Steel and Composite Structures

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Effect of welding defects on mechanical properties of welded joints subjected to temperature

  • Yan, Min (School of Mechanics & Civil Engineering, China University of Mining and Technology) ;
  • Guo, Zhen (School of Mechanics & Civil Engineering, China University of Mining and Technology) ;
  • Li, Chenfeng (College of Shipbuilding Engineering, Harbin Engineering University) ;
  • Liu, Yi (School of Mechanics & Civil Engineering, China University of Mining and Technology) ;
  • Wang, Xiangren (School of Mechanics & Civil Engineering, China University of Mining and Technology)
  • Received : 2020.03.25
  • Accepted : 2021.06.28
  • Published : 2021.07.25
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Abstract

Welding defects negatively affect the safety of steel structures. In fire, the steel connections with welding defects would fracture prematurely that cause the structure lose their fire resistance. However, the knowledge of effects of welding defects on welding connections at elevated temperature are still limit. This paper conducted steady-state tensile tests on butt welded specimens with artificial defects to investigate the effect of defects on the mechanical properties of butt welding at high temperatures. These effects on the evolution law of stress and strain, fracture strengths and extension abilities were discussed. The results show that the stress concentration caused by the defects in the welding zone reduced the yield strengths of the weldments at high-temperature, and the stress concentration induced brittle fracture occurring at the welding zone at high temperature with low levels and produced different failure modes. The extension abilities of the weldments at different temperatures were influenced by the defect levels significantly.

Keywords

Acknowledgement

The research, in this paper, supported by "the Key Project of Research and Development Program of Xuzhou, China". The authors would like to thank for its support of this area of research as one of the plan items of application and innovation, which is numbered as KC18220.

References

  1. AISC 360-05 (2010), Specification for Structural Steel Buildings, American Institute of Steel Construction, Chicago, USA.
  2. AS 4100 (1998), Steel structures, Standard Australian, Sydney, Australia.
  3. ASCE (1992), Structural fire protection, The American Society of Civil Engineers, New York, USA.
  4. ASTM E21-17 (2017), Standard test methods for elevated temperature tension tests of metallic materials, ASTM International, West Conshohocken, PA.
  5. BS 5950 (2003), Structural use of steelwork in building-Part 8: standard of practice of fire resistant design, British Standards Institution, British.
  6. BS EN ISO 17638 (2016), Non-Destructive Testing of WeldsMagnetic Particle Testing, European Committee for Standardization, Brussels.
  7. BS EN ISO 23278 (2015), Non-Destructive Testing of Welds - Magnetic Particle Testing of Welds-Acceptance Levels, European Committee for Standardization, Brussels.
  8. Budden, P.J., Sharples. J.K. and Dowling, A.R. (2000), "The R6 procedure: recent developments and comparison with alternative approaches", Int. J. Press. Vess. Pip., 77(14), 895-903. https://doi.org/10.1016/S0308-0161(01)00012-6.
  9. CECS (2006), Technical Code for Fire Safety of Steel Structure in Buildings: CECS 200-2006, Chinese Plan Press, Beijing, China.
  10. CEN (2005), Eurocode 3: Design of Steel structures, Part 1-2: General Rules-Structural Fire Design, European Committee for Standardization, Brussels.
  11. Chang, H. and Yeh, C. (2019), "A study on behavior of steel joints that combine high-strength bolts and fillet welds", Steel Compos. Struct., 31(4), 361-372. https://doi.org/10.12989/scs.2019.31.4.361.
  12. Fu, Z., Ji, B., Wang, Y. and Xu, J. (2018), "Fatigue performance of rib-roof weld in steel bridge decks with corner braces", Steel Compos. Struct., 26(1), 103-113. https://doi.org/10.12989/scs.2018.26.1.103.
  13. Guo, W., Shen, H. and Li, H. (2003), "Stress intensity factors for elliptical surface cracks in round bars with different stress concentration coefficient", Int. J. Fatigue, 25(8), 733-741. https://doi.org/10.1016/S0142-1123(03)00050-1.
  14. Guo, Z., Jia, X. and Qiao, W. (2019), "Mechanical properties of butt weldments made with Q345B steel and E5015 electrodes at different temperatures", J. Mater. Civil Eng., 31(9), 04019185 https://doi.org/10.1061/(ASCE)MT.1943-5533.0002845.
  15. Hou, X., Zheng, W., Kodur, V. and Sun, H. (2014), "Effect of temperature on mechanical properties of prestressing bars", Constr. Build. Mater., 61, 24-32. https://doi.org/10.1016/j.conbuildmat.2014.03.001.
  16. Jonsson, B., Dobmann, G., Hobbacher, A.F., Kassner, M. and Marquis, G. (2016), "Fitness for service.IIW guidelines on weld quality in relationship to fatigue strength. IIW collection", Springer, Cham. https://doi.org/10.1007/978-3-319-19198-0_8.
  17. Lu, J., Liu, H., Chen, Z. and Liao, X. (2016), "Experimental investigation into the post-fire mechanical properties of hotrolled and cold-formed steels", J. Constr. Steel Res., 121, 291-310. https://doi.org/10.1016/j.jcsr.2016.03.005.
  18. Maraveas, C., Fasoulakis, Z.C. and Tsavdaridis, K.D. (2017), "Mechanical properties of high and very high steel at elevated temperatures and after cooling down", Fire Sci. Rev., 6(1), 3. https://doi.org/10.1186/s40038-017-0017-6.
  19. Qi, D.M. (1992), "Recommendations on the treatment of residual stresses in PD6493 for the assessment of the significance of weld defects", Eng. Fract. Mech., 41(2), 257-270. https://doi.org/10.1016/0013-7944(92)90187-J.
  20. Shi, G., Ban, H.W., Shi, Y.J. and Wang, Y.Q. (2013), "Overview of research progress for high strength steel structures", Eng. Mech., 30(1), 1-13. https://doi.org/10.6052/j.issn.1000-4750.2012.05.ST10.
  21. Tingey, C., Galloway, A., Toumpis, A. and Cater, S. (2015), "Effect of tool centreline deviation on the mechanical properties of friction stir welded dh36 steel", Mater. Design, 65, 896-906. https://doi.org/10.1016/j.matdes.2014.10.017.
  22. Wei, K.F. and Han, D. (2016), "Analysis of damages to steel structure welded joints and measures to improve seismic performance", Ind. Constr., 46(9), 163-168. https://doi.org/10.13204/j.gyjz201609033.
  23. Zhang, G., Zhu, M.C., Kodur, V.K. and Li, G. (2017), "Behavior of welded connections after exposure to elevated temperature", J. Constr. Steel Res., 130, 88-95. https://doi.org/10.1016/j.jcsr.2016.12.004.