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The influence of shielding gas on the properties of laser welded stainless steel
University of Oulu, Oulu Southern Institute.
University of Oulu, Oulu Southern Institute.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0002-9010-1555
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
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2013 (English)In: 14th NOLAMP Conference: The 14th Nordic Laser Materials Processing Conference, August 26th – 28th 2013, Gothenburg, Sweden / [ed] Alexander Kaplan; Hans Engström, Luleå: Luleå tekniska universitet, 2013, p. 155-161Conference paper, Published paper (Other academic)
Abstract [en]

Argon is generally used as shielding gas for laser welding. As Argon is an inert gas it doesnot have influence on the microstructure of the weld material or on the heat input of the weld,whereas nitrogen has solubility to austenite. Therefore nitrogen as an interstitial atomincreases the hardness of the weld. This has been detected when comparing the hardnessprofiles of nitrogen shielded welds of austenitic stainless steel with Argon shielded welds.Nitrogen as the shielding gas can compensate the softer structure of the weld in workhardenedand nitrogen-alloyed steels.For the duplex stainless steel grades the nitrogen additions promote formation ofaustenite in the weld, which decreases the risk of lowered toughness. In this study theinfluence of nitrogen shielding gas on the strength of the laser weld has been examined. Thestrength of laser welds of nitrogen alloyed work-hardened stainless steel seems to be slightlybetter when using nitrogen shielding gas compared to welds for argon shielding gas. It hasalso been verified that nitrogen as shielding gas decreases the risk of weak toughness of laserwelded duplex stainless steel.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2013. p. 155-161
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-28298Local ID: 20cebdf2-acda-4ff3-89a2-bf12460b5daaISBN: 978-91-7439-688-1 (print)ISBN: 978-91-7439-689-8 (electronic)OAI: oai:DiVA.org:ltu-28298DiVA: diva2:1001493
Conference
Nordic Laser Materials Processing Conference : 26/08/2013 - 28/08/2013
Note
Godkänd; 2013; 20131210 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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