Three Dimensional Analysis of High Frequency Induction Welding of Steel Pipes With Impeder

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Hyun-Jung Kim ◽  
Sung-Kie Youn
Keyword(s):  
Temperature Distribution ◽  
High Frequency ◽  
Three Dimensional ◽  
Proximity Effects ◽  
Small Scale ◽  
Element Analysis ◽  
Steel Pipes ◽  
High Processing Speed ◽  
High Frequency Induction

High frequency induction welding is widely employed for longitudinal seam welding of small scale tubes and pipes due to its relatively high processing speed and efficiency. This research is aimed at understanding the variables that affect the quality of the high frequency induction welding. The welding variables include the welding frequency, weld speed, vee angle, and tube thickness. Temperature distribution of the tube is calculated through three dimensional coupled electromagnetic and thermal finite element analysis. The skin and proximity effects are considered in the electromagnetic analysis. The influence of the impeder is also analyzed. The effects of the operating welding variables on the temperature distribution are investigated quantitatively by exhibiting the heat affected zone. The results explain the mechanism of significant enhancement of welding efficiency when the impeder is used. Not only good weld state can be obtained but also overheated edge can be avoided by understating the effect of welding variables. Suggestions are made for the better induction welding conditions.

Numerical investigation of the temperature field of a metal plate during high-frequency induction heat forming

2008 ◽  
Vol 223 (4) ◽  
pp. 979-986 ◽  
Author(s):  
F Liu ◽  
Y Shi ◽  
X Lei
Keyword(s):  
Temperature Field ◽  
Temperature Distribution ◽  
High Frequency ◽  
Three Dimensional ◽  
Metal Plate ◽  
Dimensionless Temperature ◽  
Induction Heat ◽  
External Forces ◽  
Different Thickness ◽  
High Frequency Induction

High-frequency induction heat forming is a flexible metal plate forming technique using non-uniform thermal stress to shape a metal plate without tools and external forces. To accurately control the deformation of a metal plate, the study of temperature field is critical. In this article, a three-dimensional finite simulation has been carried out accounting for temperature-dependent thermal properties, and the numerical simulation results are experimentally validated. The effects of the process parameters on the temperature distribution are analysed. Through defining a dimensionless temperature T* and a special Y-coordinate Y*, similarity of temperature field with the different thickness is studied. The numerical results show that the temperature distributions in the Y′ direction are similar in the different thickness, which is helpful for the establishment of an analytical model of temperature distribution and analysis of the strain field of the different thickness in the next work.

scholarly journals Analysis of the proximity and skin effects on copper loss in a stator core

2014 ◽  
Vol 63 (2) ◽  
pp. 211-225 ◽  
Author(s):  
Adrian Młot ◽  
Mariusz Korkosz ◽  
Piotr Grodzki ◽  
Marian Łukaniszyn
Keyword(s):  
High Frequency ◽  
Three Dimensional ◽  
Proximity Effects ◽  
Design Stage ◽  
Time Varying ◽  
Stator Core ◽  
Element Analysis ◽  
Simplified Approach ◽  
Copper Loss ◽  
Copper Losses

Abstract Accurate prediction of power loss distribution within an electrical device is highly desirable as it allows thermal behavior to be evaluated at the early design stage. Three-dimensional (3-D) and two-dimensional (2-D) finite element analysis (FEA) is applied to calculate dc and ac copper losses in the armature winding at high-frequency sinusoidal currents. The main goal of this paper is showing the end-winding effect on copper losses. Copper losses at high frequency are dominated by the skin and proximity effects. A time-varying current has a tendency to concentrate near the surfaces of conductors, and if the frequency is very high, the current is restricted to a very thin layer near the conductor surface. This phenomenon of nonuniform distribution of time-varying currents in conductors is known as the skin effect. The term proximity effect refers to the influence of alternating current in one conductor on the current distribution in another, nearby conductor. To evaluate the ac copper loss within the analyzed machine a simplified approach is adopted using one segment of stator core. To demonstrate an enhanced copper loss due to ac operation, the dc and ac resistances are calculated. The resistances ratio ac to dc is strongly dependent on frequency, temperature, shape of slot and size of slot opening.

Towards Predicting Relative Belt Edge Endurance With the Finite Element Method

1990 ◽  
Vol 18 (4) ◽  
pp. 216-235 ◽  
Author(s):  
J. De Eskinazi ◽  
K. Ishihara ◽  
H. Volk ◽  
T. C. Warholic
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
The Finite Element Method ◽  
Shear Deformations ◽  
Element Analysis ◽  
Vertical Loading ◽  
Predicted Values ◽  
Element Method

Abstract The paper describes the intention of the authors to determine whether it is possible to predict relative belt edge endurance for radial passenger car tires using the finite element method. Three groups of tires with different belt edge configurations were tested on a fleet test in an attempt to validate predictions from the finite element results. A two-dimensional, axisymmetric finite element analysis was first used to determine if the results from such an analysis, with emphasis on the shear deformations between the belts, could be used to predict a relative ranking for belt edge endurance. It is shown that such an analysis can lead to erroneous conclusions. A three-dimensional analysis in which tires are modeled under free rotation and static vertical loading was performed next. This approach resulted in an improvement in the quality of the correlations. The differences in the predicted values of various stress analysis parameters for the three belt edge configurations are studied and their implication on predicting belt edge endurance is discussed.

A High Temperature, Fast Switching SiC Multi-chip Power Module (MCPM) for High Frequency (> 500 kHz) Power Conversion Applications

2013 ◽  
Vol 2013 (HITEN) ◽  
pp. 000056-000060 ◽  
Author(s):  
Z. Cole ◽  
B. S. Passmore ◽  
B. Whitaker ◽  
A. Barkley ◽  
T. McNutt ◽  
...  
Keyword(s):  
High Temperature ◽  
High Frequency ◽  
Power Conversion ◽  
Three Dimensional ◽  
Boost Converter ◽  
Switching Frequency ◽  
Power Module ◽  
Element Analysis ◽  
Switching Characteristics ◽  
Three Dimensional Finite Element

In high frequency power conversion applications, the dominant mechanism attributed to power loss is the turn-on and -off transition times. To this end, a full-bridge silicon carbide (SiC) multi-chip power module (MCPM) was designed to minimize parasitics in order to reduce over-voltage/current spikes as well as resistance in the power path. The MCPM was designed and packaged using high temperature (> 200 °C) materials and processes. Using these advanced packaging materials and devices, the SiC MCPM was designed to exhibit low thermal resistance which was modeled using three-dimensional finite-element analysis and experimentally verified to be 0.18 °C/W. A good agreement between the model and experiment was achieved. MCPMs were assembled and the gate leakage, drain leakage, on-state characteristics, and on-resistance were measured over temperature. To verify low parasitic design, the SiC MCPM was inserted into a boost converter configuration and the switching characteristics were investigated. Extremely low rise and fall times of 16.1 and 7.5 ns were observed, respectively. The boost converter demonstrated an efficiency of > 98.6% at 4.8 kW operating at a switching frequency of 250 kHz. In addition, a peak efficiency of 96.5% was achieved for a switching frequency of 1.2 MHz and output power of 3 kW.

scholarly journals Simulation study on modified coil configuration used for shrink fitting of semi-built-up crankshaft and parameters influencing the thermal distribution

2020 ◽  
Vol 103 (4) ◽  
pp. 003685042096785
Author(s):  
Jianguo Duan ◽  
Qinglei Zhang ◽  
Xintao Long ◽  
Kebin Zhang
Keyword(s):  
Temperature Distribution ◽  
Induction Heating ◽  
Three Dimensional ◽  
Element Model ◽  
Heating Process ◽  
Current Frequency ◽  
Dimensional Finite Element ◽  
Shrink Fitting ◽  
Three Dimensional Finite Element

Semi-built-up crankshafts are universally manufactured by shrink-fitting process with induction heating device. The configurations of induction coil have a great impact on the distributions of eddy current and temperature of crankthrows. Most induction devices are apt to cause some undesirable phenomena such as uneven temperature distribution and irregular deformation after induction heating. This article proposes a modified configuration of induction heating coil according to the crankthrow geometry. By combining the heat conduction equation and the heat boundary conditions, a three-dimensional finite element model, which takes into account the nonlinearity of the material’s electromagnetic and thermal physical properties in the heating process, was developed. The influence of several parameters, such as position and curvature of the arc coil, the current frequency and density, coaxiality of crankweb hole and coil, influencing the temperature distribution inside the crankthrow was also analyzed. The comparison with the numerical simulation results of the original configuration indicates that the modified configuration has better adaptability to the crankthrow. Also, it can help to improve the temperature distribution, and reduce the deformation of the shrink-fitting hole. This exploration provide an effective way for the enterprise to further enhance the shrink-fitting quality of crankshaft.

Features of induction heating during hardening of tools from high-speed steel

2020 ◽  
pp. 72-75
Author(s):  
A.M. Adaskin
Keyword(s):  
High Frequency ◽  
High Speed ◽  
High Speed Steel ◽  
Salt Bath ◽  
Complete Dissolution ◽  
Carbide Matrix ◽  
Kinetics Of ◽  
Frequency Current ◽  
High Frequency Induction

The fundamental differences in the kinetics of transformations of high-speed steels during heating by high-frequency induction currents (HFC) and in salt baths are considered. At HFC, the high temperature at the "carbide — matrix" boundaries promotes more complete dissolution of carbides in austenite, which improves the quality of the tool. Keywords: high frequency current, salt bath, hardening, high speed steel, interphase boundary. [email protected]

Measurement of Residual Stresses in a Type 316H Stainless Steel Offset Repair in a Pipe Girth Weld

2005 ◽  
Vol 128 (3) ◽  
pp. 420-426 ◽  
Author(s):  
S. Hossain ◽  
C. E. Truman ◽  
D. J. Smith ◽  
P. J. Bouchard
Keyword(s):  
Stainless Steel ◽  
Residual Stresses ◽  
Pipe Wall ◽  
Three Dimensional ◽  
Hole Drilling ◽  
Element Analysis ◽  
Steel Pipes ◽  
Stress Components ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

This paper presents measurements of the in-plane residual stress components through the wall of a 218mm long, 26mm deep repair weld, offset by 7mm from the centerline of a girth weld joining two type 316H stainless steel pipes approximately 37mm thick. The measurements were obtained using the deep hole drilling technique. Two locations were examined: (i) mid-length of the repair weld and (ii) the stop-end of the repair. Both measurements were taken along the girth weld centerline. The distributions and magnitudes of the measured longitudinal and transverse stress components at the two locations were very similar over the outer half of the pipe wall. Over the inner half of the pipe wall both components of stress were found to be significantly more compressive at the stop-end of the repair than at mid-length. In general, the transverse residual stresses were found to be lower than the longitudinal residual stresses at both locations. The measured stress profiles are compared with predicted residual stresses from a three-dimensional finite element analysis.

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