Thermal stresses can produce a non-uniform plastic deformation in the welded joints. An experimental investigation has been made to analyze the thermal stresses and thermal fields developed in the GTAW process for similar and dissimilar welded joints of Monel 400 and SS 316 using ERNiCrMo-3 filler wire. During welding, the temperature profiles of weldments have been measured using Infrared Thermography. The residual stress has been measured using X-Ray diffraction method. This paper reports on the weldability, microstructure studies and mechanical properties. The nature of Residual stresses has been observed in these welded joints and compared. © 2019, Politechnica University of Bucharest. All rights reserved.