Three-Dimensional Plasma Arc Simulation Using Resistive MHD

2013 ◽  
pp. 31-43
Author(s):  
Rolf Jeltsch ◽  
Harish Kumar
Keyword(s):  
Three Dimensional ◽  
Plasma Arc

Numerical Simulation of the Relation between Plasma Reflection and Keyhole Dimension in the Keyhole PAW Process

2011 ◽  
Vol 399-401 ◽  
pp. 1812-1815
Author(s):  
Feng Liang Yin ◽  
Sheng Zhu ◽  
Sheng Sun Hu
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Three Dimensional ◽  
Plasma Arc ◽  
The Status ◽  
Voltage Signal ◽  
Plasma Reflection

A three-dimensional mathematical model has been established to research the relation between the plasma reflection and status of keyhole during the keyhole PAW processing. It has been found that the strength of the plasma reflection is related to the keyhole dimension. Another condition to make the plasma refection appearance is that the keyhole or concave in the pool must be unsymmetrical about the axis of the plasma arc. The mechanism of detecting circuit designed based on the fact that the plasma refection is able to indicate the status of keyhole is mathematically studied. The result shows that the voltage signal in the detecting circuit can be used to indicate the status of keyhole.

Modeling of Three-Dimensional Gas Metal Arc Welding With Groove

2007 ◽  
Author(s):  
J. Hu ◽  
H. L. Tsai
Keyword(s):  
Weld Pool ◽  
Arc Welding ◽  
Filler Metal ◽  
Gas Metal Arc Welding ◽  
Three Dimensional ◽  
Plasma Arc ◽  
Droplet Impingement ◽  
Sulfur Species ◽  
Metal Arc Welding ◽  
Arc Pressure

This article analyzes the dynamic process of groove filling and the resulting weld pool fluid flow in gas metal arc welding of thick metals with V-groove. Filler droplets carrying mass, momentum, thermal energy, and sulfur species are periodically impinged onto the workpiece. The complex transport phenomena in the weld pool, caused by the combined effect of droplet impingement, gravity, electromagnetic force, surface tension, and plasma arc pressure, were investigated to determine the transient weld pool shape and distributions of velocity, temperature, and sulfur species in the weld pool. It was found that the groove provides a channel which can smooth the flow in the weld pool, leading to poor mixing between the filler metal and the base metal, as compared to the case without a groove.

Numerical Analysis on the Temperature Field in Laser-Plasma Hybrid Welding of an Aluminum Alloy

2008 ◽  
Vol 580-582 ◽  
pp. 279-282
Author(s):  
Zhi Ning Li ◽  
Bao Hua Chang ◽  
Dong Du ◽  
Hua Zhang
Keyword(s):  
Heat Transfer ◽  
Aluminum Alloy ◽  
Laser Plasma ◽  
Three Dimensional ◽  
Temperature Fields ◽  
Transfer Model ◽  
Heat Sources ◽  
Hybrid Welding ◽  
Plasma Arc ◽  
Simulation Results

A three dimensional heat transfer model on laser-plasma hybrid welding has been proposed, that takes into account the interaction between laser beam and plasma arc. Through FEM computation, the temperature fields were computed and analyzed for an Al-Li alloy during laserplasma hybrid welding with different distances between the two heat sources. The simulation results are in agreement with the experimental results.

Analytical and numerical investigations of weld bead shape in plasma arc welding of thin Ti-6al-4v sheets

SIMULATION ◽  
2017 ◽  
Vol 93 (12) ◽  
pp. 1123-1138 ◽  
Author(s):  
V Dhinakaran ◽  
N Siva Shanmugam ◽  
K Sankaranarayanasamy ◽  
R Rahul
Keyword(s):  
Finite Element ◽  
Heat Source ◽  
Analytical Model ◽  
Arc Welding ◽  
Thermal Cycle ◽  
Three Dimensional ◽  
Transient Temperature ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Element Simulation

In this research work, a new analytical model has been developed to predict the temperature distribution during plasma arc welding of thin Ti-6Al-4V sheets. Dhinakaran’s model based on a three-dimensional parabolic Gaussian heat source is considered as a plasma arc heat source moving on a semi-infinite body to derive the analytical model and the same heat source model is substituted in the three-dimensional Fourier’s law of heat conduction and implemented in the finite element package. Thermo physical properties, such as density, specific heat, and thermal conductivity, are used as temperature-dependent properties in finite element simulation. Numerical simulation is carried out using COMSOL. The new analytical model is expressed as a function of three-dimensional spatial co-ordinates and the time co-ordinate. A computer program has been written to solve the analytical model in order to obtain the distribution of transient temperature at any point of interest. The transient temperature distribution predicted by the analytical model has been compared with both the experimental result and the numerical result. Experimental work is carried out to measure the thermal cycle during welding. The thermal cycle is measured by using an infrared thermometer. Very good correlation has been obtained between the predicted transient temperature by analytical solution and the measured temperature, as well as the finite element simulation result. This provides a reliable alternative for using these analytical solutions in the future to obtain the thermal cycle, distortion, and thermal stress during plasma arc welding.

Numerical Simulation of a Combined Plasma Arc Based on Sequentially Coupled Physics Analysis

2010 ◽  
Vol 129-131 ◽  
pp. 708-713
Author(s):  
Jian Bing Meng ◽  
Xiao Juan Dong ◽  
Wen Ji Xu
Keyword(s):  
Fluid Flow ◽  
Three Dimensional ◽  
Mapping Method ◽  
Variable Step Size ◽  
Plasma Arc ◽  
Step Size ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Flow Phenomena ◽  
Sequential Coupling

A three-dimensional axisymmetric mathematical model, including the influence of the swirl exiting in the plasma torch, was developed to describe the heat transfer and fluid flow within a combined plasma arc. In this model, a mapping method and a meshing method of variable step-size were adopted to mesh the calculation domain and to improve the computational precision. To overcome the problem issuing from a coexistence of non-transferred arc and transfer arc and a complicated interaction between electric, magnetic, heat flow and fluid flow phenomena in the combined plasma arc, a sequential coupling method and a physical environment approach were introduced into the finite element analysis on the behaviors of combined plasma arc. Furthermore, the characteristics of combined plasma arc such as temperature, velocity, current density and electromagnetic force were studied.

Modeling Three-Dimensional Plasma Arc in Gas Tungsten Arc Welding

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
G. Xu ◽  
J. Hu ◽  
H. L. Tsai
Keyword(s):  
Magnetic Field ◽  
Weld Pool ◽  
Current Density ◽  
Arc Welding ◽  
Three Dimensional ◽  
Gas Tungsten Arc Welding ◽  
Plasma Arc ◽  
Gas Tungsten Arc ◽  
Pool Model ◽  
Gas Tungsten

This article presents a three-dimensional (3D) mathematical model for the plasma arc in gas tungsten arc welding (GTAW). The velocity, pressure, temperature, electric potential, current density, and magnetic field of the plasma arc are calculated by solving the mass, momentum, and energy conservation equations coupled with electromagnetic equations. The predicted results were compared with the published experimental data and good agreements were achieved. This 3D model can be used to study a nonaxisymmetric arc that may be caused by the presence of nonaxisymmetric weld pools, joint configurations, and perturbations such as an external magnetic field. This study also provides a method to calculate 3D arc pressure, heat flux, and current density on the surface of the weld pool which, if coupled with a weld pool model, will become a complete model of GTAW.

Prediction of Heat Distribution Shape and Nozzle Diameter of Plasma Arc Cutter

2011 ◽  
Vol 284-286 ◽  
pp. 2465-2468
Author(s):  
Aniruddha Ghosh ◽  
Shailendra Bhatia ◽  
Somnath Chattopadhyaya
Keyword(s):  
Aerodynamic Drag ◽  
Three Dimensional ◽  
Distribution Model ◽  
Work Piece ◽  
Heat Distribution ◽  
Plasma Arc ◽  
Plasma Properties ◽  
Plasma Torches ◽  
Distribution Shape ◽  
Energy And Momentum

Theoretical three-dimensional Gaussian heat distribution model of the complex heat flow and plasma properties of cutting plasma torches have been developed. For cutting metallic plates, plasma torches must produce a narrow supersonic plasma jet with enough energy and momentum densities to melt, vaporize, and remove the metal from the impingement region. Our model allows us to study the details of the heat distribution and to make predictions on pick temperature development on metal surface, heat transfer to the work piece, force i.e. the forces acting on the melt (aerodynamic drag, gravity, viscosity and surface tension) during plasma arc cutting, the main forces acting on the melt is believed to be the aerodynamic drag force and the gravity is significant only for thick metal plates. With the help of these assumptions and diameter of Gaussian heat source’s volume, diameter of nozzle has been calculated for thin work piece. A good agreement is found between the model results and the available experimental data.

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