تأثیر هندسه الکترود برعمق فرورفتگی نقطه جوش مقاومتی در اتصال ورق فولادی و منیزیمی بدنه خودرو

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه علم و صنعت، تهران، ایران

چکیده

امروزه تمایل زیادی در اتصال ورق های غیرهمجنس جهت سبک‌سازی در صنایع مختلف، به‌خصوص صنعت خودرو مشاهده می‌شود. نقطه جوش مقاومتی در اتصال قطعات بدنه خودرو، کاربرد فراوانی داشته و از نظر استحکام و ابعادی دارای اهمیت می‌باشد. در این مقاله تأثیر هندسه الکترود با قطر 20 و 50 میلی‌متر بر عمق فرورفتگی نقطه جوش مقاومتی در اتصال ورق فولادی و آلیاژ منیزیم AZ31 مورد تحقیق قرار گرفته است. به‌منظور ارزیابی استحکام نقطه جوش از آزمون کششی- برشی استفاده گردید. نتایج نشان از استحکام 5000 نیوتن اتصال و کاهش 50 درصد عمق فرورفتگی به‌وسیله الکترود با قطر هندسه 50 میلی‌متر با میانگین عمق فرورفتگی 0/6 میلی‌متر در سمت منیزیم می‌باشد. ساختار نقطه جوش در این اتصال، دارای سه ناحیه لحیم سخت، محلول جامد و لحیم نرم بوده و دانه‌های دندریتی هم‌محور در مرکز و دانه‌های دندریتی هم‌محور و ستونی در پیرامون هسته نقطه جوش مشاهده گردید.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The influence of electrode geometry on depth indentation of the resistance spot welding in the joining of steel and magnesium sheets in the car body

نویسندگان [English]

  • A. Dehghani
  • M. Sedighi
School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده [English]

Nowadays, there is a desire in various industries, especially in the automotive industry, to join dissimilar sheet metals in order to reduce weight. Resistance spot welding is often applied to join body parts and its strength and dimensions of the weld are important. In this research, the influence of the electrode geometry with a diameter of 20 and 50 mm on the indentation depth of the resistance welding spot in the joining of sheet steel and the magnesium alloy AZ31 was investigated. A tensile shear test was carried out to evaluate the strength of the weld. The results showed that the strength of the joint was 5000 N and the 50% reduction in indentation depth by the electrode with a geometry diameter of 50 mm with an average indentation depth of 0.6 mm on the magnesium side. The structure of the weld in this joint had three Braze, solid solution, and solder regions. Moreover, dendritic coaxial grains in the center and coaxial and columnar grains at the periphery of the spot weld were observed.

کلیدواژه‌ها [English]

  • Dissimilar resistance spot welding
  • Depth of indentation spot welding
  • Electrode geometry
  • Joint structure

مراجع

  1. Manladan S, Yusof F, Ramesh S, Fadzil M. A review on resistance spot welding of magnesium alloys. Int J Adv Manu Tech. 2016; 86: 1805-25. https://doi.org/ 10.1007/s00170-015-8258-9
  2. Song G, Li T, Yu J, Liu L. A review of bonding immiscible Mg/steel dissimilar metals. Mater. 2018; 11(12): 2515. https://doi.org/10.3390/ma11122515
  3. Liu L, Xiao L, Feng J, Tian Y, Zhou S, Zhou Y. The mechanisms of resistance spot welding of magnesium to steel. Metall Mate Trans A. 2010; 41: 2651-61. https://doi.org/10.1007/s11661-010-0333-0
  4. Penner P. Resistance spot welding of Al to Mg with different interlayers: University of Waterloo; 2013. http://hdl.handle.net/10012/7723
  5. Feng Y, Li Y, Luo Z, Ling Z, Wang Z. Resistance spot welding of Mg to electro-galvanized steel with hot-dip Galvanized steel interlayer. J Mat Proc Tech. 2016; 236: 114-22. https://doi.org/10.1016/j.jmatprotec.05.015
  6. Miyamoto K, Nakagawa S, Sakamoto H, Iwatani S, Hojo S, Tachibana T, et al. Dissimilar Joining of Magnesium Alloy and Steel by Resistance Spot Welding. Trans Soc Automot Eng Jpn. 2012; 43(6). https://doi.org/10.18910/23065
  7. Manladan S, Yusof F, Ramesh S, Zhang Y, Luo Z, Ling Z. Microstructure and mechanical properties of resistance spot welded in welding-brazing mode and resistance element welded magnesium alloy/austenitic stainless steel joints. J Mat Proc Tech. 2017; 250: 45-54. http://dx.doi.org/10.1016/j.jmatprotec.2017.07.006
  8. Xu W, Chen D, Liu L, Mori H, Zhou Y. Microstructure and mechanical properties of weld-bonded and resistance spot welded magnesium-to-steel dissimilar joints. J Mat Sci Eng A. 2012; 537: 11-24. https://doi.org/10.1016/j.msea. 2011.12.096
  9. Kasukawa M, Nakagawa S, Miyamoto K. Dissimilar metal joining method for magnesium alloy and steel. Google Patents; 2015.
  10. Karim MA, Park Y-D. A review on welding of dissimilar metals in car body manufacturing. J Weld Join. 2020; 38(1): 8-23. https://doi.org/10.5781/JWJ. 2020.38.1.1
  11. Liu L, Xiao L, Chen D, Feng J, Kim S, Zhou Y. Microstructure and fatigue properties of Mg-to-steel dissimilar resistance spot welds. Mater Des. 2013; 45: 336-42. https://doi.org/1016/j.matdes.2012.08.018
  12. Jiang X, Yu H, Lin Q, Xu R, editors. Effects of Cu-Zn alloy additions on microstructure and strength of welded joints between magnesium alloy and mild steel. Proceedings of the 2015 International Conference on Mechatronics, Electronic, Industrial and Control Engineering (MEIC-15); 2015. Atlantis Press. . https://doi.org/10.2991/meic-15.2015.140
  13. Wang T, Upadhyay P, Whalen S. A review of technologies for welding magnesium alloys to steels. Int J Precis Eng Manuf-Green Technol. 2021; 8: 1027-42. https://doi.org/10.1007/s40684-020-00247-x
  14. Liu L, Feng J, Zhou Y. Resistance spot welding of magnesium alloys. Welding and Joining of Magnesium Alloys: Elsevier; 2010. p. 351-67e. https://doi.org/10. 1533/9780857090423.2.351
  15. Jafarian M, Paidar M. The comparison of microstructure and mechanical properties of diffusion joints of 5754, 6061, and 7039 aluminum alloys to AZ31 magnesium alloy. J Adv Mater Eng (Esteghlal). 2022; 35(1): 11-21. https://doi.org/ 18869/acadpub.jame.35.1.11
  16. Qiu R, Li J, Shi H, Yu H. Characterization of resistance spot welded joints between aluminum alloy and mild steel with composite electrodes. J Mater Res Technol. 2023; 24: 1190-1202. https://doi. org/10.1016/j.jmrt.2023.03.069
  17. Walker L, Fink C, Hilla C, Lu Y, Zhang, W. Peculiar roles of nickel diffusion in intermetallic compound formation at the dissimilar metal interface of magnesium to steel spot welds. Mater Des. 2023; 230: 111980. https://doi.org/10.1016/j.matdes.2023. 111980
  18. Chen N, Wang HP, Wang M, Carlson BE, Sigler DR. Schedule and electrode design for resistance spot weld bonding Al to steels. J Mater Process Technol. 2019; 265: 158-172. https://doi.org/10.1016/j.jmatprotec.2018. 10.011
  19. Guo J, Bi J, Wang S, Li Y, Manladan SM, Luo Z. Modeling the effect of electrode morphology on Mg/steel resistance spot welding. Int J Adv Manuf Tech. 2022; 120(1): 137-148. https://doi.org/10.1007/ s00170-021-08547-5
  20. Fei L, Jiang F, Zhang P, Chen C, Zheng Z, Li J, Ma N. Strategies of reducing the heat-affected zone in Mg/steel resistance riveting welding joints for improving joint quality. J Manuf Processes 2024; 124: 1316-1329. https://doi.org/10.1016/j.jmapro. 2024.06.070

 

 

 

مواد پیشرفته در مهندسی
دوره 44، شماره 1
دی 1403
صفحه 43-54

فایل ها

هم رسانی

ارجاع به این مقاله

آمار

ارتقاء امنیت وب با وف ایرانی