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Ultraviolet excitation for thermography inspection of surface cracks in welded joints
University West, Department of Engineering Science, Division of Automation Systems. (PTW)ORCID iD: 0000-0001-6933-375X
University West, Department of Engineering Science, Division of Automation Systems. (PTW)ORCID iD: 0000-0001-7748-0565
GKN Aerospace Engine System, Trollhättan.
2014 (English)In: Nondestructive Testing and Evaluation, ISSN 1058-9759, E-ISSN 1477-2671, Vol. 29, no 4, p. 332-344Article in journal (Refereed) Published
Abstract [en]

Infrared thermography is a non-contact and full field inspection method which has proven to be suitable for automatic surface crack detection. For automatic analysis of the inspection results, a high signal-to-noise ratio (SNR) is required. In this paper an alternative excitation method, using ultraviolet (UV) illumination, is presented and evaluated. Artificial surface defects, so-called notches, in a titanium plate are detected both in the weld seam and in the heat affected zone. Notches with a size from 80 mm in width and 250 mm in length are detected. The SNR using UV illumination is compared with that using flash lamp excitation. The results show that UV illumination using a mercury lamp is a good alternative as excitation source for thermography when detecting surface cracks. To validate the excitation method, results from real surface cracks are included.

Place, publisher, year, edition, pages
Taylor & Francis Group, 2014. Vol. 29, no 4, p. 332-344
Keywords [en]
Thermography inspection, surface cracks, weld inspection, excitation source, mercury lamp
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-6503DOI: 10.1080/10589759.2014.941842ISI: 000342322500005Scopus ID: 2-s2.0-84907592461OAI: oai:DiVA.org:hv-6503DiVA, id: diva2:738571
Projects
G5-Demo
Funder
VINNOVAAvailable from: 2014-08-18 Created: 2014-08-18 Last updated: 2017-12-05Bibliographically approved

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Runnemalm, AnnaBroberg, Patrik

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