Experimental Analysis on the Mechanical Properties of Dissimilar Material Joint During PCTIG Welding

Abstract

During TIG welding on dissimilar joint weldment between copper and brass, reduced mechanical strength is observed. To overcome these challenges, pulsed current tungsten inert gas (PCTIG) welding technique has been employed. Experimental investigations were carried out using TIG welding and PCTIG welding with AC and DC currents on dissimilar joints of copper and brass and mechanical properties such as microhardness were compared. AC-PCTIG with 5 Hz resulted in improved microhardness of 92.66 Hv on weld zone. DC-PCTIG with 100 Hz resulted in microhardness of 107.5 Hv on the weld zone. Mixed-mode current consisting of half-cycle of AC current and another half-cycle of DCEN mode was also carried out on PCTIG welding. Due to the influence of the DCEN current, the mechanical properties suffer reduction and weld strength lies between the AC and DCEN welded conditions.