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Laser-arc hybrid welding of thick HSLA steel
Norwegian University of Science and Technology, Department of Industrial and Mechanical Engineering.
Norwegian University of Science and Technology, Department of Engineering Design and Materials.
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, Product and Production Development.ORCID iD: 0000-0002-3569-6795
2018 (English)In: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 259, p. 75-87Article in journal (Refereed) Published
Abstract [en]

A standard laser-arc hybrid welding (S-LAHW) and LAHW with preplaced cut wire inside the groove before welding were studied and compared. The S-LAHW setup revealed problems with filler wire delivery to the root, resulting in substantial hardness increase due to bainitic-martensitic transformation. The applied finite element modelling confirmed significant cooling rate increase in the root area for deep penetration welds. Preplacement of cut wire prior to welding reduced hardness providing improved welds with higher homogeneity. This method was subsequently applied for multi-pass welding that revealed insufficient nucleation of acicular ferrite on non-metallic inclusions (NMIs). It is implied that a critical cooling rate has been exceeded where the NMIs become inactive, resulting in a microstructure consisting of a martensite and bainite mixture. This kind of microstructure is clearly harmful for the weld metal toughness.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 259, p. 75-87
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-68544DOI: 10.1016/j.jmatprotec.2018.04.019Scopus ID: 2-s2.0-85045563495OAI: oai:DiVA.org:ltu-68544DiVA, id: diva2:1202694
Note

Validerad;2018;Nivå 2;2018-04-30 (andbra)

Available from: 2018-04-30 Created: 2018-04-30 Last updated: 2018-05-04Bibliographically approved

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CiteExportLink to record
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  • apa
  • harvard1
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  • de-DE
  • en-GB
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  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
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