Owing to the unique nature of UVAT processes in creating micro-dimples on the surface, surface geometric properties and 3D parameters of roughness improve and surface hardness increases. These factors cause increased wear resistance and decreased friction coefficient.

The results obtained from topography of surface texture and micro-hardness shows that the increased feed rate leads to the improvement of 3D parameters of roughness and surface hardness. As a result, wear resistance and friction coefficient decrease.

ANOVA results for average friction coefficient indicate that type of UVAT process with 32.32% effectiveness has the most effect on average friction coefficient. Feed rate and cutting speed with the effectiveness of 17.46% and 11.73% are other parameters which affect output parameter of average friction coefficient.