Melt Pool Temperature Control for Laser Metal Deposition Processes—Part I: Online Temperature Control
- 21 January 2010
- journal article
- Published by ASME International in Journal of Manufacturing Science and Engineering
- Vol. 132 (1), 011010
- https://doi.org/10.1115/1.4000882
Abstract
Melt pool temperature is of great importance to deposition quality in laser metal deposition processes. To control the melt pool temperature, an empirical process model describing the relationship between the temperature and process parameters (i.e., laser power, powder flow rate, and traverse speed) is established and verified experimentally. A general tracking controller using the internal model principle is then designed. To examine the controller performance, three sets of experiments tracking both constant and time-varying temperature references are conducted. The results show the melt pool temperature controller performs well in tracking both constant and time-varying temperature references even when process parameters vary significantly. However a multilayer deposition experiment illustrates that maintaining a constant melt pool temperature does not necessarily lead to uniform track morphology, which is an important criteria for deposition quality. The reason is believed to be that different melt pool morphologies may have the same temperature depending on the dynamic balance of heat input and heat loss.Keywords
This publication has 6 references indexed in Scilit:
- Variable Powder Flow Rate Control in Laser Metal Deposition ProcessesJournal of Manufacturing Science and Engineering, 2008
- Melt pool temperature control using LabVIEW in Nd:YAG laser blown powder cladding processThe International Journal of Advanced Manufacturing Technology, 2005
- Thermal Behavior and Geometry Model of Melt Pool in Laser Material ProcessJournal of Heat Transfer, 2005
- Modelling the geometry of a moving laser melt pool and deposition track via energy and mass balancesJournal of Physics D: Applied Physics, 2004
- Process and Properties Control in Laser Aided Direct Metal/Materials Deposition ProcessPublished by ASME International ,2002
- Geometry Modeling and Control by Infrared and Laser Sensing in Thermal Manufacturing with Material DepositionJournal of Manufacturing Science and Engineering, 2000