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Proceedings Paper

Application of laser ultrasonic non-destructive evaluation technique to additive manufacturing
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Paper Abstract

The change in properties of a propagating ultrasonic wave has been a mainstay characterization tool of the nondestructive evaluation (NDE) industry for identifying subsurface defects (e.g. damage). A variant of this concept could be applicable to 3D additive manufacturing where the existence of defects (e.g. pores) within a sub-layer could mark a product as non-qualifying. We have been exploring the utility of pulsed laser ultrasonic excitation coupled with CW laser heterodyne detection as an all optical scheme for characterizing sub surface layer properties. The all-optical approach permits a straight forward integration into a laser additive processing tool. To test the concept, we have developed an experimental system that generates pulsed ultrasonic waves (the probe) with high bandwidth (<<10MHz) and a surface displacement sensor that can capture the ultrasonic "return" signal with bandwidth close to 300 MHz. The use of high frequencies enables the detection of smaller defect sites. The technique is time resolved with the sensor and probe as point (>>30-200 microns) beams. Current tests include characterizing properties of spot weld joints between two thin stainless steel plates. The long term objective is to transition the technique into a laser additive manufacturing tool.

Paper Details

Date Published: 6 April 2016
PDF: 7 pages
Proc. SPIE 9738, Laser 3D Manufacturing III, 973810 (6 April 2016); doi: 10.1117/12.2219866
Show Author Affiliations
Anthony J. Manzo, The Aerospace Corp. (United States)
Shant Kenderian, The Aerospace Corp. (United States)
Henry Helvajian, The Aerospace Corp. (United States)

Published in SPIE Proceedings Vol. 9738:
Laser 3D Manufacturing III
Bo Gu; Henry Helvajian; Alberto Piqué, Editor(s)

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