Interpulse Tig Welding of Titanium Alloy (TI-6Al-4V)

The unique properties of Titanium alloy (Ti-6Al-4V) like high strength to weight ratio, low density has made the alloy very useful material in the manufacturing of compressor blades, casings and other structural components of the gas turbine engines. The TIG welding is an arc welding process widely used in the fabrication of gas turbine engine components and its assembly. The Interpulse technique is the modified version of TIG welding process. Due to magnetic constriction and high frequency modulation of current in the interpulse technique, the arc is getting constricted which further minimizes the net heat input. In this experiment response surface optimization technique has been adopted to evaluate the effects of the input variables (main current, delta current, travel speed), on output responses (weld bead width, reinforcement height and area, penetration height and area and HAZ area). The outcome shall be beneficial in selecting suitable parameters to obtain the required shape and quality of the weld bead geometry.