Mr. Joni Reijonen is working as a Research Scientist at VTT Technical Research Centre of Finland Ltd. as part of the Advanced Manufacturing Technologies team in Espoo, Finland. He joined VTT in 2016 to do his Master’s Thesis on the utilization of metallic waste streams as raw material for additive manufacturing. He received his M.Sc. degree from Mechanical Engineering from Lappeenranta University of Technology in 2017. He’s research at VTT has focused on laser-material interactions in laser-powder bed fusion additive manufacturing, aiming at finding optimal process parameters for new alloys, understanding machine-to-machine variability and studying process-monitoring methods. Currently he is leading an EIT Raw Materials project 3DREMAG to develop a 3D printable permanent magnet powder.
Prosessimonitorointi jauhepetisulatuksen laadunvarmistuksessa
Quality assurance remains a challenge for the application of laser powder bed fusion additive manufacturing (L-PBF AM) for critical applications. The unique layer-by-layer nature of the building process enables in-situ process monitoring, providing the possibility of detecting the time and place of defects as they are formed. During recent years, process monitoring methods for L-PBF have been extensively developed, introduced to the market and their use for quality assurance researched. In this presentation, the main process monitoring methods for L-PBF are introduced and the current capabilities of correlating the monitoring signals with part defects (such as porosity) for the most developed solution, melt pool monitoring (MPM), are presented.