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Study of Weld Quality Characteristics of Inconel 625 Sheets at Different Modes of Current in Micro Plasma Arc Welding Process

Kondapalli Siva Prasad, Chalamalasetti Srinivasa Rao, and Damera Nageswara Rao

Inconel 625 is a Nickel alloy which was used in fabrication of high temperature resistance and corrosion resistance components, such as metal bellows used in expansion joints in aircraft, aerospace and petroleum industry. The paper focuses on studying the effect of continuous current and pulsed current in welding Inconel 625 sheets using Micro Plasma Arc Welding (MPAW) process. Welding was carried out on 0.25 mm thick Inconel 625 sheets using continuous current mode and pulsed current mode separately keeping all other welding parameters constant. Weld quality characteristics like bead profile, micro structure, hardness and tensile properties are investigated and it is found that the usage of pulsed current leads to better weld quality characteristics when compared to continuous current mode