from the conferences organized by TANGER Ltd.
<div>In the present research the microstructure and mechanical properties of TIG welded AA6061 Al alloy utilizing TiO2 containing filler metal were investigated via microscopic observation, microhardness measurement and tensile test evaluation. For this purpose, spray method was used to make various TiO2 containing filler metal with 0.5 and 1.5 wt% TiO2 nano particles. The size of the TiO2 nanoparticles were 50 nm in average. The optical microscopic results showed that increase of TiO2 nanoparticles in filler metal have significant effect on refinement of FZ microstructure. The mean grain size of TiO2 free and containing 1.5 wt% TiO2 samples were 65 µm and 38 µm respectively. The microhardness test was conducted to demonstrate the effect of TiO2 on the hardness of different zones of welded specimens. The results showed that increase in TiO2 nanoparticle in FZ results to higher FZ hardness due to grain refinement and composite effect of TiO2 nanoparticles. The HAZ softening also were observed in all samples. The ultimate tensile strength of FZ was measured utilizing tensile test examination. The results showed that with increasing TiO2 in the FZ, the tensile strength of this region increased. The tensile strength of TiO2 free and containing 0.5 and 1.5 wt% of TiO2 were 185, 200 and 215 MPa respectively.</div>
Keywords: AA6061 aluminium alloy, TIG, TiO2, microstructure, mechanical properties© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.