A method for manufacturing a bladed rotor, the method comprising: arranging bladed pieces in a ring formation such that contiguous bladed pieces contact along shank-to-shank bonding interfaces, the bladed pieces composed of a first material; positioning the ring formation around a hub disk having an outer circumferential surface contacted by the bladed pieces along a shank-to-hub bonding interface, the hub disk composed of a second material different than the first material; and performing a Hot Isostatic Pressing process during which the ring formation and the hub disk are exposed to elevated temperatures and pressures external to the hermetic cavity sufficient to diffusion bond the shank-to-shank bonding interfaces and the shank-to-hub bonding interface; characterized in that the method further comprises depositing a metallic sealing material between contiguous bladed pieces in the ring formation utilizing a computer-controlled fusion deposition process to produce alloy-filled joints around a circumference of the ring formation forming an annular seal around the ring formation, wherein the term alloy-filled joint encompasses a joint at least partially filled with an alloy or a metal that is at least 99 percent pure by weight; forming a hermetic cavity circumferentially bounded by the annular seal and enclosing the shank-to-shank bonding interfaces and the shank-to-hub bonding interface; and further characterized in that, during the computer-controlled fusion deposition process, the metallic sealing material is actively supplied to a site-of-deposition and continually heated to a temperature exceeding the melt or softening point of the metallic sealing material utilizing a computer-controlled heat source. arranging bladed pieces in a ring formation such that contiguous bladed pieces contact along shank-to-shank bonding interfaces, the bladed pieces composed of a first material; positioning the ring formation around a hub disk having an outer circumferential surface contacted by the bladed pieces along a shank-to-hub bonding interface, the hub disk composed of a second material different than the first material; and performing a Hot Isostatic Pressing process during which the ring formation and the hub disk are exposed to elevated temperatures and pressures external to the hermetic cavity sufficient to diffusion bond the shank-to-shank bonding interfaces and the shank-to-hub bonding interface; characterized in that the method further comprises depositing a metallic sealing material between contiguous bladed pieces in the ring formation utilizing a computer-controlled fusion deposition process to produce alloy-filled joints around a circumference of the ring formation forming an annular seal around the ring formation, wherein the term alloy-filled joint encompasses a joint at least partially filled with an alloy or a metal that is at least 99 percent pure by weight; forming a hermetic cavity circumferentially bounded by the annular seal and enclosing the shank-to-shank bonding interfaces and the shank-to-hub bonding interface; and further characterized in that, during the computer-controlled fusion deposition process, the metallic sealing material is actively supplied to a site-of-deposition and continually heated to a temperature exceeding the melt or softening point of the metallic sealing material utilizing a computer-controlled heat source.