Microstructure and Properties of Lap Joint Between Aluminum Alloy and Galvanized Steel by CMT

  • Song Niu
  • Su Chen
  • Honggang Dong
  • Dongsheng Zhao
  • Xiaosheng Zhang
  • Xin Guo
  • Guoqiang Wang


Lap joining of 1-mm-thick Novelist AC 170 PX aluminum alloy to 1.2-mm-thick ST06 Z galvanized steel sheets for automotive applications was conducted by cold metal transfer advanced welding process with ER4043 and ER4047 filler wires. Under the optimized welding parameters with ER4043 filler wire, the tensile shear strength of joint was 189 MPa, reaching 89% of the aluminum alloy base metal. Microstructure and elemental distribution were characterized by optical metalloscope and electron probe microanalysis. The lap joints with ER4043 filler wire had smaller wetting angle and longer bonded line length with better wettability than with ER4047 filler wire during welding with same parameters. The needle-like Al-Fe-Si intermetallic compounds (IMCs) were spalled into the weld and brought negative effect to the tensile strength of joints. With increasing welding current, the needle-like IMCs grew longer and spread further into the weld, which would deteriorate the tensile shear strength.


aluminum alloy cold metal transfer dissimilar metal joining galvanized steel 



This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51374048 and 50904012), the Fundamental Research Funds for the Central Universities (DUT13ZD209), and Science and Technology Foundation of Liaoning, China (No. 201301002).


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Copyright information

© ASM International 2016

Authors and Affiliations

  • Song Niu
    • 1
  • Su Chen
    • 1
  • Honggang Dong
    • 1
  • Dongsheng Zhao
    • 2
  • Xiaosheng Zhang
    • 3
  • Xin Guo
    • 3
  • Guoqiang Wang
    • 3
  1. 1.School of Materials Science and EngineeringDalian University of TechnologyDalianPeople’s Republic of China
  2. 2.School of Naval Architecture, Faculty of Vehicle Engineering and MechanicsDalian University of TechnologyDalianPeople’s Republic of China
  3. 3.Department of DevelopmentChina FAW Corporation LimitedChangchunPeople’s Republic of China

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