IIW Recommendations on High Frequency Mechanical Impact (HFMI) Treatment for Improving the Fatigue Strength of Welded Joints
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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.
KeywordsPeening Weld toe Fatigue improvement High-strength steels Fatigue strength Stress analysis
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