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Comparing the adhesion strength of 316L stainless steel joints after laser surface texturing by CO2 and fiber lasers

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Abstract

This paper focuses on the effects of the laser surface texturing process and joint configuration of stainless steel adherends on the adhesive tensile bond strength. Two different sources, a CO2 and a fiber laser, were used and compared. In particular, proper choice of laser parameters was explored with the aim of producing different roughness and peak-to-valley distance and different textures on the bonding area, which could increase the real contact surface. Furthermore, to more thoroughly understand the effect of the laser parameters on joint fracture load, the experimental campaign was conducted according to a Design of Experiment (DoE) framework and the results were analyzed with this methodology. The creation of particular textures and roughness levels were related to the resulting joint geometrical configuration and bond strengths. In particular, significant increases in joint bond strength were achieved using both laser sources. Furthermore, by optimizing the laser parameters, smaller laser spot scan path overlaps can be achieved as well as a more refined scale of surface texture and surface roughness. This thereby enables the joining of thinner sections of different materials.

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Abbreviations

RT:

Room temperature

DoE:

Design of experiment

JBS:

Joint bond strength

Ra :

Arithmetic mean height of the surface profile

RSM:

Response surface methodology

SLJ:

Single lap joint

TSS:

Tensile shear strength

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Acknowledgements

The authors gratefully acknowledge Chiara De Giorgi and IPG Photonics Italy S.r.l for the support provided in fiber laser surface treatment. The authors wish also to thank 3M Italy for the constant support in carrying out research activities on adhesive bonding technology.

Funding

This work was part funded from research supported by a research grant from Science Foundation Ireland (SFI) under grant number 16/RC/3872 and is co-funded under the European Regional Development Fund.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Genoa, Via All’ Opera Pia 15, 16145, Genoa, Italy

    Chiara Mandolfino & Enrico Lertora

  2. I-Form, and Advanced Processing Technology Research Centre, School of Mechanical & Manufacturing Engineering, Dublin City University, Dublin 9, Ireland

    Muhannad Obeidi & Dermot Brabazon

Authors
  1. Chiara Mandolfino
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  2. Muhannad Obeidi
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  3. Enrico Lertora
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  4. Dermot Brabazon
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Correspondence to Chiara Mandolfino.

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Mandolfino, C., Obeidi, M., Lertora, E. et al. Comparing the adhesion strength of 316L stainless steel joints after laser surface texturing by CO2 and fiber lasers. Int J Adv Manuf Technol 109, 1059–1069 (2020). https://doi.org/10.1007/s00170-020-05639-6

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  • DOI: https://doi.org/10.1007/s00170-020-05639-6

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