Melt Pool Temperature Control for Laser Metal Deposition Processes-Part I: Online Temperature Control
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.
Recommended Citation
L. Tang and R. G. Landers, "Melt Pool Temperature Control for Laser Metal Deposition Processes-Part I: Online Temperature Control," Journal of Manufacturing Science and Engineering, American Society of Mechanical Engineers (ASME), Jan 2010.
The definitive version is available at https://doi.org/10.1115/1.4000882
Department(s)
Mechanical and Aerospace Engineering
International Standard Serial Number (ISSN)
1087-1357
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2010 American Society of Mechanical Engineers (ASME), All rights reserved.
Publication Date
01 Jan 2010
