Dissimilar joining of nickel–chromium alloys (Ni–Cr Alloys) and austenitic stainless steel (ASS) by fusion-based welding technologies is often studied to reduce the weight and cost of the power producing industries without affecting the plant efficiency. Laser welding being one of the sophisticated fusion-based welding involving high energy input giving a precise joint. It involves different parameters of the laser beam which has significant effect on the weld quality. Continuous-mode laser welding (CMLW) and pulsed-mode laser welding (PMLW) are the two modes of laser welding. This article provides a detailed review of welding of Ni–Cr alloys and austenitic stainless steel (ASS) that is used in various industries. The effect of the laser beam parameters on the welded joint is also studied corresponding to the penetration depth, cross-sectional area and temperature changes of the fusion zone. To enhance the properties of fusion zone, different techniques are used such as laser offsetting, dual beam laser, two pass laser, hybrid laser and split beam. Interlayers and fillers have also been imparted in between the dissimilar materials during welding to improve the weld properties. Simultaneously, this paper had reviewed for the use of dissimilar joining, interlayer/filler used in dissimilar welding and effect of laser parameters on welded joint with good quality.