A method of fabricating a rotor assembly for an electric motor, the method comprising: inserting a plurality of rotor bars into a corresponding plurality of slots within a stack of laminated discs, wherein a first portion of each of said plurality of rotor bars protrudes from a first end surface of said stack of laminated discs, and wherein a second portion of each of said plurality of rotor bars protrudes from a second end surface of said stack of laminated discs; mounting a first end cap to said plurality of rotor bars, wherein said first portion of each of said plurality of rotor bars fits within a corresponding slot of a first plurality of slots in said first end cap; mounting a second end cap to said plurality of rotor bars, wherein said second portion of each of said plurality of rotor bars fits within a corresponding slot of a second plurality of slots in said second end cap; directing a first electron beam towards a circumferential side surface of said first end cap and fusing at least a region of said first portion of each of said plurality of rotor bars to said corresponding slot of said first plurality of slots of said first end cap; and directing a second electron beam towards a circumferential side surface of said second end cap and fusing at least a region of said second portion of each of said plurality of rotor bars to said corresponding slot of said second plurality of slots of said second end cap; characterized in that said step of directing said first electron beam further comprises: directing said first electron beam at a first location offset from a first juncture defined by an outermost surface of said first portion of each of said plurality of rotor bars and an axially innermost seating surface of said corresponding slot of said first plurality of slots of said first end cap, in which the rotor bars contact the first end cap, wherein said first location is offset from said first juncture in a direction towards the axially outermost surface of said first end cap; and said step of directing said second electron beam further comprises: directing said second electron beam at a second location offset from a second juncture defined by an axially outermost surface of said second portion of each of said plurality of rotor bars and an axially innermost seating surface of said corresponding slot of said second plurality of slots of said second end cap, in which the rotor bars contact the second end cap,wherein said second location is offset from said second juncture in a direction towards the axially outermost surface of said second end cap. inserting a plurality of rotor bars into a corresponding plurality of slots within a stack of laminated discs, wherein a first portion of each of said plurality of rotor bars protrudes from a first end surface of said stack of laminated discs, and wherein a second portion of each of said plurality of rotor bars protrudes from a second end surface of said stack of laminated discs; mounting a first end cap to said plurality of rotor bars, wherein said first portion of each of said plurality of rotor bars fits within a corresponding slot of a first plurality of slots in said first end cap; mounting a second end cap to said plurality of rotor bars, wherein said second portion of each of said plurality of rotor bars fits within a corresponding slot of a second plurality of slots in said second end cap; directing a first electron beam towards a circumferential side surface of said first end cap and fusing at least a region of said first portion of each of said plurality of rotor bars to said corresponding slot of said first plurality of slots of said first end cap; and directing a second electron beam towards a circumferential side surface of said second end cap and fusing at least a region of said second portion of each of said plurality of rotor bars to said corresponding slot of said second plurality of slots of said second end cap; characterized in that said step of directing said first electron beam further comprises: directing said first electron beam at a first location offset from a first juncture defined by an outermost surface of said first portion of each of said plurality of rotor bars and an axially innermost seating surface of said corresponding slot of said first plurality of slots of said first end cap, in which the rotor bars contact the first end cap, wherein said first location is offset from said first juncture in a direction towards the axially outermost surface of said first end cap; and said step of directing said second electron beam further comprises: directing said second electron beam at a second location offset from a second juncture defined by an axially outermost surface of said second portion of each of said plurality of rotor bars and an axially innermost seating surface of said corresponding slot of said second plurality of slots of said second end cap, in which the rotor bars contact the second end cap,wherein said second location is offset from said second juncture in a direction towards the axially outermost surface of said second end cap.