Experimental Studies on TIG Welding of Advanced Material under various parameters

Abstract

The material stainless steel (AISI 309) is extensively used in almost all types of thermal power plant, petroleum industries, waste treatment industries etc. The material AISI 309 stainless steel is used as sample which is prepared by wire cut EDM process. The sample dimension is tested according to the ASTM standard. Tungsten inert gas (TIG) welding is used to improve mechanical properties and to reduce the manufacturing costs, by the taguchi`s experimental design method which is used for optimization. The three different welding process parameters such as GFR, WS and WC have opted to perform the tests using L9 orthogonal array. The tensile strength and bending strength test are conducted to check the final weld quality. The maximization of ultimate tensile strength, impact strength and bending strength of weld joints results has obtained by input parameters such as welding current 170amp, welding speed 2 mm/sec and gas flow rate 15 lit/min. It is observed that current and welding speed influence to maximize mechanical properties of weld joints.