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Communication Dans Un Congrès Année : 2011

Defect Detection and Sizing in Laser-Welded Aluminum Welds, Using Laser-Generated Ultrasounds

Résumé

Embedded welding defects, such as porosity, cracks, are generally observed during laser welding of aluminum. Non Destructive Inspection (NDI) after processing could be a way of assuring an acceptable weld quality. Nowadays, NDI techniques to control the inside of a weld are often limited to X-Rays or ultrasounds. However, these techniques are expensive (X-rays) or not contact-less (ultrasounds) limiting the applicability. The present paper shows the use of a Laser Ultrasound (LU) technique to inspect porosities in 2-mm thick sheet lap welds. The LU technique implements a pulsed Nd:YAG laser to generate ultrasounds in the material and a heterodyne Nd:YAG laser interferometer to measure the echo. This contact-less technique improves the NDI flexibility in regard of the geometry and surface quality of analyzed components while increasing the inspection speed. First experimentations resulted in the detection of 2-mm holes drilled in bulk aluminum sheets and the measurement of the shape and size of these defects is possible. On-going investigation shows the applicability of the LU technique to detect porosities in aluminum laser welds. Finally, the use of signal processing is also carried out to increase, in a first step, the signal-to-noise ratio and therefore enhances the defect detection.
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Dates et versions

hal-01005425 , version 1 (12-06-2014)

Identifiants

  • HAL Id : hal-01005425 , version 1

Citer

Diot Gaël, Afia Kouadri-David, H. Walaszek, Laurent Dubourg, Jihed Flifla, et al.. Defect Detection and Sizing in Laser-Welded Aluminum Welds, Using Laser-Generated Ultrasounds. International Congress on Applications of Lasers & Electro-Optics (ICALEO), Oct 2011, Orlando, United States. Paper 408. ⟨hal-01005425⟩
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