Parametric optimization of resistance spot welding for multi spot welded lap shear specimen to predict weld strength

Abstract

Abstract This paper examining the impact of welding parameters, by parametric investigation of multi spot welded lap shear specimen, on the tensile shear strength of spot welded specimen. Further, study is carried out, to develop mathematical model by using regression analysis which shows relationship between selected welding parameters and weld strength. The design parameters considered are specimen thickness, number of spots and distance between the spots while process parameters are electrode force and weld current. As per Taguchi design of experiment approach, five welding parameters with three levels of each are considered for analysis. Experimentation is carried out as per L27 orthogonal array to investigate the effect of process and design parameters on tensile shear strength. Particle swarm optimization (PSO) method was used to determine welding parameter has a significant impact on weld strength. Tests for confirmation have been conducted to validate the results. Confirmation tests exhibit that deviation between the results obtained by experimentation and regression is up to 0.571741%. Particle swarm optimization explore that maximum tensile shear strength 9399.55 N is obtained at 06 numbers of spot and 16 mm distance between the spots as optimum value for 1.22 mm galvanized steel sheets.