Keywords and Phrases
Additive manufacturing; Image processing; Infrared thermography; Process monitoring
"Laser metal deposition as an additive manufacturing technique has been proven to possess the capability for fabricating complex, intricate geometries and excellent material properties through material deposition. Accurate manufacture of such geometric features would require precise control over the material deposition process. The need of the hour are process monitoring and analyses mechanisms that are crucial in ascertaining the occurrence of the intended actions during deposition while also serving as effective learning tools. The current work involved developing and incorporating an Infra-Red (IR) camera as a process monitoring tool for laser metal deposition. Using the IR camera the thermal dynamics of the deposition processes under the control of the feedback systems were captured and analyzed to realize the changes in the material close to solidus temperature. The analysis confirmed the logic behind the control system and was successful in helping identify the ideal process parameters which were quantified using a set of experiments. The sub-sequent effort was focused on further disseminating thermographic data to attain details about the material above the solidus temperature. Employing image processing techniques pertaining to edge detection, regions that encompass the material above the solidus temperature were successfully identified. IR camera data was also used to track the regions of interest through the deposition and make other characteristic observations pertaining to phase change. To further test the sensitivity of this technique a series of experiments with varying power, track length and substrate size were performed. The developed methodology proved successful in identifying the regions of interest with a high degree of sensitivity and repeatability. Comprehensive insights into the physics of the process were also successfully obtained."--Abstract, page iii.
Liou, Frank W.
Newkirk, Joseph William
Kinzel, Edward C.
Materials Science and Engineering
M.S. in Manufacturing Engineering
Missouri University of Science and Technology. Department of Mechanical and Aerospace Engineering (Manufacturing Engineering)
Missouri University of Science and Technology
x, 53 pages
© 2015 Sreekar Karnati, All rights reserved.
Thesis - Open Access
Electronic OCLC #
Link to Catalog Record
Karnati, Sreekar, "Thermographic investigation of laser metal deposition" (2015). Masters Theses. 7402.