Critical design parameters of the electrode for liquid metal embrittlement cracking in resistance spot welding

Abstract

The present work studied the influence of the geometric design of the electrode on Zn-assisted liquid metal embrittlement (LME) cracking during resistance spot welding (RSW). LME cracking of the galvannealed transformation-induced plasticity (TRIP) steel welds, induced by two types of electrodes, a radius type with different radius of curvature (R), and a dome type with variable tip diameter (d), was studied both experimentally and by simulation. The current density decreased and the contact area at the electrode/sheet (E/S) interface increased with the increasing R, resulting in low temperatures and thermal stress, which subsequently led to decreased LME tendency. On the contrary, the current density decreased but the initial contact area at the E/S interface remained unchanged with increasing d, causing only a minor reduction in the temperature and hence less influence on LME cracking. These results suggested that R is the most critical design parameter of the electrode that controls LME cracking. Moreover, the radius type electrode displayed lower LME sensitivity as compared with the dome type electrode. This is attributed to the fact that the radius type electrode provides the benefits of increase in both R and d.

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References

  1. 1.

    Pouranvari M, Marashi SPH (2013) Critical review of automotive steels spot welding: process, structure and properties. Sci Technol Weld Join 18:361–403. https://doi.org/10.1179/1362171813Y.0000000120

    CAS  Article  Google Scholar 

  2. 2.

    Seo JC, Choi ID, Son HR, Ji C, Kim C, Suh SB, Seo J, Park YD (2015) A comparative study of constant current control and adaptive control on electrode life time for resistance spot welding of galvanized steels. J Weld Join 33:47–55

    Article  Google Scholar 

  3. 3.

    Chang IS, Cho YJ, Park HS, So DY (2016) Importance of fundamental manufacturing technology in the automotive industry and the state of the art welding and joining technology. J Weld Join 34:21–25. https://doi.org/10.5781/JWJ.2016.34.1.21

    Article  Google Scholar 

  4. 4.

    Ji C, Park C, Kim C, Cho Y, Oh D, Kim MH, Kim YD, Park YD (2017) A comparative study of weldable current range on AC and MFDC resistance spot welding for 440 MPa grade steel sheet. J Weld Join 35:34–42. https://doi.org/10.5781/JWJ.2017.35.1.34

    Article  Google Scholar 

  5. 5.

    Jenney CL, O’Brien A (1991) Welding handbook: Welding Processes (Part-2), 9th edn. American Welding Society (AWS), Miami

    Google Scholar 

  6. 6.

    Zhang H, Senkara J (2017) Resistance welding: fundamentals and applications, 2nd edn. CRC Press, Taylor & Francis Group, Boca Raton

    Google Scholar 

  7. 7.

    Resistance Welding Manufacturing Alliance (2003) Resistance Welding Manual, 4th edn. American Welding Society (AWS), Philadelphia

    Google Scholar 

  8. 8.

    Marder AR (2000) Metallurgy of zinc-coated steel. Prog Mater Sci 45:191–271. https://doi.org/10.1016/S0079-6425(98)00006-1

    CAS  Article  Google Scholar 

  9. 9.

    Tumuluru M (2007) The effect of coatings on the resistance spot welding behavior of 780 MPa dual-phase steel. Weld J 86:161–169

    Google Scholar 

  10. 10.

    Parker JD, Williams NT, Holliday RJ (1998) Mechanisms of electrode degradation when spot welding coated steels. Sci Technol Weld Join 3:65–74. https://doi.org/10.1179/stw.1998.3.2.65

    CAS  Article  Google Scholar 

  11. 11.

    Ashiri R, Haque MA, Ji CW, shamanian M, Salimijazi HR, Park YD (2015) Supercritical area and critical nugget diameter for liquid metal embrittlement of Zn-coated twining induced plasticity steels. Scr Mater 109:6–10. https://doi.org/10.1016/j.scriptamat.2015.07.006

    CAS  Article  Google Scholar 

  12. 12.

    Ashiri R, Shamanian M, Salimijazi HR, Haque MA, Bae JH, Ji CW, Chin KG, Park YD (2016) Liquid metal embrittlement-free welds of Zn-coated twinning induced plasticity steels. Scr Mater 114:41–47. https://doi.org/10.1016/j.scriptamat.2015.11.027

    CAS  Article  Google Scholar 

  13. 13.

    Ling Z, Wang M, Kong L (2018) Liquid metal embrittlement of galvanized steels during industrial processing: a review. In: Trans. Intell. Weld. Manuf. pp 25–42

  14. 14.

    Bhattacharya D (2018) Liquid metal embrittlement during resistance spot welding of Zn-coated high-strength steels. Mater Sci Technol 1–21. https://doi.org/10.1080/02670836.2018.1461595

  15. 15.

    Kim YG, Kim IJ, Kim JS, Chung YI, Choi DY (2014) Evaluation of surface crack in resistance spot welds of Zn-coated steel. Mater Trans 55:171–175. https://doi.org/10.2320/matertrans.M2013244

    CAS  Article  Google Scholar 

  16. 16.

    DiGiovanni C, Han X, Powell A, Biro E, Zhou NY (2019) Experimental and numerical analysis of liquid metal embrittlement crack location. J Mater Eng Perform 28:2045–2052. https://doi.org/10.1007/s11665-019-04005-2

    CAS  Article  Google Scholar 

  17. 17.

    Wintjes E, DiGiovanni C, He L, Biro E, Zhou NY (2019) Quantifying the link between crack distribution and resistance spot weld strength reduction in liquid metal embrittlement susceptible steels. Weld World 63:807–814. https://doi.org/10.1007/s40194-019-00712-5

    CAS  Article  Google Scholar 

  18. 18.

    DiGiovanni C, Biro E, Zhou NY (2019) Impact of liquid metal embrittlement cracks on resistance spot weld static strength. Sci Technol Weld Join 24:218–224. https://doi.org/10.1080/13621718.2018.1518363

    CAS  Article  Google Scholar 

  19. 19.

    Takashima K, Sawanishi C, Taniguchi K et al (2017) Development of resistance spot welding technology to suppress LME crack in ultra high strength steel sheets. Prepr Natl Meet JWS. https://doi.org/10.14920/jwstaikai.2017s.0_16

  20. 20.

    Barthelmie J, Schram A, Wesling V (2016) Liquid metal embrittlement in resistance spot welding and hot tensile tests of surface-refined TWIP steels. IOP Conf Ser Mater Sci Eng 118:012002. https://doi.org/10.1088/1757-899X/118/1/012002

    Article  Google Scholar 

  21. 21.

    Aa EM Van Der, Hanlon DN, Veldt T Van Der (2017) Resistance spot weldability of 3rd generation advanced high strength steels for automotive applications. Steels Cars Truck. Conf

  22. 22.

    Sierlinger R, Gruber M (2017) A cracking good story about liquid metal embrittlement during spot welding of advanced high strength steels. Join. Car Body Eng

  23. 23.

    Zhang H, Senkara J, Wu X (2002) Suppressing cracking in resistance welding AA5754 by mechanical means. J Manuf Sci Eng 124:79. https://doi.org/10.1115/1.1418693

    Article  Google Scholar 

  24. 24.

    Goodwin EF, Silva AE (2017) Current topics and priorities in forming and joining of advanced galvanized sheet steels. Int Conf Zinc Zinc Alloy Coat. Steel Sheet

  25. 25.

    Lippold JC, Baeslack WA, Varol I (1992) Heat-affected zone liquation cracking in austenitic and duplex stainless steels. Weld Res Suppl 1–14

  26. 26.

    Wolski K, Laporte V (2008) Grain boundary diffusion and wetting in the analysis of intergranular penetration. Mater Sci Eng A 495:138–146. https://doi.org/10.1016/J.MSEA.2007.10.107

    Article  Google Scholar 

  27. 27.

    Zhang W (2003) Design and implementation of software for resistance welding process simulations. SAE Int J Mater Manuf 105–113. https://doi.org/10.4271/2003-01-0978

  28. 28.

    Zhang W (2012) Recent advances and improvements in the simulation of resistance welding processes. Weld World 50:29–37. https://doi.org/10.5772/2884

    CAS  Article  Google Scholar 

  29. 29.

    American Welding Society (2012) AWS D8.9M:2012-Recommended Practices for Test Methods for Evaluating the Resistance Spot Welding Behavior of Automotive Sheet Steel Materials. American Welding Society, Miami

    Google Scholar 

  30. 30.

    Bowers R, Sorensen C, Eagar T (1990) Electrode geometry in resistance spot welding. Weld J 45–51

  31. 31.

    Li Y, Wei Z, Li Y, Shen Q, Lin ZQ (2013) Effects of cone angle of truncated electrode on heat and mass transfer in resistance spot welding. Int J Heat Mass Transf 65:400–408. https://doi.org/10.1016/j.ijheatmasstransfer.2013.06.012

    CAS  Article  Google Scholar 

  32. 32.

    Kimchi M (1984) Spot weld properties when welding with expulsion- a comparative study. Weld Res Suppl:58–63

  33. 33.

    Tuchtfeld M, Heilmann S, Füssel U, Jüttner S (2019) Comparing the effect of electrode geometry on resistance spot welding of aluminum alloys between experimental results and numerical simulation. Weld World 63:527–540. https://doi.org/10.1007/s40194-018-00683-z

    CAS  Article  Google Scholar 

  34. 34.

    Frei J, Rethmeier M (2018) Susceptibility of electrolytically galvanized dual-phase steel sheets to liquid metal embrittlement during resistance spot welding. Weld World 62:1031–1037. https://doi.org/10.1007/s40194-018-0619-1

    CAS  Article  Google Scholar 

  35. 35.

    Tarimer I, Arslan S, Emin Güven M, Karabaş M (2011) A case study of a new spot welding electrode which has the best current density by magnetic analysis solutions. J Electr Eng 62:233–238. https://doi.org/10.2478/v10187-011-0037-8

    Article  Google Scholar 

Download references

Funding

This work was supported by the Korea Basic Science Institute (KBSI) National Research Facilities & Equipment Center (NFEC) grant funded by the Ministry of Education, Korea government (No. 2019R1A6C1010045).

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Correspondence to Yeong-Do Park.

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Recommended for publication by Commission III - Resistance Welding, Solid State Welding, and Allied Joining Process

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Murugan, S.P., Mahmud, K., Ji, C. et al. Critical design parameters of the electrode for liquid metal embrittlement cracking in resistance spot welding. Weld World 63, 1613–1632 (2019). https://doi.org/10.1007/s40194-019-00797-y

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Keywords

  • Liquid metal embrittlement
  • Resistance spot welding
  • Welding electrode
  • Dome type
  • Radius type
  • Current density