Hardfacing is the application of a hard wear resistant material on the surface of a component to reduce the loss of material by abrasion, impact, erosion, galling and cavitation. The common Fe,Co,Ni & WC based hardfacing alloys suffers from thermal softening, structural Instabilities upon prolonged exposure to high temperature, delamination of carbides and poor machinability. This clearly indicates the need for advanced hardfacing alloys which can sustain at extreme environments. High entropy alloys (HEAs) are possessing very attractive mechanical and functional properties due to their core effects. HEAs will be candidate materials for the hardfacing applications due to following reasons. Excellent ambient & high temperature properties such as strength, hardness, wear, oxidation & corrosion resistance, higher thermal stability, better machinability, cost effective & no need of Interlayers. Several HEA systems were successfully deposited till date on steels and non-ferrous alloys. Laser/plasma based deposition techniques, thermal spraying, vapor deposition techniques were extensively used for the fabrication of HEA Coatings (HEACs). Instead of superior performance of HEACs, there are certain challenges for commercial exploitation. The fabrication of HEACs Involves multiple pre-processing steps such as vacuum melting & atomization, HEBM, SPS, hot rolling / extrusion. The manufacturing of industrial scale and cost effective HEA weld consumables without compromising on stringent compositional and phase requirements is a highly challenging task. The present research will focus on developing large scale In Situ HEACs through arc weld cladding route. The scope of research extends to the design of HEA weld consumables through the CalPhaD approach, reducing pre-processing steps, microstructural design for cost and performance optimization. The preliminary studies on the deposition of non equiatomic CoCrFeMnNi & AlCoCrFeNiTi HEACs with SS304 metal cored wires on steel substrate were successful. Defect free coatings (confirmed by microstructural studies) were obtained with manual GTAW cladding. Single phase (confirmed by XRD) and higher configurational entropy (≈1.6 R, confirmed by SEM-EDS analysis) were achieved.