Comparison of laser and TIG welding of laminated electrical steels

An Experimental Approach for Condition Monitoring of Magnetic Cores With Grain-Oriented Electrical Steels

“…DHLs of the samples were reproduced using model (7). Based on a trial-and-error method, it was found that a constant exponent of ( ) = 0.57 is acceptable for all samples and flux densities.…”

“…Quality of the magnetic cores are determined by electrical and magnetic properties of the magnetic materials, coating of the laminations which determine the inter-laminar resistance between the laminations, clamping pressure, manufacturing processes, etc. Key amongst these are manufacturing processes which have direct impacts on properties of the materials and hence normal operation of the magnetic cores and related devices [1][2][3][4][5][6][7].…”

“…Magnetic and electric properties of the individual laminations and the assembled cores can be deteriorated by manufacturing processes, e.g. cutting, punching, stamping and welding, as a result of mechanical and thermal residual stress [7]. Additionally, punching and cutting could lead to microscopic edge burrs around the punched holes or at the cut edge, and can cause low inter-laminar resistance, electrical contact and hence inter-laminar fault (ILF) between the laminations [2], [8][9][10][11][12].…”

“…ILF detection and condition monitoring of the magnetic cores have been an active area of research and interesting topic for designers and manufacturers of the electrical steels and laminated magnetic cores. In this regards, practical methods have been introduced and successfully employed to evaluate ILF of rotating machines [4][5][6][7][8][9][10][11][12] and transformers [13][14][15][16], and other magnetic devices with laminated cores. An overall review of these methods is performed in [1].…”

Investigation on TIG welding parameters of 2205 duplex stainless steel

“…Shafee et al used the Taguchi method to improve the weld quality characteristics and reported that the ANOVA has the merit of being able to validate on a statistical basis only [19]. Many researchers have analysed the TIG welding parameters for various materials [20][21][22][23][24]. Lakshminarayanan et al have done an assessment of microstructure, hardness, tensile and impact strength of friction stir welded ferritic stainless steel joints [25].…”