IMPROVEMENTS IN TURBINE ROTOR BLADE EROSION SHIELD ATTACHMENT

摘要

1,271,758. Making turbine blades; welding by fusion. GENERAL ELECTRIC CO. 15 Dec., 1969 [7 Feb., 1969], No. 60988/69. Headings B3A and B3R. [Also in Division F1] A steam turbine blade having an erosion resistant shield 7 at the leading edge has a shim 8 interposed between the shield 7 and the blade body 3, the components being welded together to produce a ductile weld. In one arrangement blade body 3 is a stainless steel alloy, shim 8 a nickel-base chromium iron alloy and shield 7 a cobalt-base chromium tungsten alloy, the components being electron beam welded together. In a modification, body 3 is a titaniumalloy containing aluminium and vanadium and shim 8 pure titanium previously diffusion bonded to a shield 7 of the above specified composition. In a further arrangement, the latter shield 7 is replaced by a titanium base alloy including tin, aluminium, molybdenum and silicon electron beam welded to the shim 8. T.I.G. welding may be used in some cases.