scholarly journals Parametric investigation on an industrial electromagnetic continuous casting mould performance

2017 ◽  
Vol 4 (4) ◽  
pp. 256-262 ◽  
Author(s):  
Lintao Zhang ◽  
Anyuan Deng ◽  
Ian Cameron ◽  
Engang Wang ◽  
Johann Sienz
Keyword(s):  
Magnetic Field ◽  
Continuous Casting ◽  
Alternating Current ◽  
Quantitative Investigation ◽  
Current Frequency ◽  
Designed Experiment ◽  
Slit Length ◽  
Continuous Casting Mould ◽  
The Magnetic Field ◽  
Electromagnetic Continuous Casting

Abstract This research aimed at conducting a quantitative investigation of process parameters on the magnetic field contribution in an electromagnetic continuous casting mould. The Taguchi method (4 factors and 3 factor value levels: L9 orthogonal array) was adopted to design matrix of the simulation runs and the analysis of variance was used to evaluate the contributions of each control factor. The simulations were conducted based on the finite element method and the numerical set-up was validated by the designed experiment. The results showed that the applied alternating current magnitude contributed most (76.64%) to the magnetic field level in the mould, compared to the other control factors. It was followed by the slit length (17.72%), the alternating current frequency (4.17%) and the slit width (1.57%). Highlights Numerical system was validated by the designed experiment. A quantitative investigation of process parameter on the magnetic field in contribution an EMCC mould was conducted. The current value was the most influential factor, followed by the slit length, current frequency and the slit width.

scholarly journals The Simulation and Optimization of an Electromagnetic Field in a Vertical Continuous Casting Mold for a Large Bloom

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 516
Author(s):  
Lianwang Zhang ◽  
Changjun Xu ◽  
Jiazheng Zhang ◽  
Tao Wang ◽  
Jing Li ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Continuous Casting ◽  
Electromagnetic Force ◽  
Three Dimensional ◽  
Electromagnetic Stirring ◽  
Current Intensity ◽  
Continuous Casting Mold ◽  
Current Frequency ◽  
Simulation And Optimization ◽  
Electromagnetic Model

The electromagnetic model of a large-bloom continuous casting was established to simulate the magnetic field. The model 3600 digital, high-precision, three-dimensional Gaussian meter was used to measure the internal magnetic field of mold electromagnetic stirring (M-EMS). The distribution of simulated magnetic field was basically consistent with that of the measured magnetic field; the accuracy of electromagnetic stirring model was verified. With the increase of current frequency, the electromagnetic force first increases and then decreases; when the current frequency is 9 Hz, the electromagnetic force reaches its maximum value. A bipolar electromagnetic stirring model is proposed; the influence of current intensity and distance were investigated. With the increase of current intensity of lower mold electromagnetic stirring (M-EMSB), the internal magnetic intensity of upper mold electromagnetic stirring (M-EMSA) gradually increases, and the middle region is gradually filled by magnetic field. With the increase of the distance, the range of the low-intensity magnetic field expands. When the current intensity of the M-EMSB is 320 A, and the distance is 400 mm, an 8 mT uniform magnetic field in the range of 1.2 m is formed. Compared with the traditional continuous casting electromagnetic agitator, the center equiaxial crystal of bipolar electromagnetic agitator increases from 30.3% to 49.5%.

New Developments to Reduce Arc Blow during SMAW of Pipelines

2018 ◽  
Vol 938 ◽  
pp. 96-103 ◽  
Author(s):  
Sergey V. Baklanov ◽  
Anton S. Gordynets ◽  
A.S. Kiselev ◽  
Mikhail S. Slobodyan
Keyword(s):  
Magnetic Field ◽  
Direct Current ◽  
Arc Welding ◽  
Alternating Current ◽  
Shielded Metal Arc Welding ◽  
Electrode Coating ◽  
Current Electrode ◽  
Repair Work ◽  
Metal Arc Welding ◽  
The Magnetic Field

In some cases, magnetic blow does not allow using direct current for shielded metal arc welding. This is especially true for repair work on pipelines after magnetic flaw detection. Alternating current is useful to control magnetic arc blow during welding. The most promising results give technologies using alternating current with a rectangular waveform. However, the advantages of this method have not been used until now. The main goal of this study is to determine the influence of the parameters of the arc on its stability and the metal transfer mode during shielded metal arc welding under perturbing action of the magnetic field. The proposed methodology of experimental research allowed identifying the cause of arc extinction using direct current electrode positive. This is due to displacement of molten droplets of metal by the magnetic field from of the uneven melted electrode coating and its subsequent separation. This problem was solved using alternating current with the square waveform pulse mode at a frequency of 500 Hz. The amplitude-time parameters of the current pulses provide stabilization of the arc and volume of the molten electrode metal.

scholarly journals Electric Current Distribution During Electromagnetic Braking in Continuous Casting

2020 ◽  
Vol 51 (6) ◽  
pp. 2811-2828 ◽  
Author(s):  
Alexander Vakhrushev ◽  
Abdellah Kharicha ◽  
Zhongqiu Liu ◽  
Menghuai Wu ◽  
Andreas Ludwig ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Continuous Casting ◽  
Electric Current ◽  
Current Loop ◽  
Solid Shell ◽  
Electrical Boundary Conditions ◽  
Applied Technology ◽  
Transitional Behavior ◽  
The Magnetic Field ◽  
Strongly Damped

AbstractThe electromagnetic brake (EMBr) is a well-known and widely applied technology for controlling the melt flow in the continuous casting (CC) of the steel. The effect of a steady (DC) magnetic field (0.31 T) in a CC mold is numerically studied based on the GaInSn experiment. The electrical boundary conditions are varied by considering a perfectly insulating/conductive mold or the presence of a conductive solid shell, which is experimentally modeled by 0.5 mm brass plates. An intense current density (up to 350 kA/m2) is induced by the EMBr magnetic field in the form of loops. The electric current loop tends to close either inside the liquid bulk or through the conductive solid. Based on the character of the induced current loop closures, the turbulent flow is affected as follows: (i) it becomes unstable in the insulated mold, forming 2D self-inducing vortex structures aligned with the magnetic field; (ii) it is strongly damped for the conductive mold; and (iii) it exhibits transitional behavior with the presence of a solid shell. The application of the obtained results for the real CC process is discussed and validated.

scholarly journals Magnetic field asymmetry at external phases of shielded single-pole three-phase flat high-current busduct

2019 ◽  
Vol 28 ◽  
pp. 01007
Author(s):  
Dariusz Kusiak ◽  
Tomasz Szczegielniak ◽  
Zygmunt Piątek
Keyword(s):  
Magnetic Field ◽  
Field Distribution ◽  
Proximity Effect ◽  
Eddy Currents ◽  
Skin Effect ◽  
High Current ◽  
Current Frequency ◽  
Three Phase ◽  
The Magnetic Field ◽  
Outer Area

The article shows the total magnetic field distribution in two outer conductors of the flat, three-phase single-pole shielded, high-current busduct is asymmetric. The phase currents in the shielded conductors decide about the magnetic field of such a high-current busduct. The components of this field reflect the magnetic field of the reverse reaction fields of the eddy currents induced in the conductors of the adjacent phases as the results of the proximity effect and the skin effect. The field distribution is shown in the outer area of the outer phases as the function of the parameters reflecting the current frequency, the conductivity, and the transverse dimensions of the tubular conductors.

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