PSI - Issue 2_A

Ebrahim Harati et al. / Procedia Structural Integrity 2 (2016) 3483–3490 Harati et al. / Structural Integrity Procedia 00 (2016) 000–000

3490

8

the weld metal was observed when increasing the number of runs. HFMI treatment increased the fatigue strength by 26%. The treatment did not increase the weld toe radius significantly but resulted in a more uniform weld toe geometry along the weld. A depth of treatment in the base metal in the range of 0.15-0.19 mm and a width of treatment in the range of 2.5-3 mm, were achieved. It seems that the three run treatment would be a more economical option than the six run treatment providing a similar or even more favourable geometry modification. Acknowledgements The financial support of the Swedish Energy Agency is gratefully acknowledged. The authors would like to thank ESAB AB, Volvo Trucks and SONATS for their contributions to this paper. References Aashto L, 1998. Bridge design specifications. American Association of State Highway and Transportation Officials, Washington, DC Ghahremani K, Safa M, Yeung J, et al, 2014. Quality assurance for high-frequency mechanical impact (HFMI) treatment of welds using handheld 3D laser scanning technology. Weld World 59, 391–400. Harati E, Karlsson L, Svensson L-E, Dalaei K, 2015. The relative effects of residual stresses and weld toe geometry on fatigue life of weldments. Int J Fatigue 77, 160–165. Harati E, Svensson L-E, Karlsson L, Widmark M, 2016. Effect of High Frequency Mechanical Impact treatment on fatigue strength of 1300 MPa yield strength steel welds. Submitted to the International Journal of Fatigue. Leitner M, Gerstbrein S, Ottersböck MJ, Stoschka M, 2015. Fatigue Strength of HFMI-treated High-strength Steel Joints under Constant and Variable Amplitude Block Loading. Procedia Eng 101,251–258. Malaki M, Ding H, 2015. A review of ultrasonic peening treatment. Mater Des 87, 1072–1086. Marquis G, Barsoum Z, 2013. Fatigue strength improvement of steel structures by high-frequency mechanical impact: proposed procedures and quality assurance guidelines. Weld World 58, 19–28. Mikkola E, Marquis G, Lehto P, et al, 2016. Material characterization of high-frequency mechanical impact (HFMI)-treated high-strength steel. Mater Des 89, 205–214. Statnikov AS, 2000. Applications of operational ultrasonic impact treatment (UIT) technologies in production of welded joints. Weld WORLD Lond- 44, 11–21. Weich D-II, 2013. Henry Granjon Prize Competition 2009 Winner Category C: Design and Structural Integrity; EDGE Layer Condition and Fatigue Strength of welds improved by mechanical post-weld treatment. Weld World 55, 3–12. Zhang H, Wang D, Xia L, et al, 2015. Effects of ultrasonic impact treatment on pre-fatigue loaded high-strength steel welded joints. Int J Fatigue 80:278–287. Zhao X, Wang D, Huo L, 2011. Analysis of the S–N curves of welded joints enhanced by ultrasonic peening treatment. Mater Des 32, 88–96.