NUMERICAL SIMULATION OF AZ31B MAGNESIUM ALLOY LASER-TIG HYBRID WELDING WITH NEW HEAT SOURCE MODEL

2006 ◽  
Vol 42 (02) ◽  
pp. 82 ◽  
Author(s):  
Liming LIU
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Heat Source ◽  
Source Model ◽  
Hybrid Welding ◽  
Heat Source Model ◽  
Az31b Magnesium Alloy

The New Heat Source Model of AZ31B Magnesium Alloy Laser-TIG Hybrid Welding

2019 ◽  
Vol 815 ◽  
pp. 120-124 ◽  
Author(s):  
Zhong Lin Hou ◽  
Tan Zhao ◽  
Zhen Xu ◽  
Long Hao Zhu ◽  
Jian Hua Sun ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Heat Source ◽  
Weld Pool ◽  
Inflection Point ◽  
Source Model ◽  
Hybrid Welding ◽  
Single Source ◽  
Heat Source Model ◽  
Keyhole Effect ◽  
Body Heat

A new heat source model consisted of inverted conical heat source and rotary Gauss body heat source is established using the CAE software for the keyhole effect of laser-TIG hybrid welding. The inverted conical heat source is used for analyzing the wide upper part of weld pool due to the rapid heat up by the laser and arc. The rotary Gauss body heat source model is used for analyzing the long and narrow lower part of weld pool formed by the laser. The result showed that, compared with other single source mode, this new heat source model may get a better simulation of the weld pool morphology, especially the inflection point near the keyhole. It provides a new method to predict the morphology and size of the weld pool of magnesium alloy laser-TIG welding.

Gas Tungsten Arc Welding and Hybrid Laser-TIG Welding Temperature Field Analysis of AZ31B Magnesium Alloy

2008 ◽  
Vol 575-578 ◽  
pp. 837-842 ◽  
Author(s):  
Guo Li Liang ◽  
Shao Qiang Yuan ◽  
Guang Tao Zhou ◽  
Xiao Dong Sun ◽  
Yu Mang
Keyword(s):  
Temperature Field ◽  
Magnesium Alloy ◽  
Heat Source ◽  
Arc Welding ◽  
Source Model ◽  
Tig Welding ◽  
Hybrid Welding ◽  
Heat Source Model ◽  
Welding Temperature ◽  
Gas Tungsten Arc

In this particular work, the moving Gauss heat source model based on the gas tungsten arc welding and a new heat source model based on the laser-TIG hybrid welding were developed by the finite element analysis according to the physical characteristic of the TIG welding and the laser-TIG hybrid welding, Taking into account the advice of parameter modification, the modeling was respectively carried out by the single TIG and the laser-TIG hybrid welding for AZ31B magnesium alloy. The welding temperature field and the weld cross-section geometry were simulated separately with regard to dependence on the single TIG and the laser-TIG hybrid welding. Comparing the experimentally measured value with simulated value of the weld section geometry, the simulated and the experimentally determined weld section geometry by the single TIG welding and the hybrid welding showed a good agreement, at the same time, the microstructures of the joint were also discussed respectively.

Numerical and Experimental Studies of Residual Stresses in Multipass Welding of High Strength Shipbuilding Steel

2015 ◽  
Vol 59 (03) ◽  
pp. 133-144
Author(s):  
Guangming Fu ◽  
Tetyana Gurova ◽  
Marcelo I. Lourenco ◽  
Segen F. Estefen
Keyword(s):  
Neural Network ◽  
Numerical Simulation ◽  
Heat Source ◽  
Residual Stresses ◽  
Experimental Studies ◽  
Source Model ◽  
Fe Model ◽  
Offshore Platforms ◽  
Heat Source Model ◽  
Shipbuilding Industry

The article contributes, through numerical simulation based on models calibrated by experimental results, to better estimate residual stresses and distortions in welded structures representatives of ships and offshore platforms considering welding procedures relevant to shipyard current practices. A multi-pass welding is carried out to investigate the residual stresses in laboratory tests. The temperature at several positions on a plate sample is recorded with thermocouples and residual stresses are measured using an x-ray diffraction technique. Finite element (FE) models are developed in this study and experimentally validated. The three dimensional (3D) moving Goldak's double-ellipsoidal heat source model is employed in the simulations. A Levenberg-Marquardt neural network algorithm is employed to determine the geometric parameters of the heat source model. The technique based on neural network is applied to dimension the heat source later employed in the thermal analysis using 2D FE model to reduce the computer time of the numerical simulation and to make it feasible for shipbuilding industry applications. The numerical results of temperature and residual stress distribution are correlated with the experimental measurements. Finally, the effects of preheat and interpass temperatures on the residual stresses are investigated using numerical simulation. The effects of the transient releasing temperature on the residual stresses are also discussed.

scholarly journals Numerical Analysis of the Influence of Electrode Inclination on Temperature Distribution during GMAW Overlaying

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Jerzy Winczek ◽  
Marek Gucwa ◽  
Miloš Mičian ◽  
Krzysztof Makles
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Theoretical Model ◽  
Temperature Distribution ◽  
Numerical Analysis ◽  
Heat Source ◽  
Analytical Description ◽  
Source Model ◽  
Heat Source Model ◽  
Inclination Angles

In the work, an analysis of the influence of electrode inclination on the distribution of temperature in the weld overlaying has been conducted. In the analytical description of the temperature field, a volumetric heat source model with an inclined axis with respect to the direction of surfacing was adopted. In the numerical simulation, the own theoretical model of heat source, algorithm, and program performed in the Borland Delphi environment were used. In the calculation examples, different electrode inclination angles were adopted in relation to the welded plate, in the direction of surfacing, opposite to the direction of welding, and perpendicular to the weld bead.

Numerical simulation of keyhole behaviors and droplet transfer in laser-MIG hybrid welding of Invar alloy

2018 ◽  
Vol 28 (9) ◽  
pp. 1974-1993 ◽  
Author(s):  
Dan Zhang ◽  
Yanhong Wei ◽  
Xiaohong Zhan ◽  
Jie Chen ◽  
Hao Li ◽  
...  
Keyword(s):  
Heat Source ◽  
Three Dimensional ◽  
Welding Process ◽  
Source Model ◽  
Experimental Results ◽  
Invar Alloy ◽  
Hybrid Welding ◽  
Droplet Transfer ◽  
Heat Source Model ◽  
Content Type

Purpose This paper aims to describe a three-dimensional mathematical and numerical model based on finite volume method to simulate the fluid dynamics in weld pool, droplet transfer and keyhole behaviors in the laser-MIG hybrid welding process of Fe36Ni Invar alloy. Design/methodology/approach Double-ellipsoidal heat source model and adaptive Gauss rotary body heat source model were used to describe electric arc and laser beam heat source, respectively. Besides, recoil pressure, electromagnetic force, Marangoni force, buoyancy as well as liquid material flow through a porous medium and the heat, mass, momentum transfer because of droplets were taken into consideration in the computational model. Findings The results of computer simulation, including temperature field in welded plate and velocity field in the fusion zone were presented in this article on the basis of the solution of mass, momentum and energy conservation equations. The correctness of elaborated models was validated by experimental results and this proposed model exhibited close correspondence with the experimental results with respect to weld geometry. Originality/value It lays foundation for understanding the physical phenomena accompanying hybrid welding and optimizing the process parameters for laser-MIG hybrid welding of Invar alloy.

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