Masters Theses
Detection of discontinuities in friction stir welded components.
Abstract
"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.
Advisor(s)
Richards, Von
Committee Member(s)
Liou, Frank W.
Krishnamurthy, K.
Department(s)
Mechanical and Aerospace Engineering
Degree Name
M.S. in Manufacturing Engineering
Sponsor(s)
Boeing Company
U.S. Air Force Research Laboratory (Wright-Patterson Air Force Base, Ohio)
Publisher
University of Missouri--Rolla
Publication Date
Summer 2006
Pagination
xiii, 72 pages
Rights
© 2006 Harsha Jyoti Phukan, All rights reserved.
Document Type
Thesis - Citation
File Type
text
Language
English
Subject Headings
Eddy currents (Electric)Friction weldingNondestructive testingWelded joints -- Testing
Thesis Number
T 9037
Print OCLC #
85775121
Recommended Citation
Phukan, Harsha Jyoti, "Detection of discontinuities in friction stir welded components." (2006). Masters Theses. 5930.
https://scholarsmine.mst.edu/masters_theses/5930
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