Abstract
The oscillating laser welding (OLW) can improve the weld microstructure and the mechanical properties of the welded joints, which greatly improves the quality of laser welding. In this paper, a macro-micro coupling model for investigating the microstructure evolution process in the OLW of 6061 aluminum alloy is developed. The dynamic solidification conditions (SCs) and flow field are considered in the model. The microstructure evolution process under the effect of the oscillating laser beam is analyzed and discussed in detail based on the calculated results. The obtained weld cross section and microstructure morphology results agree well with the experimental results, which proves the validity of the developed model. It is found that the microstructure morphology is significantly influenced by the dynamic temperature gradient (TG) and solidification rate (SR). The solute concentration distribution is changed by the flow field, which affects the microstructure evolution process. The results demonstrate that the developed model is efficient for refining weld microstructure and hence improving mechanical properties of the welded joints.
Published Version
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