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Title: Relevance of single channel signals for two-colour pyrometer process monitoring of laser powder bed fusion

Authors: Kai Gutknecht; Michael Cloots; Konrad Wegener

Addresses: Irpd AG, Lerchenfeldstrasse 3, St. Gallen, CH-9014, Switzerland ' Irpd AG, Lerchenfeldstrasse 3, St. Gallen, CH-9014, Switzerland ' Institute of Machine Tools and Manufacturing (IWF), ETH Zürich, CH-8092 Zürich, Switzerland

Abstract: This paper discusses the relevance of two-colour pyrometers' single channel signals for process monitoring of laser powder bed fusion metal additive manufacturing. First, examples are presented where the ratio temperature provided by the pyrometer is misleading. Following is a demonstration that such instances can be uncovered by the single channel signals, where an approach for simplified signal analysis based on the working principles of the pyrometer is provided. In closing, a validation is implemented, where the careful inspection and employment of the single channel signals yielded suitable input for a successful closed-loop process control.

Keywords: additive manufacturing; laser powder bed fusion; pyrometer; process monitoring; process control.

DOI: 10.1504/IJMMS.2021.119152

International Journal of Mechatronics and Manufacturing Systems, 2021 Vol.14 No.2, pp.111 - 127

Received: 28 Mar 2021
Accepted: 17 Jul 2021
Published online: 25 Nov 2021 *