University of Oulu

M Hietala et al 2022 IOP Conf. Ser.: Mater. Sci. Eng. 1234 012032,

Mechanical properties of laser-welded and adhesive-bonded ultra-high-strength steel lap joints

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Author: Hietala, M.1; Keskitalo, M.1; Järvenpää, A.1
Organizations: 1University of Oulu, Kerttu Saalasti Institute, FI-85500 Pajatie 5 Nivala, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.7 MB)
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Language: English
Published: IOP Publishing, 2022
Publish Date: 2023-01-09


The need to manufacture lightweight structures from ultra-high-strength steels is forcing industry to look for new joining technologies. Hybrid joints are one of the new ways to join materials. This paper investigates joining ultra-high strength steel plates using laser welding and adhesive bonding. Steel used in this paper was abrasion resistant steel (AR600) with tensile strength (Rm) ≥ 2 GPa. Three different epoxy adhesives were used in the experiments. The weld morphologies were investigated using optical microscopy. The mechanical properties of the lap joints were evaluated by hardness measurements and tensile shear tests. Examining the profiles of the joints, it became clear that the adhesive causes an air gap between the plates, which affects the morphology of the joint. The air gap caused by the adhesive increased the width of the weld at the interface of the plates. The width of the weld at the interface was approximately 25% larger in the adhesive-bonded joint. Based on shear strength tests, the use of adhesive in addition to the laser weld significantly improved the shear strength of the lap joint. The shear strength of the best laser-welded and adhesive-bonded joint was approximately 84% higher than that of laser-welded joint.

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Series: IOP conference series. Materials science and engineering
ISSN: 1757-8981
ISSN-E: 1757-899X
ISSN-L: 1757-8981
Volume: 1234
Issue: 1
Article number: 012032
DOI: 10.1088/1757-899x/1234/1/012032
Host publication: IOP Conference Series: Materials Science and Engineering
Conference: International Conference on Materials Research and Innovation
Type of Publication: A4 Article in conference proceedings
Field of Science: 214 Mechanical engineering
216 Materials engineering
Funding: The authors would like to acknowledge the financial support received from the European Union (European regional development fund), City of Nivala, Nivala industrial park Ltd, NIHAK Nivala-Haapajarvi region registered association. The industrial companies Wärtsilä Finland Oyj, SSAB Europe Oyj, HT Laser Oy, Randax Oy and Miilux Oy have participated in this research work.
Copyright information: © The Author(s) 2022. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd.