In TIG (Tungsten Inert Gas) welding process Welding Current and Speed are important parameters. This paper investigates into microstructure and some mechanical properties of TIG welded Ti-6Al-4V Titanium alloy. Welding was carried by varying welding current and speed while keeping other parameters constant. It investigates into microstructures of different zone around the welded joint and found that microstructures become coarser near the Fusion Zone (FZ) and Heat Affected Zone (HAZ) and β-Phase predominant at FZ. The analysis of microhardness shows that as we move from base metal to weld centreline hardness value increases and maximum value of hardness was found at Fusion Zone. Highest value of hardness was found to be 472 HVN which is very high compare to base metal which is at low speed and high current i.e. of Sample S3.

Light-weight materials, such as titanium alloy, have been extensively investigated. This paper primarily focuses on microstructural, metallurgical, and mechanical properties of the pug cutter embedded tungsten inert gas (TIG) welding of Ti-6Al-4V titanium alloy. In this work, TIG welding was modified to control the speed and the arc length. Analysis revealed that the microstructure underwent severe changes at different zones: coarsened in the fusion zone (FZ) and enlarged in the heat-affected zone (HAZ). The microstructure was finer at the base metal than those in the FZ and the HAZ, and the Vickers hardness values decreased from weld center line to the base metal. Tensile test showed that the specimen with low current and high speed was broken below its ultimate tensile strength, whereas most of the samples were broken at the base metal region that had a similar strength to that of the parent metal. The elongation of the metal was primarily affected by the heat input. A high volume of heat increased the hardness and the brittleness, resulting in low ductility.