Abstract
The quality of welded joints depends on the most optimal welding parameters and the selection of shielding gas type. The shielding gas was selected for joining stainless steels through gas metal arc welding methods by considering properties such as chemical-metallurgical interaction of shielding gas and the molten weld metal during the welding process, heat transmission capability of the gas and cost. In this study, the effect of different shielding gas combinations on the mechanical and microstructural properties of 316 austenitic stainless steel joined by the metal inert gas (MIG) welding method was investigated. In the welding process, pure argon (100 % Ar), 98.5 % Ar + 1.5 % H2 and 95 % Ar + 5 % H2 were used as shielding gases. Tensile, hardness, and bending tests were conducted to determine mechanical properties of the welded samples. In addition, metallographic examinations were carried out to detect the macrostructural and microstructural properties of weld zones. According to the results obtained from the study, the highest tensile strength was obtained from the joints welded using 100 % Ar shielding gas. When the addition of H2 into the Ar gas increased, the tensile strength of the welded samples decreased. As a result of the tensile test, fractures occurred in the base metal in all welded samples. In all welding parameters, the hardness of the weld metal was lower as compared to the heat affected zone (HAZ) and the base metal. As a result of the bending test, crack and tearing defects were found in the weld zone.
About the authors
İsmail Açar, born in 1983, received his BSc degree from Gazi University, Ankara, Turkey in 2006. He received his MSc degree in Science and Technology, Gazi University in 2013 and he continues his doctoral studies at the same university. His research interests include materials science, welding technology and weldability of metals.
Prof. Dr. Behçet Gülenç, born in 1959, received his PhD from Gazi University, Institute of Science and Technology, Ankara, Turkey in 1995. Currently, he is working as a Professor at Gazi University, Technology Faculty and Department of Metallurgy & Material Engineering. His research interest is focussed on materials science, mainly in the areas of welding technology and weldability of ferrous and nonferrous metals using advanced welding processes.
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