Effect of laser cutting on microstructure and on magnetic properties of grain non-oriented electrical steels

Quantifying Effects of Cutting and Welding on Magnetic Properties of Electrical Steels

“…Even though the presented results are compared to a selected number of references, extensive comparison is outside the scope of this study since the first plausible explanation for the large variations is the mechanical properties of the magnetic material and its variation with parameters like chemical composition and grain size. The grain size is hardly ever reported, [10], [12], and [18] being exceptions, though it has been known for many years now that it is a major factor for the magnetic properties [31] and level of manufacturing degradation [18].…”

“…It is found that laser cutting on 0.3% and 3% Si laminations is more appropriate than mechanical cutting when the samples are 5 mm wide, while X-ray analysis reveals that laser causes higher residual stresses than mechanical cutting. In [10], eight settings with varying power, speed, and assisting gas pressure are tested on CO2 laser as well. Three different materials of 0.65 mm thickness were characterized, all with less than 1% Si content.…”

Effect of Unconventional Methods of Cutting on Microstructure, Topography and Microhardness Changes in Steel

“…The effect of materials processing with a laser depends on many factors, which are not easy to control. In cutting most of the laser beam passes through the plate without being absorbed by the work piece or scattered by the plasma [6]. As was proposed by Rosenthal [9] and Duley [10] in the cutting process the energy sent per unit of time comes from the laser beam and from the oxidation reaction.…”

“…Belhadj et al [6] used the laser cutting for electrical steels avoiding the shearing deformation in cutting area and thermal stress in the steels should decrease what limited the harmful effect of these stresses. This method can be also applied to cut the austenitic stainless steel because obtained kerfs are of good quality [7].…”

Laser remote cutting and surface treatment in manufacturing electrical machines—High productivity, flexibility, and perfect magnetic performance

“…[10][11][12] On the contrary, laser cutting induces thermal stress due to temperature gradients within the material during processing, which finally also results in deterioration of the magnetic properties. [13][14][15][16] The knowledge of the type of the deterioration mechanism and the degree of the deterioration of magnetic property is important for designing electrical machines in terms of magnetic field and loss calculations. 17 Therefore, two further laser surface treatment technologies were developed, whose application leads to an improvement of the electrical machines performance.…”