Abstract
This paper investigates the laser welding process of dissimilar Aluminum-Magnesium materials. A three-dimensional transient model has been developed using the 'Ansys-fluent' software to study the transport phenomenon in the weld bead. The results show the formation of a heterogeneous mixture in the molten pool. The transport phenomenon is strongly influenced by convection, thermal and mass diffusivities during laser beam welding. Microhardness tests show that the mechanical properties of welded joint are affected by the formation of brittle intermetallic phases in the Al-Mg transition zone, which is the main cause of weld cracking. The formation of intermetallic phases in the melting zone was highlighted. The layer thicknesses of intermetallic compounds, comprising Al3Mg2 and Al12Mg17 phases were determined numerically by studying the distribution of chemical elements in the weld pool. The results of the numerical simulation are in good agreement with the corresponding experimental results.
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