A REVIEW PAPER- THE EFFECT OF ACTIVATING FLUX IN TIG WELDING OF SS321

MECHANICAL ENGINEERING

Welding is a manufacturing process which is carried out for joining of metals by Tungsten inert gas (TIG) welding. This is the one type of Gas tungsten arc welding (GTAW), during which Argon (Ar) inert gas is supplied or used as an inert gas. Shielding gas argon is used and non-consumable tungsten electrode is used which also plays role of conductor. TIG welding is versatile, gives very little loss of alloying elements and can be operated as semi as well as fully automated. All welds were prepared by TIG welding technique. We have studied design of experiments for this work and by use of the experimental data have optimized by analysis of variance (ANOVA) method. In which input parameters for TIG welding are welding current, Arc voltage and welding speed and the output parameter is tensile strength and microstructure. We were used austenitic stainless steel of AISI 321 material and Cr2O3 and MgCO3 flux used for during welding process. Joint of plate have been planned to perform on 6 mm plate thicknesses of stainless steel 321 and direct square butt joint is used for this study. For Experimental design we were use Taguchi method (L9) orthogonal array to find out number of readings. The output factors are measured in UTM and microscope. Results show robust relation and strong comparison between the weld strength, microstructure and process parameters. To find out proportion contribution of every input parameter for getting optimum conditions, we were used analysis of variance (ANOVA) method.

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