Abstract
In this study, the MB3 and AZ80 Mg alloys were welded by tungsten inert gas welding process with different filler wires. The influences of Al content in filler metal on weld morphologies, microstructure and mechanical performances were studied. Experimental results reveal that the seam width of joint increased with the improvement of welding current and pores occurred in the weld seam with excessive heat input. In the weld seam zone, a great deal of Mg17Al12 precipitated phases occurred owing to the Al element in filler wire, which resulted in the enhanced metallurgical bonding and the increased micro hardness. The maximum tensile strength of 208 MPa was obtained with optimal current of 80 A and AZ61 filler wire, representing an 85% joining efficiency relative to MB3 Mg alloy parent plate. And fracture occurred at weld seam zone, revealing the potential point of joint strength improvement.
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