The Impact of Resistance Spot Welding Time and Medium on the Microstructure and Mechanical Properties of AISI 201 Stainless Steel Welded Joints

Document Type : Research articles

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Department of Mechanical Engineering, Faculty of Engineering at Shoubra, Benha University, Cairo, Egypt

Abstract

In this article, resistance spot welding technique was carried out on low nickel high manganese stainless-steel, AISI201 lab joints. The main objective is to study the effect of welding time within different shielding medium on the resistance spot welded joints of AISI201 stainless-steel. The welding process was carried out at a constant electrode pressure and current while welding time and shielding medium were variable. The microstructure, Bonding shear load, and hardness were evaluated for the welded joints. The result showed that when time increased, the shear force increased. The best Bonding shear load of 9.52KN was achieved at 26cycle, in nitrogen medium. As it is higher than the obtained values of shear load in the presence of argon and air about 4%, and 6%, respectively. As argon is an inert gas, it works as a shield gas that protects the welding area from the atmosphere, which improves the mechanical properties. Considering nitrogen, as longer is the welding time, it gives more opportunity for nitrogen to be in one of two forms: the first is the formation of nitrides, and the second is the formation of solid solution as an interstitial atom. the nitrogen in these two cases prevents dislocation movement during the deformation, so the presence of nitrogen increases strength. The microstructure analysis revealed that an increase in time generates more heat input that led to coarsening in grains. It was noted that, the defect was very small at 26cycle in the two cases the presence of argon and nitrogen.

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Engineering Research Journal (Shoubra)
Volume 54, Issue 1
January 2025
Pages 339-344

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