Influencing Factors of the Specific Total Loss of Non-Oriented Electrical Steels Processed by Laser Cutting

Abstract

Specific total loss is one of the most important evaluation indexes for the magnetic properties of non-oriented electrical steel sheets. The aim of this study is to investigate the influencing mechanisms of laser cutting parameters as well as the sample characteristics on the specific total loss of thin non-oriented electrical steel sheets processed by laser cutting using a machine learning method. Eight input parameters were finally considered; namely, silicon and manganese contents, thickness of the steel sheets, laser nozzle diameter, laser power, cutting speed, the pressure of process gas, and laser defocus, while one output parameter, the specific total loss, was evaluated. It was found that the specific total loss was positively correlated with the sample thickness, but negatively correlated with silicon and manganese contents, the process gas pressure and laser nozzle diameter. In addition, laser power and cutting speed exhibit complicated non-linear relationships with the specific total loss.

Mechanical and Magnetic Properties Variation in Non-Oriented Electrical Steels with Different Cutting Technology: A Review

“…The main conclusion of the study was that a stress relief annealing is usually recommended to remove the unwanted effects of cutting. Xiang et al [ 65 ] analyzed the influence of the laser parameters in the case of six types of electrical steel laboratory prepared with a mass density comprised between 7.60 and 7.85 g/cm 3 cut through laser technology. They visualized the magnetic domain structure for two types of NO FeSi (with a mass density of 7.70 and 7.80 g/cm 3 ) based on Bitter method and prepared Fe 3 O 4 magnetic fluid ( Figure 5 II).…”

“… MOKE and Bitter micrographs of NO FeSi alloys: ( I ) Kerr images of magnetization distributions near the cut edge obtained through ( A ) spark erosion, ( B ) punching, and ( C ) laser cutting at two values of the applied magnetic field: ( a , c ) for 130 A/m, ( b , d ) for 1600 A/m (( a , b ) were considered before SRA, while ( c , d ) were taken after SRA) [ 40 ]. Reprinted from [ 40 ] Copyright (2024), with permission from Elsevier; ( II ) Magnetic domain images obtained by Bitter technique on ( a , c ) un-damaged and ( b , d ) cut-edge zones of samples cut through laser method in the case of ( a , b ) 7.70 g/cm 3 and ( c , d ) 7.80 g/cm 3 alloys densities [ 65 ]. Figure is licensed under CC—by 4.0.…”