Optimizing Pulsed Current Micro Plasma Arc Welding Parameters to Maximize Ultimate Tensile Strength of SS304L Sheets Using Hooke and Jeeves Algorithm

Abstract

SS 304L is an austenitic Chromium-Nickel stainless steel offering the optimum combination of corrosion resistance, strength and ductility. These attributes make it a favorite for many mechanical components. The paper focuses on developing mathematical model to predict ultimate tensile strength of pulsed current micro plasma arc welded SS304L joints. Four factors, five level, central composite rotatable design matrix is used to optimize the number of experiments. The mathematical model has been developed by response surface method and its adequacy is checked by ANOVA technique. By using the developed mathematical model, ultimate tensile strength of the weld joints can be predicted with 99% confidence level. Contour plots are drawn to study the interaction effect of welding parameters on ultimate tensile strength of SS304L weld joints. The developed mathematical model has been optimized using Hooke and Jeeves Method to maximize the ultimate tensile strength.Keywords. Pulsed current micro plasma arc welding, SS304L, ultimate tensile strength, design of experiments, ANOVA , Hooke and Jeeves algorithm.

Study on Effect of Welding Speed on Micro Structure and Mechanical Properties of Pulsed Current Micro Plasma Arc Welded Inconel 625 Sheets

“…From the earlier works [6][7][8][9] carried out on Pulsed Current MPAW it was understood that the peak current, back current, pulse rate and pulse width are the dominating parameters which effect the weld quality characteristics. The values of process parameters used in this study are the optimal values obtained from our earlier papers [3][4][5]. Hence peak current, back current, pulse rate and pulse width are chosen and their values are presented in Table 3.…”

“…From the earlier works reported on Inconel 625 [3][4][5] it is understood that selection of welding process parameters play a vital role in obtaining the desired weld quality. Hence, an attempt is made to study the welding quality characteristics.…”

Application of Hooke & Jeeves Algorithm in Optimizing Fusion Zone Grain Size and Hardness of Pulsed Current Micro Plasma Arc Welded AISI 304L Sheets

“…From the literature review [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] it is understood that in most of the works reported the effect of welding current, arc voltage, welding speed, wire feed rate, magnitude of ion gas flow, torch stand-off, plasma gas flow rate on weld quality characteristics like front melting width, back melting width, weld reinforcement, welding groove root penetration, welding groove width, front-side undercut are considered. However, much effort was not made to develop mathematical models to predict the same especially when welding thin sheets in a flat position.…”