University of Oulu

Mikko Hietala, Antti Järvenpää, Markku Keskitalo, Matias Jaskari, Kari Mäntyjärvi, Tensile and fatigue properties of laser-welded ultra-high-strength stainless spring steel lap joints, Procedia Manufacturing, Volume 36, 2019, Pages 131-137, ISSN 2351-9789,

Tensile and fatigue properties of laser-welded ultra-high-strength stainless spring steel lap joints

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Author: Hietala, Mikko1; Järvenpää, Antti1; Keskitalo, Markku1;
Organizations: 1University of Oulu / Kerttu Saalasti Institute, Pajatie 5, Nivala FI-85500, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.8 MB)
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Language: English
Published: Elsevier, 2019
Publish Date: 2020-02-18


The study was performed to investigate the usability of thin 0.3 mm thick ultra-high-strength stainless spring steel in laser-welded simple panel structures. The mechanical properties of the laser welded joints in lap-shear specimens were investigated. The fatigue and shear strength of laser joints were experimentally investigated using continuous and intermittent lap joints that were welded using various energy inputs. The properties of separate laser welds were characterized by hardness testing and optical microscopy.

Results of the hardness measurements showed that there was softened area at heat-affected-zone of the welds. Due to the weld mismatch, significant strain hardening took place at the weld seams. The shear strength of tested continuous lap joints was slightly lower compared to the yield strength of the base material. Fatigue strength of the studied lap joints was at acceptable level for dynamically loaded simple panel structures and the fatigue strength of the weld seams was in practice dependent on the weld area instead of weld type.

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Series: Procedia manufacturing
ISSN: 2351-9789
ISSN-E: 2351-9789
ISSN-L: 2351-9789
Volume: 36
Pages: 131 - 137
DOI: 10.1016/j.promfg.2019.08.018
Host publication: 17th Nordic Laser Materials Processing Conference - NOLAMP17
Host publication editor: Akselsen, Odd M.
Bunaziv, Ivan
Conference: Nordic Laser Materials Processing Conference
Type of Publication: A4 Article in conference proceedings
Field of Science: 216 Materials engineering
214 Mechanical 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 and NIHAK Nivala-Haapajarvi region registered association. The industrial companies Wärtsilä Finland Oyj, SSAB Europe Oyj, HT Laser Oy, Randax Oy, Konestar Oy, Filtra Group Oy and Miilux Oy have participated in this research work.
Copyright information: © 2019 The Authors. Published by Elsevier B.V.