan, LI Hongmei. Effects of Cu on microstructures and properties of laser-MIG hybrid welded joint of steel/aluminum[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(12): 41-44.
Citation: MA Xiao, SUN Daqian, DUAN Zhenzhen, GU Xiaoyan, LI Hongmei. Effects of Cu on microstructures and properties of laser-MIG hybrid welded joint of steel/aluminum[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(12): 41-44.
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Effects of Cu on microstructures and properties of laser-MIG hybrid welded joint of steel/aluminum

  • 1.

    Key Laboratory of Automobile Materials of Ministry of Education, Jilin University, Changchun 130025, China

  • 2.

    College of Mechanical and Electrical Engineering, Changchun Institute of Technology, Changchun 130012, China

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  • Received Date: October 09, 2016
    Graphical Abstract
    • Abstract
  • Effects of Cu on microstructures and mechanical properties of laser-MIG hybrid welded joint of SYG960E ultra-high strength steel to 6061 aluminum were studied. The experimental results showed that compared with MIG welding, laser-MIG hybrid welding was beneficial to improve the weld appearance and welding quality. The interface layer of steel and aluminum has a double-layer structure consisting of needle-like FeAl3 intermetallic compound at aluminum side and strip-like Fe2Al5 intermetallic compound at steel side. The Cu has great effect on the interface layer and mechanical properties of steel-Al joints. When the Cu is added, the thickness of interface layer, the crack sensitivity and maximum micro-hardness of steel-Al joints will be decreased, and the tensile strength of steel-Al joints will be increased by 110%. It is related to that Cu can restrain the growth of interface layer and decrease the brittleness of Fe-Al intermetallic compounds in the interface layer. Therefore, the addition Cu is an effective way to improve the microstructures and mechanical properties of laser-MIG hybrid welded joints of ultra-high strength steel to aluminum.
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    • References (7)
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