Effect of adding TiO₂ nanoparticles on the impact toughness for welding joints of mild steel

ABSTRACT

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(TiO₂) 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 TiO₂ (0.75%, 1.5%, and 2%).The results showed there are improvements in the Impact toughness of welded joints with an increase of TiO₂ concentrations. The average Impact toughness for the welded sample without TiO₂ was (162.4 J), while the average Impact toughness for the welded sample with (1.5) % TiO₂ NPs. was (231.2 J) at increasing ratio of (42.36 %) due to the good toughness properties of TiO₂ that increase the toughness of welding zone. The Microstructure image by SEM showed that the addition of TiO₂ decreases the grain size in the welding zone and makes it more homogeneous, which gives it more toughness. The EDS analysis shows that increase TiO₂ NPs leads to increase the amount of Ti  and decrease the amount of Mn, and Si. 

KEYWORDS:

• Mild steel
• arc welding
• TiO₂ nanoparticles
• nano welding
• impact toughness

Acknowledgments

The authors would like to acknowledge the assistance offered by the Nanotechnology and Advanced Materials Research Unit (NAMRU) and Laboratories of Mechanical Engineering Department at the Faculty of Engineering University of Kufa/IRAQ. And the authors are thankful for the mechanical workshop in Kufa cement plant/IRAQ.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Ali Sadiq AlIthari

Ali Sadiq AlIthari had PhD in Mechanical Engineering /Applied Mechanics ,M.Sc. in Material Engineering , Work as Head of mechanical Engineering Department for 6 years , and work as Dean of faculty of Engineering /University of Kufa /IRAQ  for last two years ago. 

Sabah Mresen Thahab

Sabah Mresen Thahab had PhD in Physical Science/ Solid state physics From UPM University  in Malysia , ,M.SC. in physics Science, work as head of Nano Materials and smart materials Center in University of Kufa /IRAQ.

Ali Fakhri Al-Obbaidi

Ali Fakhri AlObaidi had B.Sc. in Mechanical Engineering/University of Kufa, Had M.Sc. In mechanical Engineering/Applied Mechanics, Work as Maintenance engineer in Kufa Cement plant/ Iraqi Cement Company .