Comparative Study of PCTIG and DPTIG Welding on SMO 254 Joints with Alloy C22 Filler
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Abstract
This work focuses on investigating the effect of conventional pulse TIG (PCTIG) and novel double pulse (DPTIG) welding on microstructure, mechanical and corrosion properties of SMO 254 (SASS) joints. Both welding techniques used alloy C22 (ERNiCrMo-10) filler metal and different heat input. Microstructural characterization was done using optical microscope, SEM with EDAX techniques. Charpy impact, tensile test and micro-Vickers hardness test was used to investigate the mechanical properties. The fracture analysis was done after tensile and Charpy impact test. The outcome of investigation shows grain refinement, improved tensile strength and more hardness in using DP technique when compared with PC technique. Uniform precipitation noted in double pulse weld metal fusion zone. The DP-TIG weld specimen exhibits a greater strength (209 J) in the Charpy impact test compared to the PC-TIG weld specimen (143.5 J). With a corrosion rate of 0.001269 mpy, the DP-TIG weldment outperformed the PC-TIG weldment, which had a corrosion rate of 0.31977 mpy.
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