Development of Mathematical Model for Resistance Spot Weld of dissimilar Metal Sheet using ‘R’ Programming

Abstract

The growing demand for lightweight vehicle body structures often necessitates the use of dissimilar metals with varying thicknesses. Welding these dissimilar metals together poses a challenge due change in different type of properties. This paper aims to study the effect of welding parameters on the weld strength and quality. Spot-welding experiments were conducted using the Central Campsite Design Matrix for the combination of mild steel and 304L SS sheets of different thickness. The investigation was carried out to study the influence of weld current, weld time, and weld force on the strength of dissimilar metal welds. An empirical relation is developed using R-language to predicts weld strength. ANOVA was employed to identify the significantly affecting process parameters on weld strength. The optimum weld strength conditions for various sheet thicknesses was validated through confirmatory tests. The research finding provide valuable insights into understanding how the change in weld properties contribute in enhancing the weld joint quality.