Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2007-10-02
2007-10-02
Williams, Hezron (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
C073S600000, C073S602000, C073S622000
Reexamination Certificate
active
11111438
ABSTRACT:
A method for ultrasonically inspecting a generator field tooth for the detection, characterization and/or sizing of cracks thereat is disclosed. An electromagnetic acoustic transducer (EMAT) productive of a test signal having a defined angle of refraction with respect to the tooth material is selected. The EMAT is positioned at an outer surface of the tooth absent a fluid couplant and oriented so as to direct the test signal to propagate through the tooth toward a load surface of the tooth where a butt joint of a set of wedges is disposed. The EMAT is activated so as to test the load surface proximate the butt joint for cracks thereat.
REFERENCES:
patent: 4457176 (1984-07-01), Scholz
patent: 4685334 (1987-08-01), Latimer
patent: 5329230 (1994-07-01), Viertl et al.
patent: 5652389 (1997-07-01), Schaps et al.
patent: 5811682 (1998-09-01), Ohtani et al.
patent: 5895856 (1999-04-01), Johnson et al.
patent: 6079273 (2000-06-01), Latimer et al.
patent: 6109108 (2000-08-01), Ohtani et al.
patent: 6119522 (2000-09-01), Johnson et al.
patent: 6170336 (2001-01-01), Johnson et al.
patent: 6282964 (2001-09-01), Hancock et al.
patent: 6732587 (2004-05-01), Lorraine et al.
patent: 6823736 (2004-11-01), Brock et al.
patent: 6854332 (2005-02-01), Alleyne
patent: 6896171 (2005-05-01), Den Boer et al.
patent: 6993971 (2006-02-01), Bossi et al.
patent: 7026943 (2006-04-01), Knowles et al.
patent: 2004/0244490 (2004-12-01), Turner
Ito, Hiromichi, “Slot Dovetail Inspections and Crack Growth Analysis in Turbo-generator Rotor Shaft”, Electric Power Research Institute, Inc.; Winter 2005.
Zayicek, P., “Phased Array Ultrasonic Technique for Rotor Dovetail Inspection”, Electric Power Research Institute, Inc.; 2004.
Cantor & Colburn LLP
General Electric Company
Saint-Surin Jacques M.
Williams Hezron
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