Comparison of ex situ x-ray radiography and in situ monitoring to gain control over defects during laser powder bed fusion

Conference · Mon Aug 13 04:00:00 EDT 2018

OSTI ID:1476652

Forien, J B ^[1]; Depond, P ^[1]; Guss, G ^[1]; Jared, B ^[2]; Madison, J ^[2]; Garlea, Elena ^[3]; Choo, H ^[4]; Matthews, M ^[1]

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1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
3. Y-12 National Security Complex, Oak Ridge, TN (United States)
4. Univ. of Tennessee, Knoxville, TN (United States)

As in any other laser welding technique, creation of pores and defects during laser powder bed fusion can lead to component failure and thus cannot be tolerated. Post-build inspection is required to ensure the printed parts are defects-free. These inspections can take time and are complicated particularly for large parts. A solution is to use in situ process monitoring to detect the creation of defects, which could in turn be corrected during the printing itself. However, the relationship between pore creation and in situ monitoring still needs to be understood. In this work, we use x-ray computed tomography to detect pores and correlate them to pyrometry and high speed thermal imaging signals collected during laser welding.

• Research Organization: Oak Ridge Y-12 Plant (Y-12), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC52-07NA27344
• OSTI ID: 1476652
• Report Number(s): IROS5372
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY