Parametric observation of TIG welding on AISI 304 stainless steel of thickness 5?mm

Abstract

5 mm thickness of AISI 304 Stainless Steel plate was used for welding and the type of welding was selected TIG welding for its various advantages. In TIG welding it has been observed that by combining different process parameters like welding speed, current and gas pressure remarkable changes occurred on weld zone, Heat Affected Zone and on mechanical properties of welding material. Microstructure measurement and micro hardness test was performed on TIG welding joint in order to get the reasonable changes after welding. It has further investigated the microstructural changes occurred on welding zone and HAZ in every specimen was found prominent when input current was high, hardness in weld zone decreases with increase in current and increases with increase of welding speed. When Bead width and DOP has been considered it has been observed that Bead width and DOP was found to be increased with increase in input current and decreased when welding speed is increased it means current is directly proportional to the Bead width and DOP and inversely proportional to welding speed. It also observed that gas pressure is also very important parameter to get the better weldment hardness, bead width and DOP increases with the increase of gas pressure and decreases when gas pressure decreases.