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- W3137052012 abstract "In laser metal deposition (LMD) the height of the deposited track can vary within and between layers, causing significant deviations during the process evolution. This variation has been mainly attributed to temperature accumulation within the part due to the deposition trajectory and part geometry. Previous works have shown that in certain conditions a self-stabilizing process occurs, maintaining a deposit height and a constant standoff distance between the part and the deposition nozzle. In this work, the link between the powder catchment efficiency and the deposition height stability is illustrated. To this purpose, an experimental system consisting of an online measurement of the specimen weight and a coaxial optical triangulation monitoring of the layer height was employed. Through analytical modeling the inline height measurement and the process parameters could be used for estimating the deposition efficiency in real-time, which was confirmed by the direct mass measurements. The data were used for understanding how the powder catchment efficiency varied and stabilized as the process proceeded in different conditions. The results confirm that the track height variations are caused mainly by powder catchment efficiency, which is governed by the melt pool relative position with respect to the powder cone and the laser beam. For a given set of parameters, the standoff distance can be estimated to achieve the highest powder catchment efficiency and a regular height through the build direction." @default.
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- W3137052012 date "2021-03-22" @default.
- W3137052012 modified "2023-09-27" @default.
- W3137052012 title "Interplay between powder catchment efficiency and layer height in self-stabilized laser metal deposition" @default.
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