This research involves studying the mechanical properties of AISI 304 austenitic stainless steel, welding using TIG welding. The mechanical properties include testing of microhardness, tensile strength. The objective of the present work was to study the tungsten inert gas welding (TIG) of 5mm thick AISI 304 austenitic stainless steel plates. TIG welding with different voltage and constant welding speeds, characteristics such as strength, Young’s modulus and elongation of the samples were determined by tensile tests, while the hardness was measured by Vickers micro hardness. The materials have been observed to possess different mechanical and microstructural properties, which are compared and discussed. The microstructure of the TIG weld shows that the solidified structure is dendritic and contains austenite and a few percent of delta ferrite.