Laser Additive Manufacturing of Monel K500 – Effects of Pulsed Laser Parameters on Bead Shape

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Authors
  1. Munro, C.
  2. Chambers, N.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN);Dalhousie Univ, Halifax NS (CAN)
Abstract
A study was conducted to understand the relationship between pulsed laser parameters and bead geometric characteristics during blown-powder laser additive manufacturing (LAM). This study was necessary as there are conflicting reports in the literature regarding whether the individual laser parameters control bead shape, or whether shape is controlled by the average laser power. Monel K500 powder was deposited on Monel K500 bar stock using a variety of laser parameters (viz., pulse duration, peak power and pulse frequency). This bar was cut, polished and etched in a manner that allowed the retrieval of cross-sectional views of the deposited beads. The measurements of these beads (viz., bead height, clad width, wetting angle, dilution and powder catchment efficiency) were subjected to statistical analysis. Statistical analysis of variance and t-tests showed that the laser peak power consistently had a significant, unique influence on the geometry of the deposited bead, even when the average laser power and other parameters were kept constant. The results suggest that the individual pulsed laser parameters do indeed affect bead shape, and therefore it is not sufficient to merely consider average laser power during a LAM build.

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Keywords
laser additive manufacturing;Monel K500;pulsed laser parameters;cladding
Report Number
DRDC-RDDC-2015-R067 — Scientific Report
Date of publication
01 May 2015
Number of Pages
54
DSTKIM No
CA040754
CANDIS No
801819
Format(s):
Electronic Document(PDF)

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