Multi Objective Optimization of Process Parameters in TIG Welded Joints for Mild Steel

The Joining of the mild steel is often used in industry. This material is used not only in many of the steam pressure and water containing systems in power plants but also in the supports for these systems. In the fabrication of water and steam pressure containing system demands higher tensile strength along with higher percentage of elongation. The other mechanical properties at the weld bead should also be at the optimum level. Several process parameters interact in the complex manner resulting in direct or indirect influence on the mechanical properties. It is necessary to find out the optimum process condition capable of producing desired weld quality. Therefore to achieve the typical tensile strength and percentage elongation in TIG welding is the primary objective of this study. This is achieved by using Grey relational Analysis for the purpose of multi objective optimization. The optimum values for the tensile as well as percentage elongation along with their multi objective characteristics are found out and analyzed.