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Reducing Distortion and Residual Stress Using Dynamically Controlled Low Stress No Distortion and Its Influence on Fatigue Crack Growth Properties of Steel Welded Joints

  • Heri Wibowo
  • M. Noer Ilman
  • Priyo Tri Iswanto
  • M. Rifai Muslih
Technical Paper
  • 7 Downloads

Abstract

The need for reducing weld distortion and residual stress in welded thin plate structures has led to the development of stress-relieving methods. In-process welding technique using dynamically controlled low stress no distortion (DC-LSND) has been increasingly utilized for reducing distortion. The present investigation aims to study the effect of DC-LSND on distortion, residual stress, strength and fatigue crack growth behavior in steel weld joints. The DC-LSND treatments were carried out by quenching the weld metal region behind the welding torch using cryogenic liquid nitrogen. The sequence of tests was performed including distortion measurement, microstructure examination, hardness test, tensile test, residual stress measurement and fatigue crack growth test combined with SEM examination. Results showed that DC-LSND treatments reduced out-of-plane distortions accompanied by increasing strength and a hardness value of the weld joints and these improved mechanical properties are associated with weld microstructures. The modified DC-LSND treatment is most effective in reducing out-of-plane distortion. Another important finding in this research is that DC-LSND treatments improve fatigue crack growth performance of the weld joints which could be related to weld residual stress.

Keywords

DC-LSND Distortion Residual stress Fatigue Welding 

Notes

Acknowledgements

This work was financially supported by Doctoral Grant on Ministry of Research, Technology and High Education of Indonesia.

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Copyright information

© The Indian Institute of Metals - IIM 2018

Authors and Affiliations

  1. 1.Department of Mechanical and Industrial EngineeringUniversitas Gadjah MadaYogyakartaIndonesia
  2. 2.Department of Mechanical Engineering EducationYogyakarta State UniversityYogyakartaIndonesia
  3. 3.National Nuclear Energy Agency of Indonesia (BATAN)SerpongIndonesia

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