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Formation mechanisms of pores and spatters during laser deep penetration welding
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development. Bremer Institut fuer angewandte Strahltechnik GmbH.ORCID iD: 0000-0003-0194-9018
2018 (English)In: Journal of laser applications, ISSN 1042-346X, E-ISSN 1938-1387, Vol. 30, article id 012002Article in journal (Refereed) Published
Abstract [en]

During laser deep penetration welding process, defects cannot be completely avoided yet. Due to the dynamic process, especially process pores and spatters occur. Keyhole dynamics are assumed to be responsible for the initiation of both pores and spatters. However, it is not completely clear yet how spatters and pores are formed. A semianalytical model of a keyhole is used to simulate dynamic keyhole properties of laser beam welding of aluminum. These are related to characteristics of spatters and pores occurring during laser deep penetration welding recorded using high-speed-imaging technique and x-ray analysis, respectively. Correlations of keyhole shapes and pore formation show that the volume underneath a keyhole collapse can be sufficient to capture the gas that is necessary for the formation of a pore and a keyhole expansion is not necessarily needed to produce the pores found in the weld seam. Calculated keyhole wall fluctuations are found to be not sufficient to detach spatters from the keyhole wall without additional forces from the melt pool.

Place, publisher, year, edition, pages
Laser Institute of America , 2018. Vol. 30, article id 012002
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-67087DOI: 10.2351/1.4993843ISI: 000426582100003Scopus ID: 2-s2.0-85038906988OAI: oai:DiVA.org:ltu-67087DiVA, id: diva2:1168327
Note

Validerad;2018;Nivå 2;2017-12-20 (andbra)

Available from: 2017-12-20 Created: 2017-12-20 Last updated: 2018-03-27Bibliographically approved

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CiteExportLink to record
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  • nn-NB
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Output format
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