Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Having wear liner – sheathing or insert
Patent
1991-07-10
1993-02-02
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Having wear liner, sheathing or insert
416241R, 298897, 298891, 2988971, 228112, B63H 126
Patent
active
051833905
ABSTRACT:
A steam turbine blade is provided having a trailing edge portion formed from an erosion resistant material deposited on the blade airfoil by a friction surfacing method. According to the method, a rotating consumable rod of erosion resistant material is placed in contact under axial load against a bonding surface formed on the airfoil, thereby causing a portion of the rod adjacent the bonding surface to be plasticized. The rod then traverses the surface linearly leaving in its wake a layer of erosion resistant material bonded to the airfoil by a high quality metallurgical bond. The layer is then ground to form the smooth contour desired for the trailing edge.
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ASM Committee, "Friction Welding," Chapter from American Society for Metals Handbook, 9th ed., 1983.
"Friction Surfacing," The Welding Institute Technology Data Sheet, publication date, if any, unknown--came into inventor's possession in spring 1989.
W. M. Thomas, "Solid Phase Cladding by Friction Surfacing," Paper No. 18, Welding for the Process Industries (Apr. 1988).
E. D. Nicholas, "Friction Welding Non-Circular Sections with Linear Motion-A Preliminary Study," The Welding Institute, (1987).
Look Edward K.
Mattingly Todd
Westinghouse Electric Corp.
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