LB-VPPA Hybrid Welding Heat Source Model for Aluminum Alloy

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.

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

Journal of Mechanical Engineering ◽

10.3901/jme.2006.02.082 ◽

2006 ◽

Vol 42 (02) ◽

pp. 82 ◽

Cited By ~ 5

Author(s):

Liming LIU

Keyword(s):

Numerical Simulation ◽

Magnesium Alloy ◽

Heat Source ◽

Source Model ◽

Hybrid Welding ◽

Heat Source Model ◽

Az31b Magnesium Alloy

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

International Journal of Numerical Methods for Heat &amp Fluid Flow ◽

10.1108/hff-07-2017-0266 ◽

2018 ◽

Vol 28 (9) ◽

pp. 1974-1993 ◽

Cited By ~ 1

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.575-578.837 ◽

2008 ◽

Vol 575-578 ◽

pp. 837-842 ◽

Cited By ~ 1

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.

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Verification of the welding heat source models in arc welding and hybrid plasma-MAG welding processes based on temperature field tests

Welding Technology Review ◽

10.26628/wtr.v92i5.1117 ◽

2020 ◽

Vol 92 (5) ◽

pp. 25-35

Author(s):

Damian Rochalski ◽

Dariusz Golański ◽

Jacek Szulc

Keyword(s):

Temperature Field ◽

Heat Source ◽

Source Model ◽

Temperature Measurements ◽

Mag Welding ◽

Homogeneous Distribution ◽

Hybrid Welding ◽

Heat Source Model ◽

Hybrid Plasma ◽

Welding Processes

Hybrid welding processes belong to a new group of welding varieties that most often combine two classic welding methods, such as laser welding with MIG/MAG welding or plasma welding with MAG welding. Modeling of welding stresses in this type of welding requires the definition of a new type of heat source model that combines a concentrated stream of energy with a classic heat source, which occurs in an electric arc. The paper presents the results of temperature field modeling in conventional MAG welding and hybrid plasma-MAG welding. In the first case, the heat source model described by Goldak was used, and in the second case, the Goldak model was combined with the developed rectangular heat source model with a homogeneous distribution. The temperature distributions obtained from the simulations were verified by spot temperature measurements during welding with thermocouples. A fairly good agreement of the numerical analysis results with the temperature measurements for MAG welding was obtained, while in the case of hybrid welding the discrepancies between the modeling and temperature measurements were greater. The results were discussed, indicating potential causes and factors influencing the obtained test results.

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