High chromium content welding material to improve resistance of

Details High chromium content welding material to improve resistance of High chromium content welding material to improve resistance of

1996-06-24

1998-01-06

Verdier, Christopher

Fluid reaction surfaces (i.e., impellers)

Support mounting, carrier or fairing structure

298891, 298892, 219 7612, 228119, F01D 502, B23P 1500

Patent

active

057047650

ABSTRACT:
A low pressure steam turbine and generator low alloy steel disc rotors with extended useful life properties. A ring member of the disc rotor has disposed on it multiple weld layers of ferrous material, forming a weld region. The ring member is made of a low alloy ferrous metal alloy having less than about six weight percent alloying ingredients including chromium. The chromium content of the weld region increases overall from a portion of the weld region adjacent to the ring member to a portion of the weld region farthest from the ring member. This general increase is accomplished using weld metal of a single chromium concentration of between 9% and 17% chromium and varying the welding parameters.

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