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Improving Impact Toughness for Welding Joints of Steel by Adding TiO₂ Nanoparticales

Ali Fakhri Al-Obaid, Ali Sadiq Yasir, Sabah Mresn Thahab

The using of nanotechnology in the welding process has great importance in developing the mechanical properties of welding joints for metals. This paper investigated the effect of addition TiO₂ NPs to welding joints to improving the Impact toughness property of the welding joints. The cold spray coating method of the nanoparticles are used to adding the TiO₂ NPs to the welding joints during the welding process. Three weight fraction are used for TiO₂ NPs (0.75%, 1.5%, and 2%). The testing samples were prepared for Impact test, and microstructure by SEM. The results show the increasing in Impact toughness of welded joints with an increase of TiO₂ NPs concentrations. The average Impact toughness for the welded sample without TiO₂ NPs. was (162.4 J), while the average Impact toughness for the welded sample with (1.5)% TiO₂ NPs. was (231.2 J) with improving rate of (42.36%). The Microstructure images by SEM show the adding of TiO₂ NPs decreases the grain size and homogenous region in welded joints cross-section compared with a sample without adding TiO₂ NPs. The EDS analysis show that increase Ti contain and decrease (Mn and Si) contain with increase TiO₂ NPs.