Industrial processes generally are comprised of several steps that promote the transformation of materials, whether in their primary form, or as by-products, which will subsequently form the final product. In this context, the tire manufacturing industry, there is a very specific step is the cutting of rubber; this step can be performed in various ways and techniques one of which is the cutting by ultrasound. Although efficient cutting and the cut material presenting a finish of the cut surfaces higher than the other cutting systems ultrasound have excessive fractures component that performs cutting, called sonotrode. In this study, we investigated some of the possible (root cause) for failures made by sonotrode. The study involved a qualitative chemical analysis of the material, stress analysis using the finite element method, metallographic tests and mechanical characterization of the material. The results obtained allowed the identification of the accumulated damage mechanism in the component during its service life, allowing indication of possible root because that lead the sonotrode to fail prematurely.