Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Impact of multi-focus beam shaping on the process stability
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development. Bremer Institut fuer angewandte Strahltechnik GmbH, Bremen, Germany.
Bremer Institut fuer angewandte Strahltechnik GmbH, Bremen, Germany; University of Bremen, Bremen, Germany.
2019 (English)In: Optics and Laser Technology, ISSN 0030-3992, E-ISSN 1879-2545, Vol. 112, p. 278-283Article in journal (Refereed) Published
Abstract [en]

Unwanted process defects occur during laser deep penetration welding. The formation mechanisms of the main process defects like spatters and pores are not completely identified yet. Several methods like beam oscillation or laser power modulation are known to help reducing the occurrence of defects. These methods change the temporal energy input. It can be assumed that also beam shaping influences the energy input into the keyhole and has the potential to influence process defects as well. Due to the adapted energy input keyhole instabilities, that are assumed to influence the formation of the defects, can be avoided. A newly developed multi-focus beam shaping optic that creates multiple beam waists in axial direction is used in this work. The additional areas with increased intensities are used to modify the energy input in the keyhole in order to explain the mechanism of spatter formation and evaluate the potential of the axial beam shaping for defect suppression during laser deep penetration welding. It is found that the number of spatters can be reduced when the middle sections of the keyhole are illuminated with a high intensity. It can be concluded that spatters can be reduced when a keyhole collapse is avoided and a high enough energy input is guaranteed in the upper keyhole sections.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 112, p. 278-283
Keywords [en]
Laser deep penetration welding, Pore and spatter formation, Axial beam shaping, Multi-focus optic
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-71900DOI: 10.1016/j.optlastec.2018.11.032ISI: 000458941800035Scopus ID: 2-s2.0-85057245489OAI: oai:DiVA.org:ltu-71900DiVA, id: diva2:1268291
Note

Validerad;2019;Nivå 2;2018-12-05 (svasva)

Available from: 2018-12-05 Created: 2018-12-05 Last updated: 2019-03-11Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records BETA

Volpp, Joerg

Search in DiVA

By author/editor
Volpp, Joerg
By organisation
Product and Production Development
In the same journal
Optics and Laser Technology
Manufacturing, Surface and Joining Technology

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 16 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf