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Abstract

The experimental investigation was carried out to study the weld microstructure of resistance spot welding of AZ31 Mg alloy 1 mm thick. A fine and homogeneous non-equilibrium microstructure of globular α grains, surrounded by eutectic mixtures of α and β (Mg₁₇Al₁₂), was achieved. The thermal–electrical–mechanical analysis model was employed to simulate the thermal history and the temperature gradient. It was found that a combination of the welding conditions and the particular thermophysical properties of the AZ31Mg alloy established a uniform temperature distribution throughout the weld pool and this thermal condition is ideal for nucleation throughout the melt metal and equiaxed grain structure forming.

Keywords

MICROSTRUCTURE TEMPERATURE GRADIENT MG ALLOY RESISTANCE SPOT WELDING FEM SIMULATION

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Microstructure characteristics of resistance spot welds of AZ31 Mg alloy

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