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Abstract
A new method which applied the finite element method (FEM) was proposed to estimate the precise temperature distribution in the friction weld. With this method, the heat input at the weld interface was estimated by the friction torque measured by the experimental method. The calculation was performed as a non-stationary heat conduction problem of two-dimensional axis symmetry. The calculation method takes heat loss by heat transfer and emission from the side wall of the material into consideration. The heat conduction coefficient and the specific heat of the material are automatically changed in the calculation with increases in temperature of the weld. The system also has functions to change heat input distribution at the friction interface with increases in temperature of the interface.
The main results obtained are summarised as follows.
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A calculation system to estimate the temperature distribution of the friction weld using the FEM, in which the heat input data was calculated from the friction torque measured by the welding experiment, was constructed.
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Some new algorithms were constructed in which physical properties are changed according to the temperature and the heat input distribution is changed according to the temperature distribution. As a result of calculation, the effectiveness of the system to estimate temperature distribution was confirmed.
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Effects of friction time and friction pressure on temperature distribution of the welds were confirmed by calculation.