The average height of the profile (roughness) is an increasingly required dimensional parameter in the
construction world; it is linked to the profile of the load-bearing structure surfaces, punctures, milling and cuts made thermally (plasma cut oxyfuel or laser cut).
For carpentries operating in the civil construction sector, it is mandatory to certify their machinery and machine tools in accordance with UNI EN ISO 1090.
The reason is that a welded structure load loads dynamically with loads of variable intensity and period generate cyclic stresses that induce our structure fatigue stresses.
In manufacturing the stresses of fatigue are very dangerous because unpredictable if not considered. fatigue breaks can spread from a slight surface defect, an edge, an acute angle, a badly-jointed weld. Basically what can lead to fatigue breaks is the profile of the artifact itself.. The control of the roughness obtained from your workings and therefore from your tools (drilling, cutting, punching, bending..) is required to ensure the manufacture (D.M. NTC2018 – UNI EN ISO 1090)