Effect of scanning speed and gas flow rate on surface roughness of LMD titanium-alloy

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1 Citation (Scopus)


This study investigated the effect of scanning speed and gas flow rate on surface finish produced during the laser metal deposition process of Ti6A14V, an important aerospace alloy. In this work, Nd-YAG laser was employed with coaxial powder deposition nozzle attached to the end effector of a Kuka robot. The laser power was maintained at 3.0 kW and the powder flow rate at a value 2.88 g/min. The scanning speed was varied between 0.01 and 0.05 m/s and the gas flow rate was varied between 1 and 5 I/min. A total of ten samples were produced and the surface roughness was measured using the average of five measurements from each sample. The microstructure was also studied with optical microscope to relate it to the surface roughness. The results showed that, the average surface finish increased as the scanning speed was increased. Conversely, as the gas flow rate was increased the average surface roughness was reduced. In optimizing the laser metal deposition process, the processing parameters need to be optimized. The results from this study will assist in choosing the right powder flow rate and scanning speed especially in applications such as repair and surface modification.

Original languageEnglish
Title of host publicationProceedings of the World Congress on Engineering and Computer Science 2016
EditorsS. I. Ao, Craig Douglas, Warren S. Grundfest
PublisherNewswood Limited
Number of pages5
ISBN (Electronic)9789881404824
Publication statusPublished - 21 Oct 2016
Externally publishedYes
Event2016 World Congress on Engineering and Computer Science, WCECS 2016 - San Francisco, United States
Duration: 19 Oct 201621 Oct 2016

Publication series

NameLecture Notes in Engineering and Computer Science
ISSN (Print)2078-0958


Conference2016 World Congress on Engineering and Computer Science, WCECS 2016
Country/TerritoryUnited States
CitySan Francisco

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