Influence of cyclic loading on the relaxation behavior of compressive residual stress induced by UIT

  • Takyuki YonezawaEmail author
  • Hiroshi Shimanuki
  • Takeshi Mori
Research Paper


Fatigue strength of welded joints is improved by inducing compressive residual stress at weld toes. The ultrasonic impact treatment (UIT) is regarded as an effective method for inducing compressive residual stress at weld toes. However, excessive loads that cause plastic deformation at weld toes relieve the induced compressive residual stress. In addition, stress fluctuation affects the relaxation of residual stress even it is smaller than the yield strength. The relaxation of compressive residual stress decreases the fatigue strength improvement. Therefore, in order to evaluate the fatigue strength of welded joints enhanced by UIT, it is necessary to quantify the relaxation of local residual stresses at weld toes under cyclic loading. In this study, we measured a residual stress at the UIT groove using the X-ray diffraction method with a small-diameter collimator and an irradiation angle that was corrected based on the shape effect of the UIT groove, and we investigated its relaxation behavior under cyclic loading. In addition, we estimated the fatigue test results of the out-of-plane gusset joints improved by UIT using the modified Goodman diagram considering the relaxation of residual stress.


UIT HFMI Residual stress Fatigue strength Out-of-plane gusset welded joint 



  1. 1.
    Takahashi I, Yoshii T, Iidaka H, Fujii E, Matsuoka K (1991) Fatigue strength of non-load-carrying fillet welded joints using KE36 (TMCP) steel -effects of weld residual stresses and stress concentration factor. J Soc Nav Architects Jpn 169:267–277CrossRefGoogle Scholar
  2. 2.
    Matsuoka K, Takahashi I, Fujii E (1992) Effect of yield stress on fatigue strength of non-load-carrying fillet welded joints. J Soc Nav Architects Jpn 171:417–425CrossRefGoogle Scholar
  3. 3.
    Mori T, Shimanuki H, Tanaka M (2012) Effect of UIT on fatigue strength of web-gusset welded joints considering service condition of steel structures. Welding in the world 56:141–149CrossRefGoogle Scholar
  4. 4.
    Statnikov ES (1997) Comparison of efficiency and processibility of post-weld deformation methods for increase in fatigue strength of welded joints. IIW Document XIII-1668-97Google Scholar
  5. 5.
    Marquis GB, Barsoum Z (2013) Fatigue strength improvement of steel structures by high-frequency mechanical impact: proposed procedures and quality assurance guidelines. Welding in the World 57(6):803–822CrossRefGoogle Scholar
  6. 6.
    Statnikov ES, Vityazev V, Korolkov O (2005) Ultrasonic impact treatment ESONIX versus ultrasonic peening. IIW Document No. XIII-2050-05Google Scholar
  7. 7.
    Statnikov ES, Korostel V, Vekshin N, Marquis GB (2006) Development of Esonix ultrasonic impact treatment techniques. IIW Document No. XIII-2098-06Google Scholar
  8. 8.
    Yildirim HC, Marquis GB (2012) Fatigue strength improvement factors for high strength steel welded joints treated by high frequency mechanical impact. Int J Fatigue 44:168–176CrossRefGoogle Scholar
  9. 9.
    Shimanuki H, Mori T, Tanaka M (2013) Study of a method for estimating the fatigue strength of welded joints improved by UIT. IIW Document No. XIII-2495-13Google Scholar
  10. 10.
    Shimanuki H, Tanaka M, Mori T (2015) Estimation method of fatigue strength based on the residual stress for the welded joint improved by ultrasonic impact treatment (UIT). IIW Document No. XIII-2603-15Google Scholar
  11. 11.
    Suzuki T, Okawa T, Shimanuki H, Nose R, Ohta N, Suzuki H, Moriai A (2014) Effect of ultrasonic impact treatment (UIT) on fatigue strength of welded joints. Adv Mater Res 996:736–742CrossRefGoogle Scholar
  12. 12.
    APLIED ULTRASONICS HP; Accessed 12 September 2019
  13. 13.
    Pulstec Industrial Co., Ltd. HP; Accessed 12 September 2019
  14. 14.
    Taira S, Tanaka K, Yamasaki T (1978) A method of X-ray microbeam measurement of local stress and its application to fatigue crack growth problems. J Soc Mater Sci 27(297):251–256CrossRefGoogle Scholar
  15. 15.
    Sasaki T, Hirose Y, Single (1995) Incidence X-ray stress measurement for all plane stress components using imaging plate of two-dimensional X-ray detector. J Soc Mater Sci 44 (504): 1138–1143Google Scholar
  16. 16.
    SR202 committee (1991) Research on fatigue design and quality of welded parts in offshore structures. Shipbuilding Research Association of JapanGoogle Scholar
  17. 17.
    Mori T, Shimanuki H, Tanaka M (2010) Japan Society of Civil Engineers 2010 annual meeting, 65:I-099Google Scholar
  18. 18.
    Shimanuki H, Mori T, Tanaka M (2011) Japan Society of Civil Engineers 2011 annual meeting, 66:I-144Google Scholar
  19. 19.
    Shimanuki H, Mori T, Tanaka M (2012) Japan Society of Civil Engineers 2012 annual meeting, 67:I-260Google Scholar

Copyright information

© International Institute of Welding 2019

Authors and Affiliations

  1. 1.Nippon SteelChibaJapan
  2. 2.Hosei UniversityTokyoJapan

Personalised recommendations