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Minimization of distortions during Laser Welding of Ultra High Strength Steel
Swerea KIMAB, Sweden.
KTH, School of Industrial Engineering and Management (ITM), Production Engineering. KTH, Centres, XPRES, Excellence in production research. Volvo Cars, Sweden.ORCID iD: 0000-0002-9849-1754
KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Welding Technology. KTH, Centres, XPRES, Excellence in production research.ORCID iD: 0000-0002-6061-662X
2015 (English)In: Journal of laser applications, ISSN 1042-346X, Vol. 27, no S2, S29011Article in journal (Refereed) Published
Abstract [en]

Ultra high strength steels are frequently used within the automotive industry for several components. Welding of these components is traditionally done by resistance spot welding, but to get further productivity and increased strength, laser welding has been introduced in the past decades. Fusion welding is known to cause distortions due to built in stresses in the material. The distortions result in geometrical issues during assembly which become the origin of low joint quality due to gaps and misfits. U-beam structures of boron steel simulating B-pillars have been welded with laser along the flanges. Welding parameters and clamping have been varied to create different welding sequences and heat input generating a range of distortion levels. The distortions have been recorded dynamically with an optical measurement system during welding. In addition, final distortions have been measured by a digital Vernier caliper. The combined measurements give the possibility to evaluate development, occurrence, and magnitude of distortions with high accuracy. Furthermore, section cuts have been analyzed to assess joint geometry and metallurgy. The results show that final distortions appear in the range of 0–8 mm. Distortions occur mainly transversely and vertically along the profile. Variations in heat input show clear correlation with the magnitude of distortions and level of joint quality. A higher heat input in general generates a higher level of distortion with the same clamping conditions. Section cuts show that weld width and penetration are significantly affected by welding heat input. The present study identifies parameters which significantly influence the magnitude and distribution of distortions. Also, effective measures to minimize distortions and maintain or improve joint quality have been proposed. Finally, transient finite element (FE) simulations have been presented which show the behavior of the profiles during the welding and unclamping process.

Place, publisher, year, edition, pages
2015. Vol. 27, no S2, S29011
Keyword [en]
ultra high strength steel, boron steel, laser welding, distortions, finite element simulations
National Category
Mechanical Engineering
Research subject
SRA - Production
URN: urn:nbn:se:kth:diva-161927DOI: 10.2351/1.4906468ISI: 000350544500020ScopusID: 2-s2.0-84943625500OAI: diva2:796590
ICALEO 2014, 33rd International Congress on Applications of Lasers & Electro-Optics, October 19-23, San Diego, USA

QC 20150326

Available from: 2015-03-19 Created: 2015-03-19 Last updated: 2015-04-13Bibliographically approved

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Andersson, OscarMelander, Arne
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Production EngineeringXPRES, Excellence in production researchWelding Technology
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