Application of laser ultrasonic non-destructive evaluation technique to additive manufacturing
| Autor: | Henry Helvajian, Anthony J. Manzo, Shant Kenderian |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science business.industry 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences law.invention Characterization (materials science) Optics Experimental system law Nondestructive testing 0103 physical sciences Ultrasonic sensor Heterodyne detection Surface layer 0210 nano-technology business Spot welding |
| Zdroj: | Laser 3D Manufacturing III. |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.2219866 |
| Popis: | 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 ( >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. |
| Databáze: | OpenAIRE |
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