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Research Papers: NDE

Detection and Sizing of Defects in Complex Geometry Weld by Manual Ultrasonic Time of Flight Diffraction Inspection

[+] Author and Article Information
S. K. Nath1

Thermal Research Centre, Central Power Research Institute, Nagpur-441 111, Maharastra, Indiasknath2000@yahoo.com

Krishnan Balasubramaniam, C. V. Krishnamurthy

Department of Mechanical Engineering, and Centre for Nondestructive Evaluation, Indian Institute Technology, Madras, Chennai-600 036, Tamil Nadu, India

B. H. Narayana

Thermal Research Centre, Central Power Research Institute, Nagpur-441 111, Maharastra, India

1

Corresponding author.

J. Pressure Vessel Technol 131(5), 051501 (Jul 27, 2009) (9 pages) doi:10.1115/1.3141436 History: Received October 19, 2008; Revised February 24, 2009; Published July 27, 2009

The basic aim of this current research is to reliably detect and size defects in complex geometry welds using the well-known ultrasonic time of flight diffraction (TOFD) technique. A complex geometry weld specimen with various artificial defects was designed and fabricated. Different combinations of probe angles and probe center spacings were used in experiments for determining the optimum one. TOFD models were also developed for sizing the defects and experimentally verified.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Photograph showing a complex weld

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Figure 2

(a) Schematic of the complex geometry aluminum specimen containing vertical notches and grooves of various locations and sizes, (b) photograph of the specimen with EDM notches top side, and (c) bottom side

Grahic Jump Location
Figure 3

(a) Schematic of the Flawtech weld specimen containing flaws at various locations and (b) photograph of the Flawtech weld specimen

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Figure 4

The principle of TOFD technique in complex geometry weld for estimation of flaw height/depth: The receiver probe is positioned on the slant portion of the weld. (a) Crack is at the center of the weld, (b) crack is on the LHS of the weld, and (c) crack is on the RHS of the weld.

Grahic Jump Location
Figure 5

The principle of TOFD technique in complex geometry weld for estimation of flaw height/depth: The receiver probe is positioned on the horizontal portion of the weld. (a) Crack is at the center of the weld, (b) crack is on the LHS of the weld, and (c) crack is on the RHS of the weld.

Grahic Jump Location
Figure 6

Experimental set-up

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Figure 7

TOFD A-scan image in Case-A of various flaws in complex geometry weld specimen: (a) Flaw-A, (b) Flaw-B, (c) Flaw-C, (d) Flaw-E, (e) Flaw-G, (f) Flaw-H, and (g) Flaw-J

Grahic Jump Location
Figure 8

TOFD A-scan image in Case-A of various flaws in the Flawtech weld specimen: (a) Flaw No. 1 and (b) Flaw No. 2

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