Power plant piping operating at elevated temperatures is subject to several types of service aging-related degradation, such as softening, spheroidization, embrittlement, and creep. When cracks are found in these components, weld repair is often employed to ensure continued operation. The efficacy of the weld repairs in terms of extending the life of the aged components has, however, not been documented quantitatively. The Electric Power Research Institute (EPRI) has recently undertaken a comprehensive study to evaluate weld repairs performed to aged piping. In connection with this study, results from other worldwide activities have been reviewed, leading to significant conclusions regarding weld repair. This review of results from several worldwide studies has confirmed that aged high-temperature piping can be successfully weld repaired to gain additional lives in excess of several decades. The key aspects of successful weld repair include excavation and removal of all prior creep cavitation damage, elimination of external bending stresses, and implementation of good welding practice. From merely a creep rupture point of view, postweld heat treatment (PWHT) has been concluded to be superfluous by several authors. Temperbead repairs appear to offer a promising alternative to PWHT repairs from a creep, tensile, and toughness standpoint. Choice of the repair process ultimately is dictated by many considerations such as toughness, notch sensitivity, residual stresses and hydrogen embrittlement susceptibility. Several reports suggest that gas tungsten arc welding (GTAW) repairs may outperform shielded metal arc welding (SMAW) repairs with or without PWHT. [S0094-9930(00)02001-1]
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February 2000
Technical Papers
Weld Repair of Aged Cr-Mo Steel Piping—A Review of Literature
R. Viswanathan, Technical Fellow,,
R. Viswanathan, Technical Fellow,
Electric Power Research Institute, 3412 Hillview Avenue, Palo Alto, CA 94304-1395
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D. Gandy, Manager,
D. Gandy, Manager,
Materials and Fossil Application Repair and Replacement Applications Center, Electric Power Research Institute, Charlotte, NC 28262
Search for other works by this author on:
R. Viswanathan, Technical Fellow,
Electric Power Research Institute, 3412 Hillview Avenue, Palo Alto, CA 94304-1395
D. Gandy, Manager,
Materials and Fossil Application Repair and Replacement Applications Center, Electric Power Research Institute, Charlotte, NC 28262
Contributed by the Pressure Vessels and Piping Division (Joint w/JCPVT) and presented at the Pressure Vessels and Piping Conference, Boston, Massachusetts, August 1–5, 1999, of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS. Manuscript received by the PVP Division, September 10, 1999; revised manuscript received October 26, 1999. Technical Editor: S. Y. Zamrik.
J. Pressure Vessel Technol. Feb 2000, 122(1): 76-85 (10 pages)
Published Online: October 26, 1999
Article history
Received:
September 10, 1999
Revised:
October 26, 1999
Citation
Viswanathan , R., and Gandy , D. (October 26, 1999). "Weld Repair of Aged Cr-Mo Steel Piping—A Review of Literature ." ASME. J. Pressure Vessel Technol. February 2000; 122(1): 76–85. https://doi.org/10.1115/1.556154
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