Modeling and optimization of friction stir stitching of AISI 201 stainless steel via Box-Behnken design methodology

Abstract The paper investigates the modelling and optimization of notch-repaired/friction stir stitched AISI 201 stainless steel welds via use a non-consumable tool-based repair process. process employs sequential hopping-stitching approach. This approach involves application two intercepted completely overlapped plunging actions probe-less titanium carbide tool to create an effective refilling notched zone. Box-Behnken design (BBD) was employed for experimental planning, modelling, notch-repair Tool rotational speed, penetration depth dwell time were studied parameters while tensile strength response variable. A quadratic model identified as best notch-repaired based on combination low P-value 0.008216, high lack fit 0.931366, close unity adjusted predicted R-square values. parameter their interaction effects repaired notch ANOVA analysis. Plunge (main effect) effect speed had significant influences resultant steel. visual representations these shown through 2D elliptical contour 3D surface plots. optimized 1215.9795 rpm, 0.40262212 mm, 5.98706376 s joint yielded 886 MPa, which is value.