Patent ID: 6454531
Filing Date: 2002-09-24
Classification: B23K,F01D

Abstract:
A steam turbine rotor comprising:a first steam turbine rotor forging of a first alloy, having a first end and a first diameter; a second steam turbine rotor forging of a second alloy significantly different than said first alloy having a second end and a second diameter; said first and second ends contoured so as to provide first and second central portions, respectively, having third and fourth diameters, respectively, less than said first and second diameters, and first and second contoured portions, respectively, radially outward of said first and second central portions, respectively; said first and second central portions joined by a first weld comprising a friction, inertia, or electroslag weld; and said first and second contoured portions joined by a second weld comprising an arc weld.