Currently, a growing number of industries are interested in new non-destructive test techniques that can replace current inspection processes based on magnetic particle and penetrant liquids. Inductive Thermography (IT) used for metal material inspection allows complex geometries to be analysed and provides an excellent surface crack detection capability. The potential of the finite element simulation tools for use in IT inspection is extremely useful for the design of coils and for knowing the distribution of induced currents, as well as the temperature gradients. Thus, FLUX 3D contributes to analysing the detectability of the surface cracks in workpieces with complex geometry, which reduces the number of tests in the laboratory.