Analysis of Tensile Strength, Ultimate Tensile Strength and Micro Hardness for TIG Welding on Material AISI 304 Stainless Steel

The experimental work is to be carried out to investigation of tungsten inert gas (TIG) welding for tensile test on AISI 304 Stainless Steel hardness and distortion of V grooves butt weld joint of AISI 304 stainless steel material. Focus of this project work to identify strength of welded joint by changing the welding process. The austenitic grades have well to excellent corrosion resistance and weldability. Their good impact strength at low temperatures is often exploited in cryogenic application. The higher ultimate tensile strength 646 mpa produced at 45 groove angle, 1.5 mm root face and 1.5mm root gap in TIG welding. The ultimate tensile strength of TIG butt welds reaches to 97 % of the base metal ultimate tensile strength (i.e 664mpa). Optimization of response variables is performed by grey relation analysis (GRA). TIG GRA indicates that tensile strength 641 MPa and micro hardness 236 Hv is obtained for optimum process parameter of groove angle 60 degree, root face 1 mm and root gap 1.5 mm. Higher micro hardness 236 Hv produced at 60 groove angle, 1 mm rib thickness and 1.5 root gap in TIG welding.