Inspection of thick welded joints using laser-ultrasonic SAFT

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DOIResolve DOI: http://doi.org/10.1016/j.ultras.2016.04.001
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TypeArticle
Journal titleUltrasonics
ISSN0041-624X
Volume69
Pages236242
SubjectThick weld inspection; Laser ultrasonics; Synthetic aperture focusing technique
AbstractThe detection of defects in thick butt joints in the early phase of multi-pass arc welding would be very valuable to reduce cost and time in the necessity of reworking. As a non-contact method, the laser-ultrasonic technique (LUT) has the potential for the automated inspection of welds, ultimately online during manufacturing. In this study, testing has been carried out using LUT combined with the synthetic aperture focusing technique (SAFT) on 25 and 50 mm thick butt welded joints of steel both completed and partially welded. EDM slits of 2 or 3 mm height were inserted at different depths in the multi-pass welding process to simulate a lack of fusion. Line scans transverse to the weld are performed with the generation and detection laser spots superimposed directly on the surface of the weld bead. A CCD line camera is used to simultaneously acquire the surface profile for correction in the SAFT processing. All artificial defects but also real defects are visualized in the investigated thick butt weld specimens, either completed or partially welded after a given number of passes. The results obtained clearly show the potential of using the LUT with SAFT for the automated inspection of arc welds or hybrid laser-arc welds during manufacturing.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationEnergy, Mining and Environment; National Research Council Canada
Peer reviewedYes
IdentifierS0041624X16300117
NPARC number23000337
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Record identifier47f5c46b-4125-42d5-b6e3-3f4d7534ba1e
Record created2016-07-07
Record modified2016-07-07
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