Abstract: It has become the developing trend that the aluminum/steel integrated structure will replace the single steel structure in automotive industry because of the lightweight demand of automobiles. However, the poor metallurgical compatibility between aluminum and steel makes it hard for conventional welding technique to achieve effective connection between them. For the sake of solving this critical problem, laser welding experiments of automotive 6016 aluminum alloy thin sheets and DC06 low carbon steel were carried out by a fiber laser, in which a steel-on-aluminum overlapped configuration was adopted. Furthermore, the interface microstructure and mechanical properties of Al alloy/steel laser welded joints were investigated by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffractometer and tensile testing machine. Accor-ding to the experimental results, under the condition that the laser power (P) was 1 000 W, welding speed (V) was 0.05 m/s, defocusing distance (f) was +1 mm, and protective gas was high purity Ar gas with a flow rate of 20 L/min, the weld center Al alloy/steel joint consisted of a large amount of ferrite and pearlite, the Al alloy/steel joint held a maximum average tensile shear strength of 94.2 N/mm, and the joint exhibited a mixed fracture mode of toughness and quasi-cleavage. Meanwhile, a certain amount of brittle intermetallic compounds (IMC) formed at the interface of Al alloy/steel joints, mainly consisting of FeAl2, FeAl, and FeAl3 phases.
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2020, Vol. 34 
