Browsing by Author "Talabi, S. I."
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Item Effect of welding variables on mechanical properties of low carbon steel welded joint(Production Engineering Institute (PEI), Faculty of Mechanical Engineering, University of Maribor, Slovania, 2014) Talabi, S. I.; Owolabi, O. B.; Adebisi, J. A.; Yahaya, T.This paper discussed the effect of welding variables on the mechanical prop-erties of welded 10 mm thick low carbon steel plate, welded using the Shield-ed Metal Arc Welding (SMAW) method. Welding current, arc voltage, welding speed and electrode diameter were the investigated welding parameters. The welded samples were cut and machined to standard configurations for tensile, impact toughness, and hardness tests. The results showed that the selected welding parameters had significant effects on the mechanical properties of the welded samples. Increases in the arc voltage and welding current resulted in increased hardness and decrease in yield strength, tensile strength and impact toughness. Increasing the welding speed from 40-66.67 mm/min caused an increase in the hardness characteristic of the welded samples. Initial decrease in tensile and yield strengths were observed which thereafter increased as the welding speed increased. An electrode diameter of 2.5 mm provided the best combination of mechanical properties when compared to the as received samples. This behaviour was attributed to the fact that in-creased current and voltage meant increased heat input which could create room for defect formation, thus the observed reduced mechanical properties.Item Effect of welding variables on mechanical properties of low carbon steel welded joint(Production Engineering Institute (PEI), Faculty of Mechanical Engineering, University of Maribor, Slovania, 2014) Talabi, S. I.; Owolabi, O. B.; Adebisi, J. A.; Yahaya, T.This paper discussed the effect of welding variables on the mechanical prop-erties of welded 10 mm thick low carbon steel plate, welded using the Shield-ed Metal Arc Welding (SMAW) method. Welding current, arc voltage, welding speed and electrode diameter were the investigated welding parameters. The welded samples were cut and machined to standard configurations for tensile, impact toughness, and hardness tests. The results showed that the selected welding parameters had significant effects on the mechanical properties of the welded samples. Increases in the arc voltage and welding current resulted in increased hardness and decrease in yield strength, tensile strength and impact toughness. Increasing the welding speed from 40-66.67 mm/min caused an increase in the hardness characteristic of the welded samples. Initial decrease in tensile and yield strengths were observed which thereafter increased as the welding speed increased. An electrode diameter of 2.5 mm provided the best combination of mechanical properties when compared to the as received samples. This behaviour was attributed to the fact that in-creased current and voltage meant increased heat input which could create room for defect formation, thus the observed reduced mechanical properties.Item Stress corrosion cracking of austenitic stainless steels in chloride environment(Faculty of Engineering, Ahmadu Bello University, Zaria, Nigeria, 2015) Ahmed, I. I.; Alabi, A. G. F.; Odusote, J. K.; Aremu, I. N.; Adebisi, J. A.; Yahaya, T.; Talabi, S. I.; Yahya, R. A.; Lyon, S. B.This study was carried out to assess the effect of applied potentials on Stress Corrosion Cracking (SCC) of Austenitic Stainless Steels (ASS), Type 304L in a potentiostatically controlled chloride environment at ambient temperature. The stress corrosion cracking tests were carried out on annealed ASS using a Slow Strain Rate Test (SSRT) technique in sodium chloride solution acidified with hydrochloric acid at ambient temperature. Analyses of failed specimens were carried out using optical microscope. The study showed that plastic elongation, ultimate tensile strength and time to failure decrease as the applied potential increases during the slow strain rate test. The study showed that immunity of ASS to chloride SCC was improved when the electrochemical potential was maintained in the primary passive potential range. Analysis of failed samples showed evidences of SCC.