The use of flexible manufacturing laser systems for surface treatment applications in different production areas, is sometimes the unique mean to reach the competitive degree required by the present market subjected to rapid evolution. The diffusion of laser surface treatment evidently depends on the diffusion of flexible manufacturing systems, and this depends also on the disposability of such technologies able to make the system technically and economically advantageous; moreover strongly innovative techniques are required which can easily be integrated in an automatic and flexible process. In the heat treatment field, traditional techniques often show heavy limitations for the use `on-line' in a manufacturing process. Heat treatment, in fact, are often carried out off-line; consequently the components, after mechanical machining, must be transported to the heat treatment shops, and afterwards they are carried back again to the machining line, for the finishing operations. Laser technology allows selectively surface treatment directly on production line with consequent high reductions in times and costs.