Design of Laser Welding Parameters for Joining Ti Grade 2 and AW 5754 Aluminium Alloys Using Numerical Simulation

Behúlová, Mária; Babalová, Eva; Sahul, Miroslav

doi:10.1155/2017/3451289

Cited by 11 publications

(5 citation statements)

References 41 publications

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“…Tetragonal mesh is used with a minimum mesh size of r /8 mm having a total number of mesh elements of 750,639 elements. The temperature-dependent material properties of AA-5754 and AA-6005 alloys are taken from [23,24] and COMSOL material library [25]. These properties are defined locally using a piecewise function and in case of unavailability of material properties beyond a certain temperature, the values are taken as constant for the last known temperature.…”

Section: Model Descriptionmentioning

confidence: 99%

Numerical study of beam oscillation and its effect on the solidification parameters and grain morphology in remote laser welding of high-strength aluminium alloys

Mohan

Ceglarek

Franciosa

et al. 2023

Science and Technology of Welding and Joining

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This study investigated the effect of beam oscillation on the solidification behaviour during laser welding of Al-5754 to Al-6061 alloy. In this study, a finite element model has been developed to simulate temperature and fluid flow fields by implementing different combinations of volumetric heat source models. Solidification parameters such as temperature gradient (G), solidification rate (R), cooling rate (G × R) and G/R are evaluated to understand the mechanism of microstructure formation. It was found that beam oscillation improves the tensile strength by 21.4% for full penetration welding due to an increase in the percentage of formation of equiaxed grains. Modelling results revealed that the cooling rate increases with an increase in oscillation frequency. However, tensile strength followed a parabolic distribution with a peak at the oscillation frequency of 300 Hz.

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Section: Model Descriptionmentioning

confidence: 99%

Numerical study of beam oscillation and its effect on the solidification parameters and grain morphology in remote laser welding of high-strength aluminium alloys

Mohan

Ceglarek

Franciosa

et al. 2023

Science and Technology of Welding and Joining

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“…The application of numerical simulations to welding processes offers numerous advantages for studying and explaining the physical principles of complex phenomena related to joining processes [ 58 , 59 , 60 , 61 , 62 ]. The results of numerical simulations can be used for a time-saving and cost-effective assessment of the impact of welding parameters on the quality of Al/Ti dissimilar weld joints, and the setting of optimal parameters of the welding process [ 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 ].…”

Section: Introductionmentioning

confidence: 99%

“…A 3D Gaussian ellipsoidal volumetric heat source model was used for numerical simulation of temperature fields in laser beam welding of Al/Ti sheets of different thicknesses [ 66 ]. To analyze the formation of welded–brazed Al/Ti butt joints using a filler wire, a simulation model, incorporating the 3D conical heat source model, was suggested [ 67 , 68 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Temperature Fields during Laser Welding–Brazing of Al/Ti Plates

Behúlová

Babalová

2023

Materials

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The formation of dissimilar weld joints, including Al/Ti joints, is an area of research supported by the need for weight reduction and corrosion resistance in automotive, aircraft, aeronautic, and other industries. Depending on the cooling rates and chemical composition, rapid solidification of Al/Ti alloys during laser welding can lead to the development of different metastable phases and the formation of brittle intermetallic compounds (IMCs). The effort to successfully join aluminum to titanium alloys is associated with demands to minimize the thickness of brittle IMC zones by selecting appropriate welding parameters or applying suitable filler materials. The paper is focused on the numerical simulation of the laser welding–brazing of 2.0 mm thick titanium Grade 2 and EN AW5083 aluminum alloy plates using 5087 aluminum filler wire. The developed simulation model was used to study the impact of laser welding–brazing parameters (laser power, welding speed, and laser beam offset) on the transient temperature fields and weld-pool characteristics. The results of numerical simulations were compared with temperatures measured during the laser welding–brazing of Al/Ti plates using a TruDisk 4002 disk laser, and macrostructural and microstructural analyses, and weld tensile strength measurements, were conducted. The ultimate tensile strength (UTS) of welded–brazed joints increases with an increase in the laser beam offset to the Al side and with an increase in welding speed. The highest UTS values at the level of 220 MPa and 245 MPa were measured for joints produced at a laser power of 1.8 kW along with a welding speed of 30 mm·s−1 and a laser beam offset of 300 μm and 460 μm, respectively. When increasing the laser power to 2 kW, the UTS decreased. The results exhibited that the tensile strength of Al/Ti welded–brazed joints was dependent, regardless of the welding parameters, on the amount of melted Ti Grade 2, which, during rapid solidification, determines the thickness and morphology of the IMC layer. A simple formula was proposed to predict the tensile strength of welded–brazed joints using the computed cross-sectional Ti weld metal area.

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“…The thickness of the IMC layer depends on the temperature profile generated by the heat source exploited for welding and the heat flux distribution across the interface. However, the thermal fields are also responsible for geometry of the fusion zone and thus the dimension of the bonding area [2]. Laser beam welding (LBW) is widely used manufacturing process for welding of similar and dissimilar materials.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Welding Parameters on Bead Geometry in Nd: Yag Laser Welding of Titanium With Ti-6al-7nb Using Response Surface (Rsm)

2020

jcr

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Pulsed laser welding is a powerful technique especially suitable for joining thin sheet metals. In this study, based on experimental data, pulsed laser welding of thin Cp-Ti and Ti-6Al-7Nb sheets has been optimized. The experimental data required for modeling are gathered as per Central Composite Design matrix in Response Surface Methodology (RSM) with full replication of 30 runs. Response Surface Methodology is used to investigate the effect of four input variables, namely: type of workpiece (WP), pulse energy (PE), pulse duration (Ton), welding speed (WS) and on the depth of penetration and bead width in YAG laser welding process.To study the proposed second-order polynomial model for DOP and BW, a Central Composite Design is used for estimating the model coefficients of the four input factors on DOP and BW. Experiments were conducted on Cp-Ti alloy with Ti-6Al-7Nb alloy. The significant coefficients are obtained by performing an Analysis of Variance at the 5 % level of significance. The results revealed that DOP and BW are more influenced by type of workpiece, pulse energy, pulse duration, welding speed and few of their interactions. A mathematical regression model was developed to predict both of DOP and BW in YAG laser welding. Also, the developed model could be used for the selection of the levels in this process for saving in welding time.

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Design of Laser Welding Parameters for Joining Ti Grade 2 and AW 5754 Aluminium Alloys Using Numerical Simulation

Cited by 11 publications

References 41 publications

Numerical study of beam oscillation and its effect on the solidification parameters and grain morphology in remote laser welding of high-strength aluminium alloys

Numerical study of beam oscillation and its effect on the solidification parameters and grain morphology in remote laser welding of high-strength aluminium alloys

Numerical Simulation of Temperature Fields during Laser Welding–Brazing of Al/Ti Plates

Modelling of Welding Parameters on Bead Geometry in Nd: Yag Laser Welding of Titanium With Ti-6al-7nb Using Response Surface (Rsm)

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