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Fatigue strength improvement of steel structures by high-frequency mechanical impact: proposed procedures and quality assurance guidelines

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Abstract

High-frequency mechanical impact (HFMI) has emerged as a reliable, effective, and user-friendly method for post-weld fatigue strength improvement technique for welded structures. During the past decade, 46 documents on HFMI technology for fatigue improvements have been presented within Commission XIII of the International Institute of Welding (IIW). This paper presents an overview of the lessons learned concerning appropriate HFMI procedures and quality assurance measures. Due to differences in HFMI tools and the wide variety of potential applications, certain details of proper treatment procedures and quantitative quality control measures are presented generally. Specific details should be documented in an HFMI procedure specification for each structure being treated. It is hoped that this guideline will provide a stimulus to researchers working in the field to test and constructively criticize the proposals made with the goal of developing international guidelines relevant to a variety of HFMI technologies and applicable to many industrial sectors. A companion document presents a fatigue design proposal for HFMI treatment of welded steel structures. The proposal is considered to apply to steel structures of plate thicknesses of 5 to 50 mm and for yield strengths ranging from 235 to 960 MPa. Stress assessment may be based on nominal stress, structural hot spot stress, or effective notch stress.

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Acknowledgments

Support for this work has been partially provided by the LIGHT research program of the Finnish Metals and Engineering Competence Cluster, the Finnish Funding Agency for Technology and Innovation, and the European Union’s Research Fund for Coal and Steel Research Programme under grant agreement no RFSR-CT-2010-00032: “Improving the fatigue life of high strength steel welded structures by post weld treatments and specific filler material.” Cooperation with HFMI companies Pfeifer Seil- und Hebetechnik GmbH, Germany; Structural Integrity Technologies Inc., Canada; LETS Global AB, Sweden, Applied Ultrasonics, the Netherlands; and PITEC GmbH, Germany are acknowledged.

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Authors and Affiliations

  1. Department of Applied Mechanics, Aalto University, Espoo, Finland

    Gary Marquis

  2. Division of Lightweight Structures, KTH-Royal Institute of Technology, Stockholm, Sweden

    Gary Marquis & Zuheir Barsoum

Authors
  1. Gary Marquis
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  2. Zuheir Barsoum
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Correspondence to Gary Marquis.

Additional information

Doc. IIW-2395, recommended for publication by Commission XIII “Fatigue of Welded Components and Structures.”

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Marquis, G., Barsoum, Z. Fatigue strength improvement of steel structures by high-frequency mechanical impact: proposed procedures and quality assurance guidelines. Weld World 58, 19–28 (2014). https://doi.org/10.1007/s40194-013-0077-8

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  • DOI: https://doi.org/10.1007/s40194-013-0077-8

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