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Phenomena in material addition to laser generated melt pools
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development. (Manufacturing Systems Engineering)ORCID iD: 0000-0002-7213-0002
2019 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2019.
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Keywords [en]
laser metal deposition, additive manufacturing, laser welding, multi-material, high speed imaging, powder incorporation, off-axis wire feed, streak imaging, laser cladding, absorptivity
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-73754ISBN: 978-91-7790-378-9 (print)ISBN: 978-91-7790-379-6 (electronic)OAI: oai:DiVA.org:ltu-73754DiVA, id: diva2:1306749
Presentation
2019-06-20, E632, lulea tekniska universitet, Lulea, 09:00 (English)
Opponent
Supervisors
Available from: 2019-04-25 Created: 2019-04-24 Last updated: 2019-06-05Bibliographically approved
List of papers
1. The stability of laser welding with an off-axis wire feed
Open this publication in new window or tab >>The stability of laser welding with an off-axis wire feed
2019 (English)In: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 264, p. 84-90Article in journal (Refereed) Published
Abstract [en]

The concept using an off-axis filler wire during laser welding is introduced here in order to provide added process robustness considering gap width variations. Its stability is investigated with respect to gap width, welding speeds and powers. Geometry of the welds is analysed by tracing of weld cap edges and joint cross sections, connecting trends to weld parameters. High speed imaging and streak images are used to further study and describe sequences of events, including undercut formation. Formation of imperfections are found to be mainly correlated to wire feed position variations at the surface due to irregular melting of the wire tip.

Place, publisher, year, edition, pages
Elsevier, 2019
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-70826 (URN)10.1016/j.jmatprotec.2018.09.003 (DOI)000450135400009 ()2-s2.0-85053062410 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-09-21 (svasva)

Available from: 2018-09-11 Created: 2018-09-11 Last updated: 2019-04-24Bibliographically approved
2. Powder catchment in laser metal deposition
Open this publication in new window or tab >>Powder catchment in laser metal deposition
2019 (English)In: Journal of laser applications, ISSN 1042-346X, E-ISSN 1938-1387, Vol. 31, no 2, article id 022308Article in journal (Refereed) Published
Abstract [en]

Laser metal deposition (LMD) of Inconel 718 using a coaxial nozzle is investigated by high-speed imaging. The interaction of individualpowder grains with the laser induced melt pool surface and, finally, their catchment in the LMD track is observed. Powder catchment trendsare explained by interpreting physical phenomena, such as the melt flow and surface tension. Distinct zones for powder catchment are categorizeddepending on the position of initial interaction between powder grains and the melt pool. Particles are introduced outside the meltpool ricochet and do not attach to the clad. Particles arriving outside the laser spot, onto the solidifying skin of the melt pool, are caught,and may incorporate. Some particles may remain on the clad surface as surface roughness on the built part. Particles interacting with thelaser-irradiated region of the melt pool tend to move toward its center and readily incorporate into the melt. Quantitative analyses of highspeedvideos are carried out to measure incorporation time of powder grains in the melt pool, their velocity, and distance traveled.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
Keywords
laser metal deposition, additive manufacturing, high-speed imaging, powder catchment mechanisms, blown powder, laser cladding
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-73750 (URN)10.2351/1.5096130 (DOI)000484435200038 ()2-s2.0-85064609365 (Scopus ID)
Conference
37th International Congress of Applications of Lasers & Electro-Optics (ICALEO 2018). 14-18 October 2018, Orlando, Florida
Note

Konferensartikel i tidskrift

Available from: 2019-04-24 Created: 2019-04-24 Last updated: 2019-10-01Bibliographically approved
3. Laser Metal Deposition of copper on diverse metals using green laser sources
Open this publication in new window or tab >>Laser Metal Deposition of copper on diverse metals using green laser sources
(English)In: Article in journal (Refereed) Submitted
Keywords
Copper, Laser Metal Deposition, Additive Manufacturing, High Speed Imaging, Multi-material, Green 515 nm laser, Directed Energy Deposition, Absorptivity, Powder grain incorporation, LMD, DED
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:ltu:diva-73753 (URN)
Note

The paper is soon to be submitted

Available from: 2019-04-24 Created: 2019-04-24 Last updated: 2019-04-24

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Citation style
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