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Welding in the World

, Volume 48, Issue 5–6, pp 67–73 | Cite as

Fatigue Strength of a Longitudinal Attachment Improved by Ultrasonic Impact Treatment

  • V. M. Lihavainen
  • G. Marquis
  • E. S. Statnikov
Technical Papers

Abstract

Improvement methods can be divided into two main groups: weld geometry modification and residual stress modification. The former remove weld toe defects and/or reduce the stress concentration while the latter introduce compressive stress fields in the area where fatigue cracks are likely to initiate. Ultrasonic impact treatment belongs to residual stress improvement methods. It makes use of an ultrasonic carrier frequency to accelerate hardened tools that, in turn, impact the weld toe. The fatigue strength of non-load carrying attachments in the as-welded condition has been experimentally compared to the fatigue strength of ultrasonic impact treated welds. Longitudinal attachment specimens made of two thicknesses of steel S355 J0 have been tested for determining the efficiency of ultrasonic impact treatment. Treated welds were found to have about 50% greater fatigue strength, when the slope of the S-N-curve is three. High mean stress fatigue testing based on the Ohta-method did not decrease the degree of weld improvement due to UIT. This indicated that the method could be also applied for large fabricated structures operating under high reactive residual stresses equilibrated within the volume of the structure.

IIW-Thesaurus keywords

Fatigue strength Mechanical properties Fatigue loading Loading Ultrasonic processing Post weld operations Peening Work hardening Combined processes Fatigue cracks Cracking Defects Corrosion Compression Stress distribution Residual stresses Welded joints Weld toes Weld metal Weld shape Test pieces Thickness Nonload carrying GMA welding Arc welding Gas shielding arc welding Process parameters Statistical methods Accessories Carbon manganese steels Steels Practical investigations Classifying Reference lists 

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Copyright information

© International Institute of Welding 2004

Authors and Affiliations

  • V. M. Lihavainen
    • 1
  • G. Marquis
    • 1
  • E. S. Statnikov
    • 2
  1. 1.Lappeenranta University of TechnologyLappeenrantaFinland
  2. 2.Applied UltrasonicsUSA

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