Dissimilar intermixing during friction stir spot welding of Al 5754 and Al 6111 sheets is investigated using a combination of experimentation and numerical modeling. Dissimilar intermixing is not observed in (a) spot welds made using a tool having a smooth pin with or without a dwell period and (b) spot welds made using a threaded tool without the application of a dwell period. It is proposed that dissimilar intermixing during the dwell period in spot welding results from the incorporation of upper (Al 5754) and lower (Al 6111) sheet materials at the top of the thread on the rotating pin. A ribbon of contiguous Al 5754 and Al 6111 lamella is moved downward via the pin thread as the tool rotates during the dwell period in spot welding. A helical vertical rotational flow is created during the dwell period in spot welding because the ribbon of contiguous Al 5754 and Al 6111 lamellae discharged from the bottom of the pin thread moves outward and upward before moving back toward the tool periphery and downward again.
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W.M. Thomas, E.D. Nicholas, J.D. Needham, M.G. Murch, P. Templesmith, and C.J. Daws: G.B. Patent Application No. 9,125,978.8, Dec. 1991; U.S. Patent No. 5,460,317, Oct. 1995
C.G. Rhodes, M.W. Mahoney, W.H. Bingel: Scripta Mater., 1997, vol. 36, pp. 69–75
T. Shibayanagi, M. Maeda: Trans. JWRI, 2004, vol. 33, pp. 17–23
R.S. Mishra, M.W. Mahoney: Mater. Sci. Forum, 2001, vols. 357–359, pp. 507–14.
J.-Q. Su, T.W. Nelson, M. Mishra, M. Mahoney: Acta Mater., 2003, vol. 51, pp. 713–29
Ø. Frigaard, Ø. Grong, J. Hjelen, S. Gulbrandsen-Dahl, and O.T. Midling: Proc. 1st Int. Symp. on Friction Stir Welding, TWI, Thousand Oaks, CA, 1999
C. Dalle-Donne, B. Braun, G. Staniek, A. Jung, W.A. Kayser: Materialwiss. Werkstofftech., 1998, vol. 29, pp. 609–17.
Y.S. Sato, M. Urata, H. Kokawa: Metall. Mater. Trans A. 2002, vol. 33A, pp. 625–35.
M. Song and R. Kovacevic: Trans. SME, 2002, pp. 621–32
P. Colegrove, H. Shercliff: Sci. Technol. Weld. Joining, 2003, vol. 8 (5), pp. 360–68
P. Colegrove, H. Shercliff, and P.L. Threadgilll: Proc. 4th Int. Conf. Friction Stir Welding, TWI, Cambridge, United Kingdom, 2004
K.A. Hassan, P.B. Prangnell, A.F. Norman, D.A. Price, S.W. Williams: Sci. Technol. Weld. Joining, 2003, vol. 8, pp. 257–68
K. Nakata, S. Inoki, Y. Nagano, T. Hashimoto, S. Johogan, M. Ushio: J. Jpn. Inst. Light Met., 2001, vol. 51 (10), pp. 528–33
K. Okamoto, M. Doi, S. Hirano, K. Aota, H. Okamura, Y. Aono, and T.C. Ping: 3rd Int. Symp. on Friction Stir Welding, Kobe, Japan, 2001, TWI, Cambridge, United Kingdom, 2001
P. Su, A. Gerlich, and T.H. North: SAE Technical Series, 2005-01-1255, SAE, Warrendale, PA, 2005
A. Gerlich, P. Su, T.H. North, G.J. Bendzsak: Mater. Forum, J.F. Nie and M. Barnett, eds., Institute of Materials Engineering Australasia Ltd, 2005, vol. 29, pp. 290–94
A. Gerlich, P. Su, T.H. North: J. Mater. Sci., 2005, vol. 40, pp. 6473–81
A. Gerlich, P. Su, T.H. North: Sci. Technol. Weld. Joining, 2005, vol. 10 (6), pp. 647–52
A. Gerlich, G. Avramovic-Cingara, T.H. North: Metall. Mater. Trans. A, 2006, vol. 37A, pp. 2773–86
H. Larssen, L. Karlsson, S. Stolz, and E.L Berqvist: Proc. 2nd Int. Conf. on Friction Stir Welding, Gothenburg, Sweden, 2000, TWI, Cambridge, United Kingdom, 2000
T.H. North, G.J. Bendzsak, C.B. Smith, and G.H. Luan: Proc. 7th Int. Symp. of JWS, Japan Welding Society, Tokyo, Japan, 2001, pp. 621–32
L.E. Murr, Y. Li, R.D. Flores, E.A. Trillo, J.C. McClure: Mater. Res. Innovations, 1998, vol. 2, pp. 150–63
A.C. Somasekharan, L.E. Murr: Magn. Technol. 2004, TMS, Warrendale, PA, 2004, pp. 31–36
H. Schmidt, J. Hattel, J. Wert: Modeling Simul. Mater. Sci. Eng., 2004, vol. 12, pp. 143–57
H. Schmidt, J. Hattel: Modell. Simul. Mater. Sci. Eng., 2005, vol. 13, pp. 77–93
A. Askari, S. Silling, B. London, M. Mahoney: In K. Jata et al., eds., Friction Stir Welding and Processing, TMS, Warrendale, PA, 2001, pp. 43–54
G.J. Bendzsak, T.H. North, Z. Li: Acta Metall. Mater., 1997, vol. 45 (4), pp. 1735–45.
G.J. Bendzsak, T.H. North, and C.B. Smith: Proc. 2nd Int. Conf. on Friction Stir Welding, Gothenburg, Sweden, 2000, TWI, Cambridge, United Kingdom, 2000
T.H. North, G.J. Bendzsak, and C.B. Smith: Proc. 2nd Int. Conf. on Friction Stir Welding, Gothenburg, Sweden, 2000, TWI, Cambridge, United Kingdom, 2000
D. Schmitter, I.M. Zylla: J. Phys. IV France, 2004, vol. 120, pp. 677–80
B. London, M. Mahoney, W. Bingel, M. Calabrese, and D. Waldron: 3rd Int. Symp. on Friction Stir Welding, 2001, Kobe, Japan, TWI, Cambridge, United Kingdom, 2001
K. Colligan: Weld. J., 1999, July, pp. 229s–237s
M. Guerra, C. Schmidt, J.C. McClure, L.E. Murr, A.C. Nunes: Mater. Charact., 2003, vol. 48, pp. 95–101
T.U. Seidel, A.P. Reynolds: Metall. Mater. Trans. A, 2001, vol. 32A, pp. 2879–84
T.U. Seidel, A.P. Reynolds: Sci. Technol. Weld. Joining, 2003, vol. 8 (3), pp. 175–83
D. Turnbull: Trans. TMS-ASME, 1961, vol. 221, pp. 422–38
J. Zhang, A.T. Alpas: Acta Metall., 1997, vol. 45 (2), pp. 513–28
P. Su, A. Gerlich, T.H. North, G.J. Bendzsak: Sci. Technol. Weld. Joining, 2006, vol. 11 (1), pp. 61–71
T.H. North, G.J. Bendzsak, Z. Li, Y. Zhai: Metall. Mater. Trans. A, 1997, 28A (11), pp. 2371–84
W.J. Arbegast: Hot Deformation of Aluminum Alloys III, TMS, Warrendale, PA, pp. 313–27
A. Gerlich, P. Su, T.H. North, and G.J. Bendzsak: Proc. Friction Stir Welding Colloquium, University of Graz, Graz, Austria, May 23, 2006, pp. 65–86.
R. Nagathil, G. Hou, and A. Demuren: SAE Technical Series, 2005-01-1245, SAE, Warrendale, PA, 2005.
A. Schneider, A.C. Nunes: Metall. Trans. A, 2004, vol. 35 (8), pp. 777–83
P. Su, A. Gerlich, T.H. North, and G.J. Bendzsak: SAE Technical Series, 2006-01-0971, SAE, Warrendale, PA, 2006.
J.F. dos Santos: Proc. Friction Stir Welding Colloquium, University of Graz, Graz, Austria, May 23, 2006.
P.-E. Droenen, N. Ryum: Metall. Mater. Trans. A, 1994, vol. 25A, pp. 521–30
B. Bjørneklett, Ø. Frigaard, Ø. Grong, O.R. Myhr, and O.T. Midling: Proc. 6th Int. Conf. on Aluminium Alloys, Trans Tech Publications, Switzerland, 1998, pp. 1531–36
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The authors acknowledge the financial support from the Natural Sciences and Engineering Research Council of Canada during this project.
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Su, P., Gerlich, A., North, T. et al. Intermixing in Dissimilar Friction Stir Spot Welds. Metall Mater Trans A 38, 584–595 (2007). https://doi.org/10.1007/s11661-006-9067-4
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DOI: https://doi.org/10.1007/s11661-006-9067-4