Solidification cracking susceptibility in pulsed laser welding of Al–Mg alloys

Beiranvand, Zeinab Malekshahi; Ghaini, F. Malek; Moosavy, Homam Naffakh; Sheikhi, Mohsen; Torkamany, M.J.

doi:10.1016/j.mtla.2019.100417

Cited by 17 publications

(11 citation statements)

References 12 publications

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“…Equation (2) illustrates the distribution mode of laser beam power, which is considered to be Gaussian. In this equation, (x 0 , y 0 ) is the initial point of the laser beam focused on the substrate, which is equal to (5,0). Moreover, it should be noted that a pulsed Nd:YAG laser was utilized in the present study; therefore, it has a pulse duration and frequency with which the on-time and off-time of the laser beam can be determined.…”

Section: Thermal Modelingmentioning

confidence: 99%

“…Both of the temperature gradient (G) and the growth rate (R) are of paramount importance for determining the microstructure of solidified welds. The analytical Rosenthal equation can be utilized to estimate these imperative parameters abruptly via derivation from Equation (5). The temperature gradients in the directions of the axis y-and the axis z-are computed using the following equations.…”

Section: Predicted Temperature-dependent Parametersmentioning

confidence: 99%

“…Primary dendrite arm spacing (PDAS) can be an appropriate microstructural instance with which the mechanical features of welded materials can be elaborated upon [9]. As a result, the correlation between the solidification process and primary dendrite arm spacing has become the attention of various researches [5,33,34]. The Kurz and Fisher (KF) model is one of the most traditional models with which the calculation of PDAS becomes available [34].…”

Section: Microstructural Evaluation: Primary Dendrite Arm Spacing (Pdas)mentioning

confidence: 99%

“…The Kurz and Fisher (KF) model is one of the most traditional models with which the calculation of PDAS becomes available [34]. It should be mentioned that this model (Equation (13)) has been utilized in Al-Mg systems in which PDAS has reported to be accurate with regards to experimental results [5].…”

Section: Microstructural Evaluation: Primary Dendrite Arm Spacing (Pdas)mentioning

confidence: 99%

“…It has been reported that hot cracking phenomenon is eliminated during laser welding of 5456 aluminum alloy by performing preheating just before welding [1]. Researchers have found that increasing pulse overlapping factor induces an increase in Mg loss so that a tendency to formation of excessive solidification cracking occurs [5]. With all these results considered, it is obvious that the solidification process and optimization of laser parameters are determining factors in the performance of laser welds and the resulting microstructures.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A Comparative Study of Analytical Rosenthal, Finite Element, and Experimental Approaches in Laser Welding of AA5456 Alloy

Hekmatjou

Zeng

Shen

et al. 2020

Metals

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The thermal regime and microstructural phenomenon are studied by using finite-element (FE) modelling and the analytical Rosenthal equation during laser welding of aluminum alloy 5456 (AA5456) components. A major goal is to determine the merits and demerits of this analytical equation which can be an alternative to FE analysis, and to evaluate the effect of imperative assumptions on predicted consequences. Using results from the analytical and numerical approaches in conjunction with experiments, different physical features are compared. In this study, the results obtained from experiments in terms of melt pool shapes are compared with the predicted ones achieved from the numerical and analytical approaches in which the FE model is more accurate than the Rosenthal equation in the estimation of the melt pool dimensions. Furthermore, as to the partially melted zones, the estimations achieved from the numerical modeling are more genuine than ones from the analytical equation with regards to the experimental results. At high energy density, near keyhole welding mode, the reported results show that experimental melt widths are supposed to be narrower than the fusion widths estimated by the analytical solution. The primary explanation could be the influence of thermal losses that occurred during convection and radiation, which are neglected in the Rosenthal equation. Additionally, the primary dendrite arm spacing (PDAS) estimated with the numerical modeling and the analytical Rosenthal solution is comparable with the experimental results obtained.

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Section: Thermal Modelingmentioning

confidence: 99%

Section: Predicted Temperature-dependent Parametersmentioning

confidence: 99%

Section: Microstructural Evaluation: Primary Dendrite Arm Spacing (Pdas)mentioning

confidence: 99%

Section: Microstructural Evaluation: Primary Dendrite Arm Spacing (Pdas)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Comparative Study of Analytical Rosenthal, Finite Element, and Experimental Approaches in Laser Welding of AA5456 Alloy

Hekmatjou

Zeng

Shen

et al. 2020

Metals

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Effect of process parameters on pulsed laser welding of AA5083 alloy using response surface methodology and pulse shape variation

Chludzinski

Santos

Churiaque

et al. 2022

Int J Adv Manuf Technol

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Aluminium alloys exhibit eco-friendly aspects related to global environmental issues, such as almost unlimited recyclability. Nevertheless, some intrinsic characteristics are challenges to explore all their benefits. In the welding process, the high thermal conductivity and low melt point require high control of heat input. Alternatively, the pulsed laser mode provides a sharp beam focus with precise control enabling regulating the energy delivered. In this sense, this present work analysed the effect of pulsed laser welding parameters on 3-mm-thick AA5083 aluminium alloy sheets. Trials targeted to develop sound welds with minimum defect and high penetration depth adopting statistical methods. The optimum parameter arrangement was achieved by varying peak power, spot diameter, and pulse duration. Finally, the best parameter combination was applied using different pulse shapes to mitigate crack formation and pores. As a result, the pulse shape with step-down at the end of each pulse generated crack-free spot welds.

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Analytical and experimental investigation on the distribution of solidification crack initiation sites throughout a laser spot weld

Sheikhi

Beiranvand

Ghaini

et al. 2023

Int J Adv Manuf Technol

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Solidification cracking susceptibility in pulsed laser welding of Al–Mg alloys

Cited by 17 publications

References 12 publications

A Comparative Study of Analytical Rosenthal, Finite Element, and Experimental Approaches in Laser Welding of AA5456 Alloy

A Comparative Study of Analytical Rosenthal, Finite Element, and Experimental Approaches in Laser Welding of AA5456 Alloy

Effect of process parameters on pulsed laser welding of AA5083 alloy using response surface methodology and pulse shape variation

Analytical and experimental investigation on the distribution of solidification crack initiation sites throughout a laser spot weld

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