Machines. Technologies. Materials.
Vol. 19 (2025), Issue 1, pg(s) 25-29

TECHNOLOGIES

Large-scale distortion analysis of the welding and thermal straightening process chain

  • 1 IMSETHAC, Bulgarian Academy of Science, Sofia, Bulgaria

Abstract

An coupled analytic-numerical model for calculation of distortions arising by welding fabrication is introduced. Target of the analytical model is the calculation of the inherent strains after the local thermal-mechanical influence of the welding or thermal straightening process. Following the fabrication processing chart the strains are loaded on an elastic FE-model of the structure and the residual stresses and distortions of the whole structure are calculated. The consideration of welding and thermal straightening scenarios, inclusively the assembling stages, is done by taking into consideration the intermediate variation of the strain state in the FE-model of the structure at every processing step. The important physical relations are demonstrated. The model is intended to be used for solving industrial tasks, i.e. intending acceptable precision and calculation time as well as low simulation costs.

Keywords

References

  1. Michailov, V; Doynov, N; Kuke, F: Applied Simulation of thermal Straightening, Book Series FOSTA P 1008, Verlag und Vertriebsgesellschaft mbH, Düsseldorf (2017)
  2. Okerblom N. O.: Welding Stresses in Metal Structures, Mashinostroenie, Moskau/Leningrad (1955) (in Russian)
  3. Nikolaev G. A.: Welding Structures, Maschgiz Moskau (1962) (in Russian)
  4. Gatovskii K. M., Karkhin V. A.: Theory of Welding Deformations and Stresses, LKI, Leningrad (1980) (in Russian)
  5. Vinokurov V. A.: Welding Stresses and Distortion, Mashinostroenie, Moskau (1968) (Transl. in Englisch, British Library, Wetherby, 1977)
  6. Kuzminov S. A.: Welding Deformations of Ship-Structures, Sudostroenie, Leningrad (1974) (in Russian)
  7. Ueda Y., Fukuda K., Kim, Y. C.: Restraint Stresses and Strains due to Silt Weld in Rectangular Plates, Trans. LWRI (1978) 7(1): 11-16
  8. Neumann A., Röbenack K.-D.: Verformungen und Spannungen beim Schweißen, VEB Verlag Technik, Berlin (1978) (in German)
  9. Makhnenko V. I.: Calculation Methods for investigation of the Kinetics of Welding stresses and Distortions, (1976) (in Russian)
  10. Ueda Y., Yamakawa T.: Analysis of thermal elastic-plastic stress and strain during welding by finite element method, Trans JWS (1971):2(2), 90-100
  11. Lindgren, L.-E.: Computational Welding Mechanics, Woodhead Publishing (2007)
  12. Radaj D.: Welding residual stresses and distortion. Calculation and measurement, DVS-Verlag, Duesseldorf (2003)
  13. Goldack,J.A., Alkhady, M.: Computational Welding Mechanics, Springer (2005)
  14. Duan Y. G., Vincent Y., et al.: Prediction of welding residual distortions of large structures using a local/global approach,
  15. Journal of Mechanical Science and Technologie, (2007) 21(10): 1700-1706
  16. Tsirkas S. A., Papanikos P., et al.: Evaluation of distortions in laser welded shipbuilding parts using local-global finite element approach, Science and Technology of Welding and Joining (2003) 8(2): 79-88
  17. Michailov, V., Doynov, N., Stapelfeld, C,. Ossenbrink, R.: Hybrid model for prediction of welding distortions in large structures, Front. Mater. Sci. (2011) 5(2): 209–215
  18. Michailov, V., Stapelfeld, C., Doynov, N.: Upgrade of an analytic-numerical hybrid model for the distortion simulation of large structures, FOSTA VV mbH Düsseldorf (2014) (in German)
  19. Doynov, N; Stapelfeld, C; Michailov, VG; Pasternak, H; Launert, B: Distortion analysis of large scaled welded structures, In: Mathematical Modeling of Weld Phenomena 12, Eds.: C. Sommitsch, N. Einzinger, P. Mayr, Verl. TU-Graz (2019): 254-280
  20. Michailov, V.G., Karkhin, V.A., Petrov, P.P.: Fundamentals of Welding, Polytechnic Univercity Publ. St. Petersburg (2016)
  21. Michailov, V., Stapelfeld, C., Doynov, N.: Calculation of welding distortions in large and complex structures using a new coupled analytic-numerical model, Proc. Advanced Metal Materials and Technologies (AMMT’13), 25. – 29. Juni 2013, St. Petersburg (2013): 516 – 522
  22. Doynov, N., Michailov, V.G.: Distortion analysis of heat spot straightening thin-walled welded structures: part 1: formation of the plastic deformation zone, Int J Adv Manuf Technol. (2018) 94: 667–676,
  23. Doynov, N., Michailov, V.G.: Distortion analysis of heat spot straightening thin-walled welded structures: part 2: analytical-numerical approach, Int J Adv Manuf Technol (2018) 95: 469– 478
  24. Karkhin, V.A.: Thermal processes in welding, Springer (2019)
  25. Doynov, N. Hybrid models for calculation of distortion and residual stresses in large and complex welded structures, DSc Thesis, Brandenburg University of Technology, Cottbus- Senftenberg (2023), doi:10.26127/BTUOpen-6453 (in German)

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