Revealing effect of Sn on the mechanical properties of resistance spot welds for 460 MPa grade HSLA steel

Abstract

Driven by efforts toward carbon-neutral steelmaking, increased scrap usage elevates Sn content in steels. While the general effects of Sn on steel have been studied, its specific influence on resistance spot welding (RSW) remains unclear. This study investigates Sn’s impact on the mechanical properties of RSW joint of 460 MPa HSLA steel. Cross-tension tests reveal that both the RSW joint without Sn and the RSW joint·containing 0.09wt% Sn exhibit pull-out failure. The RSW joint containing 0.09wt% Sn showing higher peak load and energy absorption attributed to Sn’s solid–solution strengthening. Conversely, the RSW joint containing 0.52wt% Sn exhibited the partial interface failure mode, significantly reducing the peak load and energy absorption. The primary reason is the segregation of Sn in the interdendritic regions of the fusion zone, which weakens atomic cohesion and reduces fracture toughness. Such severe segregation arises from RSW’s high cooling rates, which shift the primary solidification phase from δ-ferrite to austenite. Fortunately, double-pulse RSW mitigates Sn segregation, restoring failure mode and mechanical performance. This study assesses the impact of Sn on RSW joint properties, and these findings highlight the broader significance of understanding scrap-related residual element effects in sustainable steel production.

Keywords

Sn / failure mode / segregation / fracture toughness / resistance spot welding

References

[1] Broadbent C. Steel’s recyclability: Demonstrating the benefits of recycling steel to achieve a circular economy. Int. J. Life Cycle Assess.. 2016, 21111658.

[2] Wang ZL, Bao Y. New steelmaking process based on clean deoxidation technology. Int. J. Miner. Metall. Mater.. 2024, 3161249.

[3] Spooner S, Davis C, Li ZS. Modelling the cumulative effect of scrap usage within a circular UK steel industry-residual element aggregation. Ironmaking Steelmaking. 2020, 47101100.

[4] Bell S, Davis B, Javaid A, Essadiqi E. Final Report on Effect of Impurities in Steel. 20062005-41(CF)

[5] Savov L, Volkova E, Janke D. Copper and tin in steel scrap recycling. RMZ-Materials and Geoenvironment. 2003, 503627

[6] Savov L, Janke D. Recycling of scrap in steelmaking in view of the tramp element problem. Metall. 1998, 52: 374

[7] O. Rod, C. Becker, and M. Nylén, Opportunities and Dangers of using Residual Elements in Steels: A Literature Survey [2023-08-15]. https://www.jernkontoret.se/globalassets/publicerat/for-skning/d-rapporter/d819.pdf?id=1138

[8] Houpert C, Lanteri V, Jolivet JMet al. . Influence of tramp elements in the production of high quality steels using the scrap/electric arc furnace route. Rev. Met. Paris. 1997, 94111369.

[9] Yang L, Cheng XQ, Li XG. Beneficial role of Sn in rapid rust stabilization of weathering steel in marine environments. Int. J. Miner. Metall. Mater.. 2025, 3251141.

[10] Song SH, Yuan ZX, Jia J, Shen DD, Guo AM. The role of tin in the hot-ductility deterioration of a low-carbon steel. Metall. Mater. Trans. A. 2003, 3481611.

[11] Jackson WJ, Southall DM. Effect of copper and tin in residual amounts on the mechanical properties of 15Mn–Mo cast steel. Met. Technol.. 1978, 51381.

[12] Sun LJ, Wang FM, Shen W, Li CR, Yang ZB. Effect of heat treatment processes on the microstructure and mechanical properties of low alloy structural steels with different impurity tin contents. Ironmaking Steelmaking. 2022, 494440.

[13] K.M.H. Bhadhon, X. Wang, and J.R. McDermid, Effects of CGL-compatible thermal processing, starting microstructure, and Sn micro-alloying on the mechanical properties of a medium-Mn third generation advanced high strength steel, Mater. Sci. Eng. A, 833(2022), art. No. 142563.

[14] Nam ND, Kim MJ, Jang YW, Kim JG. Effect of tin on the corrosion behavior of low-alloy steel in an acid chloride solution. Corros. Sci.. 2010, 52114.

[15] Abdali A, Nedjad SH, Zargari HH, Saboori A, Yildiz M. Predictive tools for the cooling rate-dependent microstructure evolution of AISI 316L stainless steel in additive manufacturing. J. Mater. Res. Technol.. 2024, 295530.

[16] Shirmohammadi D, Movahedi M, Pouranvari M. Resistance spot welding of martensitic stainless steel: Effect of initial base metal microstructure on weld microstructure and mechanical performance. Mater. Sci. Eng. A. 2017, 703154.

[17] Ma C, Chen DL, Bhole SD, Boudreau G, Lee A, Biro E. Microstructure and fracture characteristics of spot-welded DP600 steel. Mater. Sci. Eng. A. 2008, 4851–2334.

[18] G. Janardhan, K. Kishore, K. Dutta, and G. Mukhopadhyay, Tensile and fatigue behavior of resistance spot-welded HSLA steel sheets: Effect of pre-strain in association with dislocation density, Mater. Sci. Eng. A, 793(2020), art. No. 139796.

[19] Soomro IA, Pedapati SR, Awang M. A review of advances in resistance spot welding of automotive sheet steels: Emerging methods to improve joint mechanical performance. Int. J. Adv. Manuf. Technol.. 2022, 11851335.

[20] Marashi P, Pouranvari M, Amirabdollahian S, Abedi A, Goodarzi M. Microstructure and failure behavior of dissimilar resistance spot welds between low carbon galvanized and austenitic stainless steels. Mater. Sci. Eng. A. 2008, 4801–2175.

[21] F. Badkoobeh, A. Nouri, H. Hassannejad, and H. Mostaan, Microstructure and mechanical properties of resistance spot welded dual-phase steels with various silicon contents, Mater. Sci. Eng. A, 790(2020), art. No. 139703.

[22] Sun X, Stephens EV, Khaleel MA. Effects of fusion zone size and failure mode on peak load and energy absorption of advanced high strength steel spot welds under lap shear loading conditions. Eng. Fail. Anal.. 2008, 154356.

[23] Soomro IA, Pedapati SR. Application of in situ post weld heat treatment using double pulse technology and its effect on microstructure and mechanical performance of resistance spot welded HSLA350 steel. Int. J. Adv. Manuf. Technol.. 2019, 10573149

[24] Chao YJ. Ultimate strength and failure mechanism of resistance spot weld subjected to tensile, shear, or combined tensile/shear loads. J. Eng. Mater. Technol.. 2003, 1252125.

[25] Park DB, Huh MY, Shim JH, Suh JY, Lee KH, Jung WS. Strengthening mechanism of hot rolled Ti and Nb microalloyed HSLA steels containing Mo and W with various coiling temperature. Mater. Sci. Eng. A. 2013, 560528.

[26] M. Malekinia, H.H. Zargari, K. Ito, and S.H. Nedjad, Flux enhancement with titanium or vanadium oxides addition for superior submerged arc welding of HSLA steel plates, J. Adv. Join. Process., 10(2024), art. No. 100238.

[27] Pollard B. Spot welding characteristics of HSLA steel for automotive applications. Weld J.. 1974, 538343-s

[28] Kaščák E, Spišák E. Effect of welding parameters on the quality of spot welds combining AHSS steel and HSLA steel. Key Eng. Mater.. 2013, 586: 162.

[29] Chabok A, Galinmoghaddam E, Hosson JMD, Pei YT. Micromechanical evaluation of DP1000-GI dual-phase high-strength steel resistance spot weld. J. Mater. Sci.. 2019, 5421703.

[30] Guo W, Crowther D, Francis JA, Thompson A, Liu Z, Li L. Microstructure and mechanical properties of laser welded S960 high strength steel. Mater. Des.. 2015, 85534.

[31] Jain VKS, Sarma VS, Amirthalingam M. Resistance spot welding behaviour of novel medium manganese (M-Mn) steels - Role of welding parameters on weld microstructure and mechanical properties. J. Manuf. Process.. 2023, 1011405.

[32] A. Chabok, E.V.D. Aa, and Y.T. Pei, A study on the effect of chemical composition on the microstructural characteristics and mechanical performance of DP1000 resistance spot welds, Mater. Sci. Eng. A, 788(2020), art. No. 139501.

[33] A. Chabok, H.T. Cao, E.V.D. Aa, and Y.T. Pei, New insights into the fracture behavior of advanced high strength steel resistance spot welds, J. Mater. Process. Technol., 301(2022), art. No. 117433.

[34] Radaj D, Zhang S. Descriptive bases of forces and stresses in spot-welded overlap joints. Konstruktion. 1996, 48365

[35] Radaj D, Zhang S. Simplified formulae for stress intensity factors of spot welds. Eng. Fract. Mech.. 1991, 401233.

[36] Pouranvari M. Fracture toughness of martensitic stainless steel resistance spot welds. Mater. Sci. Eng. A. 2017, 68097.

[37] Song ZQ, Zhao HT, Yang Let al. . Effect of Sn on microstructure evolution of a HSLA steel. Metall. Mater. Trans. A. 2024, 55103956.

[38] Demers H, Demers NP, Couture ARet al. . Three-dimensional electron microscopy simulation with the CASINO Monte Carlo software. Scanning. 2011, 333135.

[39] Chen SJ, Ye XX, Tsang DKLet al. . Welding solidification cracking susceptibility and behavior of a Ni–18W–6Cr alloy. J. Mater. Sci. Technol.. 2019, 35129.

[40] Fujda M. Centerline segregation of continuously cast slabs influence on microstructure and fracture morphology. J. Met., Mater. Miner.. 2005, 15245

[41] Yamaguchi M. First-principles calculations of the grain-boundary cohesive energy. J. Jpn. Inst. Metals. 2008, 719657.

[42] Olefjord I. Temper embrittlement. Int. Met. Rev.. 1978, 131149.

[43] Stephenson ET. The effect of tin on the toughness of some common steels. Metall. Trans. A. 1980, 113517.

[44] Yamaguchi M, Kameda J. Multiscale thermodynamic analysis on fracture toughness loss induced by solute segregation in steel. Philos. Mag.. 2014, 94192131.

[45] K. Ito, T. Mitsunobu, Y. Ishiguro, Y. Kohigashi, and K. Tsutsui, Analysis of grain boundary embrittlement by Cu and Sn in paramagnetic γ-Fe by first-principles computational tensile test, Phys. Rev. Mater., 6(2022), No. 9, art. No. 093603.

[46] Takatani H, Gandin CA, Rappaz M. EBSD characterisation and modelling of columnar dendritic grains growing in the presence of fluid flow. Acta Mater.. 2000, 483675.

[47] Nelson TW, Lippold JC, Mills MJ. Nature and evolution of the fusion boundary in ferritic-austenitic dissimilar weld metals, Part 1-Nucleation and growth. Weld J.. 1999, 78319-s

[48] Choudhary SK, Ganguly S, Sengupta A, Sharma V. Solidification morphology and segregation in continuously cast steel slab. J. Mater. Process. Technol.. 2017, 243312.

[49] Nedjad SH, Yildiz M, Saboori A. Solidification behaviour of austenitic stainless steels during welding and directed energy deposition. Sci. Technol. Weld. Join.. 2023, 2811.

[50] Ramachandran DC, Figueredo B, Sherepenko O, Jin W, Park YD, Biro E. A study on improving the mechanical performance by controlling the halo ring in the Q&P 980 steel resistance spot welds. J. Manuf Process.. 2022, 75310.

[51] Ueshima Y, Komatsu N, Mizoguchi S, Kajioka H. Effects of alloying elements on interdendritic microsegregation of carbon steel. Tetsu-to-Hagane. 1987, 73111551.

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