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The study of microstructure and mechanical properties of Ti6Al4V/MB3 metallurgical joint by tungsten inert gas welding-brazing process

MB3 Mg alloy and Ti6Al4V alloy were joined by tungsten inert gas (TIG) welding-brazing process with AZ91 filler. The microstructures and mechanical properties of Ti-Mg weld were analyzed by optical metalloscope, scanning electron microscope and universal testing machine. Results reveal that Ti-Mg dissimilar alloys were successfully joined by TIG welding-brazing process. A Ti-Al intermetallic compound layer formed at the brazing area, and grain coarsening accompanied with Mg17Al12 precipitates occurred in the fusion area. The former is the key to realize the reliable joining of Ti-Mg, whereas the latter is the week point of whole joint. Besides, under optimized welding parameter of 65 A, the maximum mechanical property of 202 N mm−1 was obtained and fracture location was at the fusion area.