Repair of after-service gas turbine hot section superalloy components provides considerable saving in life-cycle cost of engines. Whereas a number of methods have been used in the past to repair these superalloy components, wide gap brazing technology has provided a practical alternative to repair difficult-to-weld alloys with substantial damages. In this paper, the historical development of wide gap repair technologies is reviewed first. Subsequently, the recent development in utilizing a vertically laminated structure to repair a large and deep gap (up to 16 mm) in one brazing cycle will be discussed. The microstructure resulted from this repair scheme will be evaluated and compared with conventional wide gap braze with slurry and that of the Liburdi powder metallurgy (LPM™) process. It is observed that in conventional wide gap brazing with premixed slurry, the presence of intermetallic compounds can be effectively reduced by reducing the ratio of braze alloy to gap filler, which, however, also contributes to the increased occurrence of macroscopic voids in the wide gap joint. The LPM™ method, on the other hand, can achieve a macroscopically void-free repair of gap (up to 6 mm) and minimize the formation of intermetallics. By using a vertically laminated repair scheme it is shown that the process is able to repair a deeper gap (up to 16 mm) with no macroscopic defects and reduced intermetallic compounds.
Skip Nav Destination
Article navigation
January 2009
Research Papers
Wide Gap Braze Repair Using Vertically Laminated Repair Scheme
Doug Nagy,
Doug Nagy
Liburdi Turbine Services
, Dundas, ON, L9H 7K4, Canada
Search for other works by this author on:
Xiao Huang
Xiao Huang
Liburdi Turbine Services
, Dundas, ON, L9H 7K4, Canada
Search for other works by this author on:
Doug Nagy
Liburdi Turbine Services
, Dundas, ON, L9H 7K4, Canada
Xiao Huang
Liburdi Turbine Services
, Dundas, ON, L9H 7K4, CanadaJ. Eng. Gas Turbines Power. Jan 2009, 131(1): 012101 (7 pages)
Published Online: October 13, 2008
Article history
Received:
April 1, 2008
Revised:
April 2, 2008
Published:
October 13, 2008
Citation
Nagy, D., and Huang, X. (October 13, 2008). "Wide Gap Braze Repair Using Vertically Laminated Repair Scheme." ASME. J. Eng. Gas Turbines Power. January 2009; 131(1): 012101. https://doi.org/10.1115/1.2967496
Download citation file:
Get Email Alerts
Image-based flashback detection in a hydrogen-fired gas turbine using a convolutional autoencoder
J. Eng. Gas Turbines Power
Fuel Thermal Management and Injector Part Design for LPBF Manufacturing
J. Eng. Gas Turbines Power
An investigation of a multi-injector, premix/micromix burner burning pure methane to pure hydrogen
J. Eng. Gas Turbines Power
Related Articles
Effect of Tungsten Addition on the Nucleation of Borides in Wide Gap Brazed Joint
J. Eng. Gas Turbines Power (June,2010)
Brazing and Wide Gap Repair of X-40 Using Ni-Base Alloys
J. Eng. Gas Turbines Power (May,2008)
High Strength, Ductile Braze Repairs for Stationary Gas Turbine Components—Part II
J. Eng. Gas Turbines Power (August,2010)
Fast Epitaxial High Temperature Brazing of Single Crystalline Nickel Based Superalloys
J. Eng. Gas Turbines Power (May,2009)
Related Chapters
Part 2, Section II—Materials and Specifications
Companion Guide to the ASME Boiler & Pressure Vessel Code, Volume 1, Second Edition
Part 2, Section II—Materials and Specifications
Companion Guide to the ASME Boiler and Pressure Vessel Code, Volume 1, Third Edition
Wide Gap Diffusion Brazing Repair
Brazing Handbook, Volume 2, 6th Edition