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The application of nanotechnology in the welding process has great importance in developing the mechanical properties of welding joints. The aim of this paper was to investigated the effect of addition titanium dioxide nanoparticles(TiO 2 ) to welding joints by using cold spary technique and study the possibility of improving the impact toughness of the welding joint and increase its operation life. Three weight fraction are used of TiO 2  (0.75%, 1.5%, and 2%).The results showed there are improvements in the Impact toughness of welded joints with an increase of TiO 2  concentrations. The average Impact toughness for the welded sample without TiO 2  was (162.4 J), while the average Impact toughness for the welded sample with (1.5) % TiO 2  NPs. was (231.2 J) at increasing ratio of (42.36 %) due to the good toughness properties of TiO 2  that increase the toughness of welding zone. The Microstructure image by SEM showed that the addition of TiO 2  decreases the grain size in the welding zone and makes it more homogeneous, which gives it more toughness. The EDS analysis shows that increase TiO 2  NPs leads to increase the amount of Ti  and decrease the amount of Mn, and Si.

Effect of adding TiO 2 nanoparticles on the impact toughness for welding joints of mild steel