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Numerical analysis of transient temperature characteristic of friction welding in 6061 aluminium alloy

The friction welding method, which enables welding to be executed with less energy and in a shorter time, has been used for the welding of various light metal machinery components, and many experimental research results on this technology have been reported. Meanwhile, as computers develop, more attempts have been made to analyse friction welding processes numerically, and proposals have been made for methods of estimating friction torque during friction welding. To estimate the heat input during friction welding and the transient temperature characteristic in the vicinity of the friction welded joints, the authors have proposed a simple method of combining the friction heat input model and the non-steady heat conduction analysis using the finite element method. This is a method which gives as parameters the base material’s material property, the friction pressure, and the rotation speed to estimate the temperature distribution in the vicinity of the friction welded joint. This method has so far been applied to the similar material friction welding of S25C and SUS304, and its validity has been confirmed. In this study, by applying this method to the friction welding of two similar materials of 6061 aluminium alloys, its validity will be examined by comparing the experimental results with the analytical results of the friction heat input and the temperature characteristic in the vicinity of the friction welded joint.