A thermal model of friction stir welding in aluminum alloys |
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Authors: | C. Hamilton S. Dymek A. Sommers |
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Affiliation: | aDepartment of Mechanical and Manufacturing Engineering, Miami University, Oxford OH 45056, USA;bFaculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, 30-059 Kraków, Al. Mickiewicza 30, Poland |
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Abstract: | A thermal model of friction stir welding was developed that utilizes a new slip factor based on the energy per unit length of weld. The slip factor is derived from an empirical, linear relationship observed between the ratio of the maximum welding temperature to the solidus temperature and the welding energy. The thermal model successfully predicts the maximum welding temperature over a wide range of energy levels but under predicts the temperature for low energy levels for which heat from plastic deformation dominates. The thermal model supports the hypothesis that the relationship between the temperature ratio and energy level is characteristic of aluminum alloys that share similar thermal diffusivities. The thermal model can be used to generate characteristic temperature curves from which the maximum welding temperature in an alloy may be estimated if the thermal diffusivity, welding parameters and tool geometry are known. |
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Keywords: | Friction stir welding Thermal model Slip factor Heat flux Aluminum alloys |
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