Powder bed irregularity and hot-spot detection in electron beam melting by means of in-situ video imaging. (April 2020)

• Record Type: Journal Article
• Authors: Grasso, Marco; Valsecchi, Giorgio; Colosimo, Bianca Maria
• Is Part Of: Manufacturing letters. Volume 24(2020)
• Page Start: 47
• Page End: 51
• Publication Date: 2020-04
• Subjects: Electron beam melting -- In-situ sensing -- In-situ monitoring -- Powder bed -- Hot-spot; Manufacturing industries -- Periodicals; Production engineering -- Periodicals; Manufacturing industries; Periodicals; 670
• DOI: 10.1016/j.mfglet.2020.03.011
• Languages: English
• ISSNs: 2213-8463

Abstract

Abstract: The electron beam melting process has been successfully applied in various sectors to produce high-value-added products. Being a hot process operating in vacuum environment with x-rays and material vaporization among by-products, in-situ sensing and monitoring presents more challenges than in laser powder bed fusion. However, an automated and robust detection of unstable process conditions represents a key capability to meet challenging qualification requirements imposed by industry. This study presents novel in-situ monitoring methods based on high spatial resolution imaging for powder bed homogeneity monitoring and high temporal resolution video-imaging for hot-spot detection, i.e., the detection of anomalous local heat accumulations.