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Experimental Investigation of the Effect of Spot-Welding Process Parameters on the Tensile Strength of Similar Metal Joints


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DOI: https://doi.org/10.15866/ireme.v15i2.20221

Abstract


Resistance spot welding is commonly used in the automotive industry due to the advantage of high-speed, the high-production assembly lines, and the suitability for automation. The spot-welded joints are usually exposed to shear and tensile loads during the services, and hence these service conditions lead to the rupture of the welded joint. In this study, the effect of welding process parameters on the ultimate tensile strength and micro hardness of the AISI 304 stainless steel resistance spot welded joints are studied. Three welding parameters with three levels are used in the experimental work as welding power (current), sheet thickness, and welding time. Resistance spot welding quality mainly depends on the welding parameters. Therefore, the selection of optimal parameter levels plays an important role in the quality of the welded joints. In this research work, Surface Response Method (SRM) has been used to determine significant process parameters and their levels for optimal ultimate tensile strength and micro hardness reported and nugget diameter. SRM based L15 orthogonal array is selected for experimentation. Experiments are carried out on austenitic stainless-steel grade AISI304. The level of importance of the welding parameters on the tensile strength and micro hardness is determined by analysis of variance (ANOVA) using Minitab 17 software. The tensile test, microstructure, and Vickers hardness test have been used to evaluate the welded joints. The main findings of this study have eben that the tensile strength decreases with increasing the welding current or welding time or both, whereas the MHV increases slightly with increasing of both the thickness and on-time duration. Furthermore, nugget diameter increases with increasing the welding time.
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Keywords


Resistance Spot Welding; Response Surface Method; ANOVA

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References


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