Friction stir welding is a solid-state welding technique that utilizes
thermomechanical influence of the rotating welding tool on parent material
resulting in a monolith joint - weld. On the contact of welding tool and
parent material, significant stirring and deformation of parent material
appears, and during this process, mechanical energy is partially transformed
into heat. Generated heat affects the temperature of the welding tool and
parent material, thus the proposed analytical model for the estimation of the
amount of generated heat can be verified by temperature: analytically
determined heat is used for numerical estimation of the temperature of parent
material and this temperature is compared to the experimentally determined
temperature. Numerical solution is estimated using the finite difference
method - explicit scheme with adaptive grid, considering influence of
temperature on material's conductivity, contact conditions between welding
tool and parent material, material flow around welding tool, etc. The
analytical model shows that 60-100% of mechanical power given to the welding
tool is transformed into heat, while the comparison of results shows the
maximal relative difference between the analytical and experimental
temperature of about 10%.