Abstract
Martensitic stainless steels are hard, brittle and notch sensitive. They are least weldable in the stainless steel family; crack formation during welding is frequent. Hydrogen induced cracks may appear even few hours after welding. Retention of mechanical properties (strength, ductility, hardness etc) by the welded joint is a matter of concern. All these matters make welding martensitic stainless steel challenging for engineers. In the present work, focus is given on the selection of optimum TIG welding parameter for welding of martensitic stainless steel AISI 420. Ultimate tensile strength (UTS) of the joint has been taken as output response parameter. A regression equation has been developed by response surface methodology (RSM) to predict the response parameter as a function of input parameters. BP-ANN (Back propagation artificial neural network) model has also been developed to establish a correlation between response and process parameters. Process optimization has also been tried by using desirability function approach and genetic algorithm (GA). TIG welding has been done successfully without any major defects by using a preheat up to 250°C, and optimal UTS is evaluated by GA and RSM along with ANN.
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