The collaborative robotics emerge in some factories due to many advantages that bringing. This article presents an application of a collaborative robot integrated in a hard steel environment that generates lot of requirements: dusts, vibrations, high temperatures... The robot evolves in the fourth mode of collaboration in which the human/robot interaction is allowed under conditions. With few adaptations, we succeed to start in production the collaborative robot which eases the human operator by carrying a payload in his stead, and consequently reduces operator musculoskeletal disorders.