Methods for processing bonded dual alloy rotors are provided. In one embodiment, the method includes obtaining a bonded dual alloy rotor including rotor blades bonded to a hub disk. The rotor blades and hub disk are composed of different alloys. A minimum processing temperature (T.sub.DISK.sub._.sub.PROCESS.sub._.sub.MIN) for the hub disk and a maximum critical temperature for the rotor blades (T.sub.BLADE.sub._.sub.MAX) is established such that T.sub.BLADE.sub._.sub.MAX is less than T.sub.DISK.sub._.sub.PROCESS.sub._.sub.MIN. A differential heat treatment process is then performed during which the hub disk is heated to processing temperatures equal to or greater than T.sub.DISK.sub._.sub.PROCESS.sub._.sub.MIN, while at least a volumetric majority of each of the rotor blades is maintained at temperatures below T.sub.BLADE.sub._.sub.MAX. Such a targeted differential heat treatment process enables desired metallurgical properties (e.g., precipitate hardening) to be created within the hub disk, while preserving the high temperature properties of the rotor blades and any blade coating present thereon.

A method to repair a peripheral portion of a body including: removing a damaged portion from a peripheral region of the body; mounting a replacement ring to the body after removal of the damaged portion; forming an interior groove between the inner surface of the replacement ring and the peripheral surface of the body, wherein the groove is between ridges; welding the replacement ring to the body, wherein weld material is applied only within end grooves, and leaving a void in said center section after the welding of the replacement ring to the body.

Provided is a rotating body, comprising: an impeller including: a main body portion; a welded surface formed on a back surface of the main body portion; a recessed portion, which is formed in the main body portion on a radially inner side with respect to the welded surface; and a reinforcing portion, which is formed on the main body portion on the radially inner side with respect to the recessed portion; and a shaft including: a welding surface welded to the welded surface; and a projection portion, which is formed on the radially inner side with respect to the welding surface, projects toward the impeller side with respect to the welding surface, and is inserted into the recessed portion, the shaft receiving a distal end of the reinforcing portion inserted thereinto on the radially inner side with respect to the projection portion.

A method for the manufacture of a cylindrical component suited to use in a high temperature environment and incorporating an erosion resistant coating (4) on its outer cylindrical surface (6) is described. The method comprises, in sequential steps; providing a work piece (1) having a cylindrical body including a pair of axially spaced radially extending ribs (3a, 3b) defining an annular trough (2) therebetween. Shot peening the work piece (1). Applying an erosion resistant coating (4) in the annular trough (2) to a depth which sits radially inwardly of the radially outermost ends of the ribs (3a, 3b). Turning the radially outermost ends of the ribs (3a, 3b) whereby to match the depth of the coating (4) and provide an outer cylindrical surface with a consistent diameter across both ribs (3a, 3b) and the coating (4).

A method for welding a first powder metallurgical (PM) part to a second powder metallurgical (PM) part includes: working a first face of the first PM part; working a first face of the second PM part; and friction welding the first face of the first part to the first face of the second part.

A process for producing a turbine rotor (1), which has, as joining partners, a turbine wheel (2) made of TiAl and a shaft (3) produced from steel, with the following process steps: providing the turbine wheel (2); providing a solder; providing the shaft (3); and connecting the turbine wheel (2) and the shaft (3) by electron beam soldering by means of an electron beam (5).

The invention relates to a rotor shaft adapted to rotate about a rotor axis thereof. The rotor shaft includes a rotor cavity configured concentrically or quasi-concentrically to the rotor axis inside the rotor shaft, and a plurality of cooling bores extending radially or quasi-radially outward from the inside to an outside of the rotor shaft. Each cooling bore having a bore inlet location and a distal bore outlet portion, the respective bore inlet location being adapted to abut on the rotor cavity. At least one side or part-side of the cooling bore inlet location is provided with an asymmetric edge fillet in order to maximize the wall thickness between two adjacent cooling bores.

Provided is joint part capable of suppressing diffusion of carbon and nitrogen contained in the steel member to the TiAl-based alloy member and suppressing formation of voids, titanium carbide or a nitride due to diffusion of carbon and nitrogen contained in the steel member, and thereby suppressing decrease in the brazing strength. A joint part comprises a steel member containing alloy elements including C and Cr, a TiAl-based alloy member, and a Ni-based brazing filler metal via which the steel member and the TiAl-based alloy member are joined to each other, wherein the steel member has a carbide and a nitride each forming a bond with at least one of the alloy elements at least on a side of a boundary with the Ni-based brazing filler metal, and diffusion of C and N to the Ni-based brazing filler metal adjacent to the TiAl-based alloy member is suppressed by the carbide and the nitride. The joint part may be a turbine body 1 comprising a turbine wheel 2 and a shaft 3, and a structural steel material of the shaft 3 is structural steel material containing 0.30 to 0.45 wt % of C and 0.85 to 1.25 wt % of Cr, or a martensitic stainless steel material containing at most 15 wt % of C and 11.5 to 13 wt % of Cr.

A weldment includes a first component, a second component, and a weld joint coupling the first and second components together. The weld joint forms a heat affected zone in the first component and creates residual tensile stress in the first component. The first and second components cooperate to define a pocket configured to position a highest magnitude of the residual tensile stress in the first component in a location that is outside of the heat affected zone of the first component.

A method for the manufacture of a blisk drum is described. Disc forging for inertia welding together are provided with sacrificial material whose shape and position is selectively provided such that, on completion of the inertia welding process, integral blades can be fashioned from the sacrificial material. Other components such as buckets and balancing lands may also be provided from the sacrificial material.