An empirical model for overlapping bead geometry during laser consolidation

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Authors
  1. Munro, C.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN)
Abstract
Laser Consolidation (LC), an additive manufacturing technique using blown metal powder and a pulsed laser, requires selecting specific combinations of hatch spacing and layer thickness to achieve dimensional accuracy. Modelling of the LC process is preferred over trial and error for parameter selection, as it requires less time, material and effort. However, published models of overlapping beads describe only the deposit and fail to account for important features, such as the tendency for layer height to continually increase, dilution to decrease and capture efficiency to vary with increasing bead overlap. Here, an empirical model is described that accounts for all of these features and also predicts the geometry of remelted substrate. The model predictions are compared to measurements made on actual deposits in order to demonstrate its efficacy. This model represents a useful tool for optimizing hatch spacing and layer thickness for the LC process.

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Keywords
Laser powder deposition;Additive manufacturing;Cladding;Overlap
Report Number
DRDC-RDDC-2019-R007 — Scientific Report
Date of publication
01 Aug 2019
Number of Pages
30
DSTKIM No
CA049840
CANDIS No
810677
Format(s):
Electronic Document(PDF)

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