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Quality assurance for high-frequency mechanical impact (HFMI) treatment of welds using handheld 3D laser scanning technology

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Abstract

The idea of using 3D point clouds obtained with the aid of a handheld 3D laser scanner for the quality assurance of high-frequency mechanical impact (HFMI) treatment is proposed and demonstrated in this paper. The effectiveness of impact treatments for extending the fatigue lives of welded structures has been demonstrated in numerous studies. Guidelines for the proper execution of impact treatments have been developed. A lack of suitable quality assurance (QA) procedures for accepting or rejecting the treatment after completion has been previously identified. In contrast with the existing QA procedures, which are based mainly on controlling inputs and visual inspection, a technology-based, quantitative methodology is developed in this paper. Five welded specimens were subjected to impact treatment at various levels to simulate under-, proper, and over-treatment. A handheld 3D laser scanner was then used to facilitate a point cloud-based method to determine the geometric parameters of the treated weld toe groove, which were then measured manually. The results show that the proposed methodology is successful in identifying the different treatment levels. This approach has a number of advantages over the existing QA methods, including the following: providing quantitative measures, ease of use, and archive-ability.

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Acknowledgments

Applied Ultrasonics is gratefully acknowledged for providing treatment of the weld specimens investigated in this paper. Rana Tehrani Yekta is gratefully acknowledged for performing the fatigue study that preceded the research presented in this paper. Dave Pow of Pow Engineering is also thanked for his technical input related to this research.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada

    Kasra Ghahremani, Mahdi Safa, Jamie Yeung, Scott Walbridge & Carl Haas

  2. Creaform Inc., Lévis, Québec, Canada

    Sebastien Dubois

Authors
  1. Kasra Ghahremani
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  2. Mahdi Safa
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  3. Jamie Yeung
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  4. Scott Walbridge
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  5. Carl Haas
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  6. Sebastien Dubois
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Corresponding author

Correspondence to Kasra Ghahremani.

Additional information

Doc. IIW-2522, recommended for publication by Commission XIII “Fatigue of Welded Components and Structures”

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Ghahremani, K., Safa, M., Yeung, J. et al. Quality assurance for high-frequency mechanical impact (HFMI) treatment of welds using handheld 3D laser scanning technology. Weld World 59, 391–400 (2015). https://doi.org/10.1007/s40194-014-0210-3

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  • DOI: https://doi.org/10.1007/s40194-014-0210-3

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