The hourglass-like heat source model and its application for laser beam welding of 6 mm thickness 1060 steel

Zhan, Xiaoli; Mi, Gaoyang; Zhang, Qi; Wei, Yanhong; Ou, Wenmin

doi:10.1007/s00170-016-8797-8

Cited by 23 publications

(6 citation statements)

References 16 publications

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“…Thus, one possible reason of this deviations could be the different heat diffusion phenomena along the sheets that takes place in welds with different thicknesses. While few experimental observations of the molten pool are available in previous studies like the one by Artinov et al [24], several published numerical results indicates that the width of the molten pool is usually larger (transversal direction), as shown by Zhan et al [15], and longer (longitudinal direction), as shown by Artinov et al [25], on the weld top rather on the bottom, contrary to what was found in this work (Fig. 8c).…”

Section: Numerical Resultscontrasting

confidence: 83%

“…Farrokhi et al [14] presented a modified version of the three dimensional conical heat source developed by Wu and coworkers, consisting in two conical moving heat sources, in which the heat density distribution region is first linearly decreased along the thickness and then it follows a reverse cone configuration to obtain an hourglass shape distribution. The same approach has been used by Zhan et al [15]. To better calibrate the weld pool dimensions, a variable peak value of thermal flow along the thickness was used by Rong et al [16].…”

Section: Introductionmentioning

confidence: 99%

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Thermal Finite Element Modelling of the Laser Beam Welding of Tailor Welded Blanks through an Equivalent Volumetric Heat Source

Busto

Coviello

Lombardi

et al. 2021

Preprint

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In last decades, several numerical models of the keyhole laser welding process were developed in order to simulate the joining process. Most of them are sophisticated multiphase numerical models tempting to include all the several different physical phenomena involved. However, less computationally expensive thermo-mechanical models that are capable of satisfactorily simulating the process were developed as well. Among them, a moving volumetric equivalent heat source, whose dimensions are calibrated on experimental melt pool geometries, can estimate some aspects of the process using a Finite Element Method (FEM) modelling with no need to consider fluid flows. In this work, a double-conical volumetric heat source is used to arrange a combination of two half hourglass-like shapes with different dimensions each other. This particular arrangement aims to properly assess the laser joining of a Tailor Welded Blank (TWB) even in case of butt joint between sheets of different thicknesses. Experiments of TWBs made of 22MnB5 steel sheets were conducted in both equal and different thicknesses configurations in order to validate the proposed model. The results show that the model can estimate in a satisfactory way the shape and dimensions of the fused zone in case of TWB made of sheets with different thickness.

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Section: Numerical Resultscontrasting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Thermal Finite Element Modelling of the Laser Beam Welding of Tailor Welded Blanks through an Equivalent Volumetric Heat Source

Busto

Coviello

Lombardi

et al. 2021

Preprint

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“…e effect of welding speed on the depth of penetration, bead width, waist width, and depth of the waist for butt joint welds at a constant laser power of 250 W and focus position of 0 mm is shown in Figure 8. e depth of penetration, bead width, waist width, and depth of the waist decrease with the increase of welding speed, which is due to the decrease in the amount of heat input and less interaction time period between the laser beam source and the weld material [6]. e decrease range of the depth of penetration, Comparing Figure 7 with Figure 8, the change of bead width, waist width, and depth of the waist is more sensitive for welding speed than for laser power.…”

Section: Resultsmentioning

confidence: 99%

“…is an important criterion to evaluate the quality of laser welding and the results of numerical simulation, the weld profile of laser welding is studied by many scholars [5][6][7][8]. Tadamalle et al [9] investigate the influence of pulsed Nd : YAG laser welding process parameters on weld pool geometry.…”

Section: Introductionmentioning

confidence: 99%

Research on Heat Source Model and Weld Profile for Fiber Laser Welding of A304 Stainless Steel Thin Sheet

Fan

Zhang³

et al. 2018

Advances in Materials Science and Engineering

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A heat source model is the key issue for laser welding simulation. e Gaussian heat source model is not suitable to match the actual laser weld profile accurately. Furthermore, fiber lasers are widely recognized to result in good-quality laser beam output, a narrower weld zone, less distortion, and high process efficiency, compared with other types of lasers (such as CO 2 , Nd : YAG, and diode lasers). At present, there are few heat source models for fiber laser welding. Most of researchers evaluate the weld profile only by the bead width and depth of penetration, which is not suitable for the laser keyhole welding nail-like profile. is paper reports an experimental study and FEA simulation of fiber laser butt welding on 1 mm thick A304 stainless steel. A new heat source model (cylindrical and cylindrical) is established to match the actual weld profile using Marc and Fortran software. Four bead geometry parameters (penetration depth, bead width, waist width, and depth of the waist) are used to compare between the experimental and simulation results. e results show that the heat source model of cylindrical and cylindrical can match the actual shape of the fiber laser welding feasibly. e error range of the penetration depth, bead width, waist width, and depth of the waist between experimental and simulation results is about 4.1 ± 1.6%, 2.9 ± 2.0%, 13.6 ± 7.4/%, and 18.3 ± 8.0%, respectively. In addition, it is found that the depth of penetration is more sensitive to laser power rather than bead width, waist width, and depth of the waist. Welding speed has a similar influence on the depth of penetration, weld width, waist width, and depth of the waist.

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“…Zhan et al [34] also investigated the model of a heat source suitable for laser welding process modelling. They proposed an hourglass model of the heat source.…”

Section: Fig 11 Model Of Disc Source Of Heatmentioning

confidence: 99%

Prediction of Weld Deformations by Numerical Methods - Review

Kozak

2022

Polish Maritime Research

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The welding process is the basic technique of joining in the shipbuilding industry. This method generates welding distortions that cause a lot of problems during the manufacturing process due to both the time and cost of straightening as well as their influence on later stages of production. Proper preparation of welding processes plays a growing role in the shipbuilding industry and the development of calculating tools is being observed. The paper presents a review and critical analysis of numerical methods for the assessment of welding distortion.

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The hourglass-like heat source model and its application for laser beam welding of 6 mm thickness 1060 steel

Cited by 23 publications

References 16 publications

Thermal Finite Element Modelling of the Laser Beam Welding of Tailor Welded Blanks through an Equivalent Volumetric Heat Source

Thermal Finite Element Modelling of the Laser Beam Welding of Tailor Welded Blanks through an Equivalent Volumetric Heat Source

Research on Heat Source Model and Weld Profile for Fiber Laser Welding of A304 Stainless Steel Thin Sheet

Prediction of Weld Deformations by Numerical Methods - Review

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