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Martensitic stainless steels are very difficult to weld. In this proposed work, effort is given on picking TIG welding optimum input parametric combination to join AISI 420 grade sheets.Welding current, shielding gas flow rate and welding (travel) speed are taken as input parameters. Whereas, ultimate tensile strength (UTS) and ductility (D) i.e. elongation of the weldment are considered as response or output parameters. Initially, response surface methodology (RSM) based face-centered central composite design (CCD) is employed for mathematical modeling by regression analysis. Next, six efficient metaheuristics and RSM optimization have been applied to maximize the output welding parameters. From the simulated results, the optimum parametric setting i.e. best set of welding current, gas flow rate and welding speed is identified in for maximization of UTS and D. Confirmatory tests are also conducted to validate the proposed approach.


AISI 420 Grade Martensitic Stainless Steel, Homogeneous TIG Welding, RSM Modeling, Metaheuristic, Optimization.
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