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Distortion Analysis in Laser Welding of Ultra High Strength Steel
Swerea KIMAB.ORCID iD: 0000-0001-8933-6720
KTH Royal Institute of Technology.
Volvo Car Corporation.
Swerea KIMAB.
Show others and affiliations
2014 (English)In: Proceedings of the 6th International Swedish Production Symposium 2014 / [ed] Stahre, Johan, Johansson, Björn & Björkman, Mats, 2014, 1-9 p.Conference paper, Published paper (Refereed)
Abstract [en]

Due to increased demands on reduced weight in automotive industries, the use of ultra high strength steels (UHSS) has increased. When laser welding UHSS sheets, heating and cooling of the material will cause geometrical distortions and may cause low joint quality. 700 mm long U-beam structures of 1 mm thick boron steel simulating structural pillars in body-in-white constructions have been welded along the flanges with different welding speeds to investigate distortions and weld quality. The results show that final distortions appear in the range of 0-8 mm. FE simulation methods have also been presented which generally predict the distribution of welding distortions.

Place, publisher, year, edition, pages
2014. 1-9 p.
Keyword [en]
Laser welding, distortion, UHSS, simulation, automotive
National Category
Materials Engineering Production Engineering, Human Work Science and Ergonomics
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-6775ISBN: 978-91-980974-1-2 (print)OAI: oai:DiVA.org:hv-6775DiVA: diva2:753694
Conference
The 6th Swedish Production Symposium, 2014
Available from: 2014-10-08 Created: 2014-10-06 Last updated: 2016-02-10Bibliographically approved
In thesis
1. Laser welding of boron steels for light-weight vehicle applications
Open this publication in new window or tab >>Laser welding of boron steels for light-weight vehicle applications
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Laser beam welding has gained a significant interest during the last two decades. The suitability of the process for high volume production has the possibility to give a strong advantage compared to several other welding methods. However, it is important to have the process in full control since various quality issues may otherwise occur. During laser welding of boron steels quality issues such as imperfections, changes in local and global geometry as well as strength reduction can occur. The aspects that need to be considered are strongly depending on alloy content, process parameters etc. These problems that can occur could be fatal for the construction and the lowest level of occurrence is wanted, independent of industry.

The focus of this study has been to investigate the properties of laser welded boron steel. The study includes laser welding of boron alloyed steels with strengths of 1500 MPa and a recently introduced 1900 MPa grade. Focus has been to investigate weldability and the occurrence of cracks, porosity and strength reducing microstructure that can occur during laser welding, as well as distortion studies for tolerances in geometry. The results show that both conventional and 1900 MPa boron alloyed steel are suitable for laser welding.

Due to the martensitic structure of welds the material tends to behave brittle. Cracking and porosity do not seem to be an issue limiting the use of these steels. For tolerances in geometry for larger structures tests has been done simulating laser welding of A-pillars and B-pillars. Measurements have been done with Vernier caliper as well as a more advanced optical method capturing the movements during the welding sequence. Results from the tests done on Ushaped beams indicates that depending on the geometry of the structure and heat input distortions can be controlled to give distortions from 1 to 8 mm, at a welding length of 700 mm. This means that important geometry points can be distorted several millimeters if the laser welding process not is controlled.

Place, publisher, year, edition, pages
Trollhättan: University West, 2015. 100 p.
Series
Licentiate Thesis: University West, 1
Keyword
Laser welding; boron steel; high strength steels; strength reduction; brittle behavior; crack susceptibility; distortions; light-weight; quality
National Category
Production Engineering, Human Work Science and Ergonomics Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
urn:nbn:se:hv:diva-7263 (URN)978-91-87531-04-0 (ISBN)
Presentation
2015-01-22, C118, Högskolan Väst, Trollhättan, 10:15 (English)
Opponent
Supervisors
Available from: 2015-01-12 Created: 2015-01-09 Last updated: 2016-04-19Bibliographically approved

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