A method of welding for joining two metallic discs (12, 14) comprising the steps of: melting the metallic discs (12, 14) in a weld region into a molten state to form a weld pool through an energy input by directing at least one first source of energy on the metallic discs (12, 14) to join the metallic discs (12, 14), the method of welding for joining two metallic discs being characterised by further comprising the steps of focusing at least one second source of energy to heat a heating region surrounding the complete weld pool from all sides to reduce cooling rate and extend solidification time of the weld pool, wherein the at least one first source of energy is a single or multiple heat source and the at least one second source of energy is multiple heat sources; wherein the at least one first source of energy and the at least one second source of energy are beams of energy sources such as, electric arc sources, laser sources, electron beam sources, plasma sources, ultrasonic beams or combination of those; and wherein, the at least one second source of energy is a moving beam, wherein, the moving beam is adapted to be focused via multiple heat sources located at multiple locations above the weld pool on at least one position of heating region, surrounding the complete weld-pool; the step of joining two metallic discs (12, 14) is performed in two stages, the first stage being a root weld and the second stage being a fill-up weld; adapting the moving beam to be focused via multiple heat sources located at multiple locations on heating position towards disc and heating position towards disc besides the weld pool along with the leading pre-heating position in front of the weld pool and the trailing post-heating position behind the weld pool in the root weld; and heating at heating positions and induce a compressive stress, pulling and keeping both the discs (12, 14) with nearly zero gap pressed to each other towards the weld pool thereby reducing the tolerance limit for zero gap in the root weld. melting the metallic discs (12, 14) in a weld region into a molten state to form a weld pool through an energy input by directing at least one first source of energy on the metallic discs (12, 14) to join the metallic discs (12, 14), the method of welding for joining two metallic discs being characterised by further comprising the steps of focusing at least one second source of energy to heat a heating region surrounding the complete weld pool from all sides to reduce cooling rate and extend solidification time of the weld pool, wherein the at least one first source of energy is a single or multiple heat source and the at least one second source of energy is multiple heat sources; wherein the at least one first source of energy and the at least one second source of energy are beams of energy sources such as, electric arc sources, laser sources, electron beam sources, plasma sources, ultrasonic beams or combination of those; and wherein, the at least one second source of energy is a moving beam, wherein, the moving beam is adapted to be focused via multiple heat sources located at multiple locations above the weld pool on at least one position of heating region, surrounding the complete weld-pool; the step of joining two metallic discs (12, 14) is performed in two stages, the first stage being a root weld and the second stage being a fill-up weld; adapting the moving beam to be focused via multiple heat sources located at multiple locations on heating position towards disc and heating position towards disc besides the weld pool along with the leading pre-heating position in front of the weld pool and the trailing post-heating position behind the weld pool in the root weld; and heating at heating positions and induce a compressive stress, pulling and keeping both the discs (12, 14) with nearly zero gap pressed to each other towards the weld pool thereby reducing the tolerance limit for zero gap in the root weld.