Development of a spectroscopic process monitoring system for multi-laser metal powder bed fusion additive manufacturing
Open Access
Author:
Przyjemski, Andrew
Graduate Program:
Additive Manufacturing and Design
Degree:
Master of Science
Document Type:
Master Thesis
Date of Defense:
June 25, 2021
Committee Members:
Timothy Simpson, Program Head/Chair Abdalla Ramadan Nassar, Thesis Advisor/Co-Advisor David Jeffrey Corbin, Committee Member
Keywords:
additive manufacturing metal welding lasers process monitoring sensors spectroscopy optics emission photodiode defects flaws
Abstract:
Multi-laser powder bed fusion additive manufacturing (PBFAM) is the answer to the growing demand for faster and larger part production. However, timely and cost-effective part qualification remains a critical hurdle due to the formation of subsurface flaws during the PBFAM process. Spectroscopic inspired monitoring systems has been shown as a promising technique to detect the presence of flaws using the spectral emissions during the laser welding process. However, the use of spectroscopic sensing in PBFAM systems is complicated by the introduction of multiple simultaneously operating lasers. The work presented in this thesis covers the development of an optical emission spectroscopy inspired, photodiode-based system designed for use in multi-laser PBFAM. The objective of this system is to assist in the real time detection of flaws that form during the PBFAM process.
