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Über dieses Buch

This book of recommendations presents an overview of High Frequency Mechanical Impact (HFMI) techniques existing today in the market and their proper procedures, quality assurance measures and documentation. Due to differences in HFMI tools and the wide variety of potential applications, certain details of proper treatments and quantitative quality control measures are presented generally. An example of procedure specification as a quality assurance measure is given in the Appendix.

Moreover, the book presents procedures for the fatigue life assessment of HFMI-improved welded joints based on nominal stress, structural hot spot stress and effective notch stress. It also considers the extra benefit that has been experimentally observed for HFMI-treated high-strength steels.

The recommendations offer proposals on the effect of loading conditions like high mean stress fatigue cycles, variable amplitude loading and large amplitude/low cycle fatigue cycles. Special considerations for low stress concentration welded joints are also given. In order to demonstrate the use of the guideline, the book provides several fatigue assessment examples.



IIW Recommendations on High Frequency Mechanical Impact (HFMI) Treatment for Improving the Fatigue Strength of Welded Joints

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. This guideline presents recommendations on proper treatment procedures, quality control measures and fatigue strength improvement assessment based on nominal, hot spot and effective notch stress methods. Recommendations on effect of loading conditions, variable amplitude loading, low cycle fatigue and consideration of low stress concentration details are also given. The guideline is applicable to steel structures of plate thicknesses of 5–50 mm and for yield strength ranging from 235 to 960 MPa.
Gary B. Marquis, Zuheir Barsoum
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