Effect of Tool Geometry on Strength of Friction Stir Spot Welded Aluminum Alloys

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The effects of tool geometry on the microstructure and tensile shear strength of friction stir spot-welded A6061-T6 Al alloy sheets were investigated in the present study. Friction stir spot welding (FSSW) was carried out at a tool speed of 2500 rpm, plunging rate of 1 mm/s, and dwell time of 3 s. Four types of tools with the same shoulder shape and size, but different pin profiles (threaded cylindrical, smooth cylindrical, threaded triangular, and smooth triangular) were used to carry out FSSW. The mechanical and metallurgical properties of the FSSW specimens were characterized to evaluate the performance of the different tools. Experimental results show that the pin profile significantly alters the hook geometry, which in turn affects the tensile shear strength of the friction stir spot welds. The welds made using the conventional thread cylindrical tool have the largest elongation and yield the highest tensile strength (4.78 kN). The welds made using the smooth cylindrical tool have the lowest tensile strength. The welds made using the threaded triangular and smooth triangular tools both have a tensile-shear load of about 4 KN; however, the welds made using the threaded triangular tool have a better elongation than those made using the smooth triangular tool.

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Edited by:

Zone-Ching Lin, You-Min Huang, Chao-Chang Arthur Chen and Liang-Kuang Chen

Pages:

109-117

Citation:

Y. C. Lin et al., "Effect of Tool Geometry on Strength of Friction Stir Spot Welded Aluminum Alloys", Advanced Materials Research, Vol. 579, pp. 109-117, 2012

Online since:

October 2012

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$38.00

[1] B. Y. Lin, J. J. Liu, L. D. Lu, Mechanical Properties and Fracture Behavior of Friction Stir Spot Welded AZ61 Magnesium Alloys, Advanced Materials Research 154-155 (2011) 498-507.

DOI: https://doi.org/10.4028/www.scientific.net/amr.154-155.498

[2] Y. C. Lin, J. J. Liu, , B. Y. Lin, C. M. Lin, H. L. Tsai, Effects of process parameters on strength of Mg alloy AZ61 friction stir spot welds, Mater. & Design 35 (2012) 350–357.

DOI: https://doi.org/10.1016/j.matdes.2011.08.050

[3] H. Badarinarayan, Y. Shi, X. Li, K. Okamoto, Effect of tool geometry on hook formation and static strength of friction stir spot welded aluminium 5754-O sheets, Int. J. Mach. Tool Manuf. 49 (2009) 814–823.

DOI: https://doi.org/10.1016/j.ijmachtools.2009.06.001

[4] H. Badarinarayan, Q. Yang, S. Zhu, Effect of tool geometry on static strength of friction stir spot-welded aluminium alloy, Int. J. Mach. Tool Manuf. 29 (2009) 142–148.

DOI: https://doi.org/10.1016/j.ijmachtools.2008.09.004

[5] M. Fujimoto, S. Koga, N. Abe, S. Y. Sato, H. Kokawa, Analysis of plastic flow of the Al alloy joint produced by friction stir spot welding, Journal of the Japan Welding Society, 26(1) (2008) 63-67.

DOI: https://doi.org/10.2207/qjjws.26.67

[6] S. Hirasawa, H. Badarinarayan, K. Okamoto, T. Tomimura, T. Kawanami, Analysis of effect of tool geometry on plastic flow during friction stir spot welding using particle method, Journal of Materials Processing Technology, 210 (2010) 1455-1463.

DOI: https://doi.org/10.1016/j.jmatprotec.2010.04.003

[7] W. Yuana, R. S. Mishra, S. Webb, Y. L. Chen, B. Carlson, D. R. Herling, G. J. Grant, Effect of tool design and process parameters on properties of Al alloy 6016 friction stir spot welds, Journal of Materials Processing Technology, 211 (2011).

DOI: https://doi.org/10.1016/j.jmatprotec.2010.12.014

[8] Y. H. Yin, A. Ikuta, T. H. North, Microstructural features and mechanical properties of AM60 and AZ31 friction stir spot weld, Materials and Design, 31 (2010) 4764–4776.

DOI: https://doi.org/10.1016/j.matdes.2010.05.005

[9] Q. Yang, S. Mironov, Y. S. Sato, K. Okamoto, Material flow during friction stir spot welding, Materials Science and Engineering A 527 (2010) 4389–4398.

DOI: https://doi.org/10.1016/j.msea.2010.03.082

[10] Y. H. Yin, N. Sun, T. H. North, S. S. Hu, Microstructures and mechanical properties in dissimilar AZ91/AZ31 spot welds, Materials Characterization, 61 (2010) 1018–1028.

DOI: https://doi.org/10.1016/j.matchar.2010.06.016

[11] P. Su, A. Gerlich, T. H. North, and G. J. Bendzsak, Intermixing in Dissimilar Friction Stir Spot Welds, Metallurgical and Materials Transactions A, 38A (2007) 584-595.

DOI: https://doi.org/10.1007/s11661-006-9067-4

[12] Y. Tozaki, Y. Uematsu, K. Tokaji, Effect of tool geometry on microstructure and static strength in friction stir spot welded aluminium alloys, International Journal of Machine Tools & Manufacture, 47 (2007) 2230–2236.

DOI: https://doi.org/10.1016/j.ijmachtools.2007.07.005

[13] R. Nandan, T. DebRoy, H. K. D. H. Bhadeshia, Recent advances in friction-stir welding-Process, weldment structure and properties, Progress in Materials Science, 53 (2008) 980–1023.

DOI: https://doi.org/10.1016/j.pmatsci.2008.05.001