Melt Pool Temperature Control for Laser Metal Deposition Processes-Part II: Layer-To-Layer Temperature Control
Abstract
Heat input regulation is crucial for deposition quality in laser metal deposition (LMD) processes. To control the heat input, melt pool temperature is regulated using temperature controllers. Part I of this paper showed that, although online melt pool temperature control performs well in terms of tracking the temperature reference, it cannot guarantee consistent track morphology. Therefore, a new methodology, known as layer-to-layer temperature control, is proposed in this paper. The idea of layer-to-layer temperature control is to adjust the laser power profile between layers. The part height profile is measured between layers, and the temperature is measured online. The data are then utilized to identify the parameters of a LMD process model using particle swarm optimization. The laser power profile is then computed using iterative learning control, based on the estimated process model and the reference melt pool temperature of the next layer. The deposition results show that the layer-to-layer temperature controller is capable of not only tracking the reference temperature, but also producing a consistent track morphology.
Recommended Citation
L. Tang and R. G. Landers, "Melt Pool Temperature Control for Laser Metal Deposition Processes-Part II: Layer-To-Layer 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/10.1115/1.4000883
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
