ADDRESSING THE LIMIT OF DETECTABILITY OF RESIDUAL OXIDE DISCONTINUITIES IN FRICTION STIR BUTT WELDS OF ALUMINUM USING PHASED ARRAY ULTRASOUND | Zendy

P.H. Johnston | Zendy; Donald O. Thompson | Zendy; Dale E. Chimenti | Zendy

Open Access

ADDRESSING THE LIMIT OF DETECTABILITY OF RESIDUAL OXIDE DISCONTINUITIES IN FRICTION STIR BUTT WELDS OF ALUMINUM USING PHASED ARRAY ULTRASOUND

Author(s) -

P.H. Johnston,

Donald O. Thompson,

Dale E. Chimenti

Publication year - 2009

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.177

H-Index - 75

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.3114191

Subject(s) - materials science , classification of discontinuities , noise (video) , oxide , acoustics , aluminium , residual , ultrasound , limit (mathematics) , phased array , scattering , planar , layer (electronics) , composite material , optics , metallurgy , computer science , engineering , physics , electrical engineering , mathematics , mathematical analysis , computer graphics (images) , algorithm , artificial intelligence , image (mathematics) , antenna (radio)

This activity seeks to estimate a theoretical upper bound of detectability for a layer of oxide embedded in a friction stir weld in aluminum. The oxide is theoretically modeled as an ideal planar layer of aluminum oxide, oriented normal to an interrogating ultrasound beam. Experimentally‐measured grain scattering level is used to represent the practical noise floor. Echoes from naturally‐occurring oxides will necessarily fall below this theoretical limit, and must be above the measurement noise to be potentially detectable.

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