Abstract
In friction welding, heat input is significant factor, which affects the quality of welded joints. It is difficult to calculate the heat input, because friction heating is complicated phenomenon. Therefore, there is no general calculation method in friction welding. As one of the parameter for calculation, friction torque is used. However, torque meter is not generally installed into friction welding machine. Torque is not the parameter, which can be used with all friction welding machine. Authors have proposed the method of alternative calculating, which is calculated using the upset distance. In this study, the two calculating methods were compared and the validity of both the calculating method was examined. It was revealed that heat input could calculate in accuracy equivalent to using torque by calculation using upset distance.
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