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Observation of the mechanisms causing two kinds of undercut during laser hybrid arc welding
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0003-4265-1541
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics.ORCID iD: 0000-0002-3569-6795
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
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2011 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 257, no 17, p. 7501-7506Article in journal (Refereed) Published
Abstract [en]

Two different kinds of undercut were identified when laser hybrid welding hot rolled HSLA-steel in either the as-rolled condition or with the top surface mill scale removed. The presence of mill scale on the steel surface was found to give a sharp angled undercut combined with a sharp oxide inclusion at the edge of the weld which would have the same mechanical effect as a crack in this position. Removal of the surface oxides before welding resulted in the elimination of the oxide inclusions and a more rounded undercut geometry indicative of superior mechanical properties, particularly fatigue life. The mechanisms of the formation of both types of undercut have been analysed by high speed photography and SEM.

Place, publisher, year, edition, pages
2011. Vol. 257, no 17, p. 7501-7506
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-4307DOI: 10.1016/j.apsusc.2011.03.068ISI: 000290790900024Scopus ID: 2-s2.0-79957454687Local ID: 23cf4b4d-15ea-40b3-b9e3-8f19ce9975b1OAI: oai:DiVA.org:ltu-4307DiVA, id: diva2:977171
Note
Validerad; 2011; 20110425 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Karlsson, JanNorman, PeterKaplan, AlexanderRubin, Per

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