On determining the shape of weld pools

1987 ◽  
pp. 261-275
Author(s):  
R. E. Craine
Keyword(s):  
Weld Pools

scholarly journals In situobservations and measurements during solidification of CuNi weld pools

2016 ◽  
Vol 21 (7) ◽  
pp. 578-584 ◽  
Author(s):  
A. Chiocca ◽  
F. Soulié ◽  
F. Deschaux-Beaume ◽  
C. Bordreuil
Keyword(s):  
Weld Pools

Effect of Intermetallic Compounds Content on Laser Welding Performance of Al-Fe Alloy Sheets

2014 ◽  
Vol 794-796 ◽  
pp. 401-406 ◽  
Author(s):  
Pi Zhi Zhao ◽  
Yan Feng Pan ◽  
Jiang Tao ◽  
Xiang Jun Shi ◽  
Qi Zhang
Keyword(s):  
Thermal Conductivity ◽  
Laser Welding ◽  
Intermetallic Compounds ◽  
Nonuniform Distribution ◽  
Welding Parameters ◽  
Lower Content ◽  
Absorbed Energy ◽  
Size Uniformity ◽  
Distribution Uniformity ◽  
Weld Pools

The present study investigated the laser welding performance of Al-Fe aluminum alloy sheets with different contents of intermetallic compounds. Under the same welding parameters, the alloy of higher intermetallic compounds content has wide and deep weld pools with uniform sizes. The alloy of lower intermetallic compounds content has narrow and shallow weld pools with nonuniform sizes. The higher content of intermetallic compounds results in higher laser absorptivity and lower thermal conductivity, and then increases the effective absorbed energy during welding, which is beneficial to the formation of wide and deep weld pools. The distribution uniformity of intermetallic compounds influences the size uniformity of weld pools. In the alloy with lower content of intermetallic compounds, the nonuniform distribution of intermeallic compounds results in the formation of abnormal weld pool, leading to the nonuniform size of the weld pools. In the alloy with higher content of intermetallic compounds, uniform distribution of intermetallic compounds make the size of weld pools more uniform.

Increasing the effective affect of the magnetic field on the weld pool

2021 ◽  
pp. 29-33
Author(s):  
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Magnetic Fields ◽  
Weld Pool ◽  
Electromagnetic Effects ◽  
Weld Pools ◽  
The Magnetic Field

Variants of weld pools obtained by verification with the influence of magnetic fields are considered. Methods for increasing the effectiveness of electromagnetic effects during welding are proposed. Keywords: welding, electromagnetic field, weld pool, induction, coating. [email protected], [email protected]

Nonaxisymmetric Convection in Stationary Gas Tungsten Arc Weld Pools

1997 ◽  
Vol 119 (1) ◽  
pp. 164-172 ◽  
Author(s):  
Y. Joshi ◽  
P. Dutta ◽  
P. E. Schupp ◽  
D. Espinosa
Keyword(s):  
Computational Study ◽  
Numerical Models ◽  
Three Dimensional ◽  
Pulsed Laser ◽  
Surface Flow ◽  
Rotational Flow ◽  
Visualization System ◽  
Gas Tungsten Arc ◽  
Laser Visualization ◽  
Weld Pools

Observations of surface flow patterns of steel and aluminum GTAW pools have been made using a pulsed laser visualization system. The weld pool convection is found to be three-dimensional, with the azimuthal circulation depending on the location of the clamp with respect to the torch. Oscillation of steel pools and undulating motion in aluminum weld pools are also observed even with steady process parameters. Current axisymmetric numerical models are unable to explain such phenomena. A three-dimensional computational study is carried out in this study to explain the rotational flow in aluminum weld pools.

Computer simulation of convection in moving arc weld pools

1986 ◽  
Vol 17 (12) ◽  
pp. 2271-2277 ◽  
Author(s):  
S. Kou ◽  
Y. H. Wang
Keyword(s):  
Computer Simulation ◽  
Weld Pools

scholarly journals Fluid Flow Characteristics and Weld Formation Quality in Gas Tungsten Arc Welding of a Thick-Sheet Aluminum Alloy Structure by Varying Welding Position

2018 ◽  
Vol 8 (8) ◽  
pp. 1215 ◽  
Author(s):  
Baohua Chang ◽  
Hong Xiao ◽  
Jinle Zeng ◽  
Shuo Yang ◽  
Dong Du ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Molten Metal ◽  
Weld Pool ◽  
Flow Characteristics ◽  
Sheet Thickness ◽  
Thick Sheet ◽  
Weld Formation ◽  
Sheet Aluminum ◽  
Weld Pools ◽  
Welding Position

This study aims to reveal the cause of different weld formation quality for varying welding position in the GTAW (Gas Tungsten Arc Welding) of a thick-sheet aluminum alloy structure. The fluid flow characteristics of weld pools are investigated by CFD (Computational Fluid Dynamic) modeling and high-speed imaging for the climbing and flat welding positions, which correspond to the start and finish ends of the welds of the structure, respectively. Results show that the directions of gravity relative to weld pools may notably affect the fluid flows in weld pools for different welding positions. For flat welding, gravity will accelerate the fluid flow in the direction of sheet thickness only and in turn result in a high velocity downwards, which implies a good penetrating capability. Welds of good formation with smooth surface and consistent width can be produced under flat welding position. In contrast, for climbing welding, gravity will act on the molten metal in both the direction of sheet thickness and the lateral direction of the weld pool. As a result, the velocity in sheet-thickness direction is decreased, which implies a decreased penetrating capability. Meanwhile, the velocity backwards is increased in the top portion of the weld pool, which makes the molten metal apt to flow out of the weld pool. Both the decreased penetrating capability and the accelerated molten metal outflow would render the climbing welding process unstable, and result in welds of poor formation with uneven weld surface and inconsistent weld width. Based on the study, possible methods are proposed that could be used to improve the weld formation quality when welding thick-sheet aluminum alloys structures using various welding positions.

Numerical Analysis of Fully Penetrated Weld Pools in Gas Tungsten Arc Welding

1996 ◽  
Vol 210 (2) ◽  
pp. 187-195 ◽  
Author(s):  
Y M Zhang ◽  
Z N Cao ◽  
R Kovacevic
Keyword(s):  
Free Surface ◽  
Weld Pool ◽  
Driving Forces ◽  
Numerical Models ◽  
Surface Tension Gradient ◽  
Bottom Surface ◽  
Welding Parameters ◽  
Back Side ◽  
Full Penetration ◽  
Weld Pools

Full penetration welding is widely used in metal joining, but it has been ignored in previous convective numerical models. In addition to the free surface on top of the pool, an additional free surface appears on the bottom of the workpiece. It can be shown that the top surface, temperature distribution and fluid flow field in the weld pool are all coupled with the pool's bottom surface. This complicates the numerical process and therefore no convective models have previously been developed for fully penetrated weld pools. In order to improve the numerical solution for the fully penetrated weld pool, a three-dimensional model is proposed. Free top and bottom pool surfaces have been included. The electromagnetic force, buoyancy force and surface tension gradient (Marangoni) are the three driving forces for weld pool convection. Welding parameters are changed in order to analyse their effects on weld pool geometry. It is found that the depression of the top surface contains abundant information about the full penetration state as specified by the back-side bead width.

Heat- and fluid-flow phenomena in weld pools

1984 ◽  
Vol 147 (-1) ◽  
pp. 53 ◽  
Author(s):  
G. M. Oreper ◽  
J. Szekely
Keyword(s):  
Fluid Flow ◽  
Flow Phenomena ◽  
Weld Pools ◽  
Heat And Fluid Flow

Sensing and fuzzy logic control of weld pools in pulsed MIG welding

1993 ◽  
Vol 7 (5) ◽  
pp. 378-383 ◽  
Author(s):  
S Yamane ◽  
K Ohshima ◽  
Y Kohashi
Keyword(s):  
Fuzzy Logic ◽  
Fuzzy Logic Control ◽  
Mig Welding ◽  
Logic Control ◽  
Weld Pools
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