| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Additive Manufacturing: Equipment, Instrumentation and Measurement
|
| Presentation Title |
Optical Emission Sensing for Laser-based Additive Manufacturing – What Are We Actually Measuring? |
| Author(s) |
Christopher B. Stutzman, Abdalla Nassar, Wesley Mitchell |
| On-Site Speaker (Planned) |
Christopher B. Stutzman |
| Abstract Scope |
Additive manufacturing is a rapidly growing industry in which complex components can be produced directly from a CAD file. While this process can easily produce complex components, the propensity for defect formation is not small. Therefore it is important to develop sensing procedures to ensure that quality components are produced. Traditionally, melt pool imaging has been a source of significant interest due to the assumption that one could measure the geometry of the melt pool and more fully understand the build process. Unfortunately, the co-axial camera data is not always interpreted correctly. Here, we show that under some conditions, melt pool measurements produced from a coaxial camera do not accurately estimate the melt pool. Further, using an off-axis camera filtered to observe excited titanium plume emissions, we show that the excited vapor plume above the melt pool significantly obscures measurements, particularly at high energy. |