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Porosity and solidification cracking in welded 45 mm thick steel by fiber laser-MAG process
SINTEF Industry, Trondheim, Norway.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling.ORCID-id: 0000-0003-4265-1541
SINTEF Industry, Trondheim, Norway.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling.ORCID-id: 0000-0002-3569-6795
Vise andre og tillknytning
2019 (engelsk)Inngår i: Procedia Manufacturing, E-ISSN 2351-9789, Vol. 36, s. 101-111Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Porosity and solidification cracking in joining of thick sections are very common issues in deep penetration keyhole laser-arc hybrid welding (LAHW). In the present work, 45 mm thick high strength steel was joined by a double-sided technique. With combined use of fast welding speeds and larger air gap between plates, higher amount of porosity was found because of the dynamic behavior of the keyhole walls. Solidification cracking formed at the centerline in the bottom of the weld due to high-depth-to-width geometrical ratio. Numerical simulations have been performed and showed very high cooling rate and stresses occurred in the root of the deep welds, which corresponds with higher cracking tendency.

sted, utgiver, år, opplag, sider
Elsevier, 2019. Vol. 36, s. 101-111
Emneord [en]
Laser welding, hybrid welding, solidification cracking, porosity, thick steel, mechanical properties
HSV kategori
Forskningsprogram
Produktionsutveckling
Identifikatorer
URN: urn:nbn:se:ltu:diva-75764DOI: 10.1016/j.promfg.2019.08.015OAI: oai:DiVA.org:ltu-75764DiVA, id: diva2:1346988
Konferanse
17th Nordic Laser Materials Processing Conference (NOLAMP17), 27-29 August, 2019, Trondheim, Norway
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Tilgjengelig fra: 2019-08-29 Laget: 2019-08-29 Sist oppdatert: 2019-08-29bibliografisk kontrollert

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