Abstract
In the present study, concerning the coefficient of dynamic friction (i between stir rod and welded material which is quite important for clarifying heat transfer processes in friction stir welding, spot friction stir welding and so on, evaluation of the coefficient μ has been conducted based on torque measurement acting on the material. From the measured results using aluminum alloy A7075 as a welded material, it has been shown that the first approximate value of 0.76 can be evaluated for the coefficient of dynamic friction between the stir rod (high speed tool steel, SKH51) and A7075.
