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Visualization of the shielding gas flow in SLM machines by space-resolved thermal anemometry

 
: Schniedenharn, M.; Wiedemann, F.; Schleifenbaum, J.H.

:

Rapid Prototyping Journal 24 (2018), Nr.8, S.1296-1304
ISSN: 1355-2546
Englisch
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ILT ()

Abstract
Purpose
The purpose of this paper is to introduce an approach in measuring the shielding gas flow within laser powder bed fusion (L-PBF) machines under near-process conditions (regarding oxygen content and shielding gas flow).
Design/methodology/approach
The measurements are made sequentially using a hot-wire anemometer. After a short introduction into the measurement technique, the system which places the measurement probe within the machine is described. Finally, the measured shielding gas flow of a commercial L-PBF machine is presented.
Findings
An approach to measure the shielding gas flow within SLM machines has been developed and successfully tested. The use of a thermal anemometer along with an automated probe-placement system enables the space-resolved measurement of the flow speed and its turbulence.
Research limitations/implications
The used single-normal (SN) hot-wire anemometer does not provide the flow vectors’ orientation. Using a probe with two or three hot-films and an improved placement system will provide more information about the flow and less disturbance to it.
Originality/value
A measurement system which allows the measurement of the shielding gas flow within commercial L-PBF machines is presented. This enables the correlation of the shielding gas flow with the resulting parts’ quality.

: http://publica.fraunhofer.de/dokumente/N-524108.html