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Laser Weld Repair of Service Exposed IN738 and GTD111 Buckets

[+] Author Affiliations
Greg Frederick

EPRI-RRAC, Charlotte, NC

David Gandy

EPRI-Materials and Repair, Charlotte, NC

J. T. Stover

Consultant

Paper No. GT2002-30160, pp. 885-899; 15 pages
doi:10.1115/GT2002-30160
From:
  • ASME Turbo Expo 2002: Power for Land, Sea, and Air
  • Volume 1: Turbo Expo 2002
  • Amsterdam, The Netherlands, June 3–6, 2002
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3606-1 | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME

abstract

Repairs of gas turbine buckets (blades) are currently limited to the upper tip region of the airfoil where operating stresses are commonly low. This limitation is predicated upon the use of low strength welding filler materials and the use of high energy welding processes such as gas tungsten arc welding (GTAW). When bucket damage is located within parts of the airfoil subjected to higher stress levels, buckets are often scrapped or replaced, costing utilities/independent power producers millions of dollars. Advanced repair techniques which allow repairs at higher stress regions of the bucket airfoil will significantly reduce the need and costs of scrapping buckets. “Structural” repairs to higher stress areas of the airfoil will require the use of welding fillers with similar composition and strength to that of the bucket base alloy and improvements in repair processing.

Copyright © 2002 by ASME
Topics: Lasers , Maintenance

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