About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Equipment, Instrumentation and In-Situ Process Monitoring
|
| Presentation Title |
Effect of Beam Shaping on Ratio Pyrometric Temperatures in DED-LB/M |
| Author(s) |
Lova Chechik, Karen Schwarzkopf, Michael Schmidt |
| On-Site Speaker (Planned) |
Lova Chechik |
| Abstract Scope |
Ratio pyrometry is commonly used as a simple process monitoring technique in additive manufacturing, particularly in directed energy deposition of metals (DED-LB/M). Recent advances in beam shaping technology have added a new level of complexity to DED-LB/M. Using dynamic beam shaping, it is now possible to alter the beam shape at a high frequency with a constant total laser power. As a result, it is now possible to greatly alter the size and shape of the melt pool, whilst the total heat input can remain the same. How does a ratio pyrometer measure the temperature of these various melt pools when melt pool size and temperature vary independently? Computational methods are used to explain experimental results obtained when using a variety of beam shapes and laser powers. This work leads to a deeper understanding of how the pyrometer spot size dictates what information is provided by the ratio temperature. |