Mechanical properties of weld joints are weld penetration dependent. Penetration in TIG welding process is always difficult. Stainless steels are always used in high valued products such as aerospace, defence, and nuclear. There are different type of stainless steel like austenitic stainless steel, ferritic stainless steel, duplex stainless steel, and precipitation stainless steel. This research considers the significant welding parameters of AISI 316 by TIG welding. The experiments are designed based on Taguchi methodology. Parameters such as electrode diameter, arc gap, welding speed, welding current, and gas flow rate are taken into consideration in the experiments to observe how they influence hardness, elongation, and tensile strength under various conditions. The results showed good agreement with the results calculated using the Taguchi optimization method. The results shows that optimum current 175 A, gas flow rate is 20 litter per min, electrode size is 1.4 mm, and arc gap of 1.5 mm to optimize the mechanical properties. The yield strength of the material can be improved by using higher current and electrode diameter. The work identifies the important parameter to improve the weld quality of varying thickness by using Taguchi method. The outcomes contribute to the advancement of precision welding processes, enhancing mechanical performance and structural integrity in stainless steel applications.