Effect of an electrical insulating coating on the efficiency of laser treatment of grain-oriented electrical steel

Effect of an electrical insulating coating on the efficiency of laser treatment of an electrical grain-oriented steel has been studied. The similarity and distinctions of the mechanisms of the action of laser treatment and electrical insulating coating on the magnetic losses in steel have been analyzed. It has been shown, both on separate samples and on commercial parties that the coating reduces the efficiency of laser treatment and that the lower the tensile stresses produced by the coating in the metal, the more pronounced the effect of laser treatment. The results obtained also show the absence of the additivity upon the combined action of laser treatment and electrical insulating coating on the metal.