The effect of argon flow rate on the mechanical properties of a titanium welding joint

Titanium is known for its superior strength and corrosion resistance and is widely used in various industries. The process of joining titanium through the welding process has become the primary choice in joining titanium. In this work, Grade 1 unalloyed Ti is welded using ultra-high argon purity (UHP). Tensile test and hardness test were performed to investigate the mechanical properties of the weld joint. Microstructure weld joint was investigated through microstructure procedure. The hardness and tensile tests showed the results on weld joint with flow rate 15 l/min to get maximum hardness (162 VHN), and minimum hardness was obtained at flow rate 25 l/m. The tensile test revealed that maximum tensile strength was obtained at a flow rate of 60 l/min (26.28 kg / mm2). The microstructure observation shows the phase change from HCP (α) to acicular, alpha platelets in the HAZ, and fusion regions.