The weldability of magnesium alloys is an important field for research useful in industrial applications. The arc welding process with refractory electrode (tungsten) under an inert atmosphere (TIG) is one of the interesting techniques for producing high quality welds. The purpose of this work is to study the microstructural evolution of the different zones (ZF-ZAT-MB) of welded joints and their consequences on mechanical properties by microhardness measurements and tensile tests on the magnesium alloy AZ 31
