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Research Papers: NDE

Application of Microfocus Rod Anode in Qualification of Tube-to-Tube-Sheet Welds in Steam Generators

[+] Author and Article Information
P. R. Vaidya

Quality Assurance Division, Bhabha Atomic Research Centre, Mumbai 400 085, Indiaprvaidya@gmail.com

D. Narain

Light Water Reactor Division, Bhabha Atomic Research Centre, Mumbai 400 085, Indiadnarainy@yahoo.com

Sunil Kumar

 Larsen & Toubro Ltd., Saki Vihar Road, Powai, Mumbai 400072, Indiasunil.suri@hed.ltindia.com

J. Pressure Vessel Technol 132(5), 051502 (Aug 25, 2010) (3 pages) doi:10.1115/1.4001433 History: Received August 07, 2009; Revised March 09, 2010; Published August 25, 2010; Online August 25, 2010

Tube-to-tube-sheet (TTS) welds, occurring in heat exchangers, condensers, and steam generators, are exempted from volumetric nondestructive examination, such as radiography or ultrasonic tests, due to their geometry. An approach of stricter quality control at qualification stage is adopted, apart from tests like liquid penetrant test and leak test applied to production welds. For qualification purpose, a mock up block is destructively examined for weld quality by microscopy and/or macroscopic examination. This paper shows that it is possible to carry out radiography of TTS welds using microfocal x-ray unit with back-throw type rod anode attachment, which sends radiation in nearly radial direction. It demonstrates the use of the same technique for the qualification weld block also. It further shows that the qualification weld slices can be radiographed in axial direction to enable 100% volumetric examination. Besides, it will make metallography more effective and meaningful; instead of a random section, it can then address the plane with a flaw using the help from radiography test. The paper suggests that the code adopt radiography in addition to metallography during qualification for better quality assurance.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Typical weld joint under study

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Figure 2

Radiographic arrangement with microfocal rod anode

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Figure 3

Radiographs at L2 of 5 mm: (a) L1=5 mm and (b) L1=6 mm

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Figure 4

Image of wire used as penetrameter

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Figure 5

Making a slice out of weld volume for axial RT

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Figure 6

Axial Radiograph of the weld slice

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Figure 7

Macrograph of the weld slice

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