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Welding in the World

, Volume 62, Issue 3, pp 653–661 | Cite as

Development of laser ultrasonics inspection for online monitoring of additive manufacturing

  • Célia MillonEmail author
  • Arnaud Vanhoye
  • Anne-Françoise Obaton
  • Jean-Daniel Penot
Research Paper
Part of the following topical collections:
  1. Welding, Additive Manufacturing and Associated NDT

Abstract

The quality control of additive manufacturing (AM) parts and the repeatability of AM process are critical issues for the widespread of AM especially for aerospace and healthcare sectors. Due to production costs, there is a strong interest in reducing scrap rates and process monitoring. Laser ultrasonics is a promising technology that fits the constraints of AM online monitoring. This technique shows potential for inspecting the upper cord of the part during manufacturing, as it is a non-contact and nondestructive testing. The generation is produced by a brief laser impulse which heats up the material, inducing constraints that release into ultrasonic waves. Two generation modes can be encountered using lasers: thermoelastic and ablative, depending on the energy deposited on the surface. The generated waves interact with the medium and flaws, thus allowing the detection of defects such as lack of fusion or porosities. The detection is performed using a two-wave mixing interferometer, also contactless. In this paper, we present work carried out in order to evaluate the feasibility and the effectiveness of laser ultrasonics testing for online additive manufacturing process. The influence of key parameters such as laser spot dimensions is highlighted through both experiment and modeling. We present first results obtained on additive manufactured parts containing machined notches.

Keywords

Laser ultrasonics Additive manufacturing Online process Direct metal deposition Direct energy deposition 

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Copyright information

© International Institute of Welding 2018

Authors and Affiliations

  1. 1.Commissariat à l’Energie AtomiqueParisFrance
  2. 2.Laboratoire National de Métrologie et d’EssaisParisFrance

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