Within the Collaborative Research Centre 561, “Thermally highly loaded, porous and cooled multilayer systems for combined cycle power plants,” open-porous and high-temperature stable Ni-based structures are being developed for the requirements of effusion cooling. A two-dimensional cooling strategy for the walls of combustion chambers, which allows the outflow of the cooling medium over the complete wall area of the combustion chamber, could be realized by an open-porous metallic foam structure. The open-porous metallic foam is produced by the “slip reaction foam sintering” process, a powder metallurgical process. To join several foams to assemble structural elements, laser beam welding has been used. Different joining strategies have been examined to find out the most suitable method to join these foams. In this paper, the process setups, settings of the different strategies, and results of trials (seam geometry and strength tests) are discussed. The need for graded structures to combine the essential permeability and adequate weldability is also shown.
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Laser Beam Welding of Open-Porous Metallic Foams for Application in Cooling Structures of Combined Cycle Power Plants
Uwe Reisgen,
Uwe Reisgen
Welding and Joining Institute (ISF),
RWTH Aachen University
, Aachen NRW D-52062, Germany
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Simon Olschok,
Simon Olschok
Welding and Joining Institute (ISF),
RWTH Aachen University
, Aachen NRW D-52062, Germany
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Stefan Longerich
Stefan Longerich
Welding and Joining Institute (ISF),
RWTH Aachen University
, Aachen NRW D-52062, Germany
Search for other works by this author on:
Uwe Reisgen
Welding and Joining Institute (ISF),
RWTH Aachen University
, Aachen NRW D-52062, Germany
Simon Olschok
Welding and Joining Institute (ISF),
RWTH Aachen University
, Aachen NRW D-52062, Germany
Stefan Longerich
Welding and Joining Institute (ISF),
RWTH Aachen University
, Aachen NRW D-52062, GermanyJ. Eng. Gas Turbines Power. May 2010, 132(5): 054502 (5 pages)
Published Online: March 3, 2010
Article history
Received:
March 20, 2009
Revised:
April 27, 2009
Online:
March 3, 2010
Published:
March 3, 2010
Citation
Reisgen, U., Olschok, S., and Longerich, S. (March 3, 2010). "Laser Beam Welding of Open-Porous Metallic Foams for Application in Cooling Structures of Combined Cycle Power Plants." ASME. J. Eng. Gas Turbines Power. May 2010; 132(5): 054502. https://doi.org/10.1115/1.3204512
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