Thermal modeling of friction stir welding of Sc-modified Al-Zn-Mg-Cu alloy

Carter Hamilton¹, Stanisław Dymek², Oleg Senkov³

¹Department of Mechanical and Manufacturing Engineering Miami University, Oxford, OH.
²Faculty of Metals Engineering and Industrial Computer Science AGH University of Science and Technology, Kraków, Poland.
³UES, Inc., 4401 Dayton-Xenia Rd., Dayton, OH 45432-1894, USA.

DOI:

https://doi.org/10.7494/cmms.2009.4.0267

Abstract:

Small additions of scandium to Al-Zn-Mg-Cu 7000 series alloys can significantly improve mechanical properties and augment the strength retention at low and elevated temperatures. This research program evaluates the residual properties of Sc-modified Al-Zn-Mg-Cu alloy extrusions joined through friction stir welding (FSW). Mechanical testing was performed on the baseline material and on panels friction stir welded at 175, 225, 250, 300, 350 and 400 RPM (all other weld parameters were held constant). A thermal model of friction stir welding was developed utilizing an energy-based scaling factor to account for tool slip. The proposed slip factor is derived from an empirical relationship between the ratio of the maximum welding temperature to the solidus temperature and energy per unit length of weld. The thermal model successfully predicts the maximum welding temperatures over a range of energy levels, and the mechanical behavior is correlated to the temperature distribution predicted by the model.

Cite as:

Hamilton, C., Dymek, S., Senkov, O., (2009). Thermal modeling of friction stir welding of Sc-modified Al-Zn-Mg-Cu alloy. Computer Methods in Materials Science, 9(4), 416 – 423. https://doi.org/10.7494/cmms.2009.4.0267

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