Detection of discontinuities in friction stir welded components.
"This work looks into the detection of two major types of flaws occurring in friction stir welds - advancing side wormholes and root side kissing bonds. The latter being a laminar type of defect, located towards the root of the weld, is more difficult to detect using nondestructive methods. Butt weld samples from a design of experiment matrix with imposed skin-to-skin gaps of known width at the joint were destructively examined and the discontinuities found in them were catalogued. A relationship defining the process parameter limit for wormhole-free welds is established. Further, samples from another design of experiment matrix of wormhole-free welds were nondestructively examined for root side kissing bonds using relatively low frequency eddy current. A statistically significant correlation is established between height of kissing bond and corresponding normalized reactive voltage. Finally, the detection capability of the eddy current method is quantified using two methods - Monte Carlo simulation and probability density functions of normalized reactive voltage for zero and non-zero flaw conditions. The latter approach provides a relationship between flaw size and detection capability"--Abstract, page iii.
Liou, Frank W.
Mechanical and Aerospace Engineering
M.S. in Manufacturing Engineering
U.S. Air Force Research Laboratory (Wright-Patterson Air Force Base, Ohio)
University of Missouri--Rolla
xiii, 72 pages
© 2006 Harsha Jyoti Phukan, All rights reserved.
Thesis - Citation
Eddy currents (Electric)
Welded joints -- Testing
Print OCLC #
Link to Catalog Record
Full-text not available: Request this publication directly from Missouri S&T Library or contact your local library.http://merlin.lib.umsystem.edu/record=b5792685~S5
Phukan, Harsha Jyoti, "Detection of discontinuities in friction stir welded components." (2006). Masters Theses. 5930.
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