IMPLEMENTATION OF TOPSIS TECHNIQUE FOR OPTIMIZE PROCESS PARAMETERS OF TUNGSTEN INERT GAS (TIG) WELDING OF STAINLESS STEEL 304L

Mechanical Engineering

The production and manufacturing industries has taken advantage of TIG welding to join thin section of metals. Improved quality of weld for stainless steel and non-ferrous alloys are also obtained by TIG welding process. Due to shallow penetration, the TIG welding has lower productivity than Arc welding processes. Which results having application in only to join thin sections. Now-a-days in industries stainless steel 304L is commonly used because of its resistance to corrosion, higher tensile strength and better creep rupture strength. In this study welded joints have been made by using three levels of Current, Gas flow rate and Root gap. The design of experiment is prepared by using Taguchi method. Minitab 19.0 software is used for the preparation of design of experiment. The optimization of process parameters for higher Tensile strength, hardness and depth of penetration of joint is done by using TOPSIS optimization technique. For 110A of current, 7 lit/s of Gas flow rate and 2 mm of root gap gives the best optimum results of high tensile and hardness.

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