A numerical model for full and partial penetration hybrid laser welding of thick-section steels

Farrokhi, Farhang; Endelt, Benny Ørtoft; Kristiansen, Morten

doi:10.1016/j.optlastec.2018.08.059

Cited by 56 publications

(20 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, it was in the early 1980s that John Goldak proposed a widely used model in the shape of a double ellipsoid. Although it is currently mainly used for simulation of arc welding processes, i.e., a technique with a liquid metal pool, after appropriate modifications it can also be used to simulate selected laser welding processes, as shown later in the article [ 16 , 21 , 22 , 23 , 28 , 29 ].…”

Section: Description Of the Problemmentioning

confidence: 99%

“…The second, in turn, shows wide remelting in both the face and root areas, with a narrow area melted in the middle of the bead (hourglass shape) ( Figure 4 c). The bead shape obtained when welding with full penetration depends on the type of device used, the process parameters, and sheet thickness as well as the type of material being welded [ 29 , 31 , 32 , 33 , 34 , 35 ]. The information found in the literature shows that the nature of the bead geometry changes at full penetration results from several complex phenomena that determine the flow of liquid metal in the molten pool and the convective heat that affects the shape of the bead [ 29 , 34 , 35 , 36 ].…”

Section: Description Of the Problemmentioning

confidence: 99%

“…Wu et al also proposed some modifications of the conical model where a modified three-dimensional cone model (TDC) was used to simulate the plasma welding process with the mesh technique [ 38 ]. Similarly proposed by Farrokhi et al in the case of hybrid welding, combined models based on a double three-dimensional conical heat source model for the reconstruction of “keyhole” welding conditions with partial and full penetration indicate the fact that in order to obtain the correct shape of the melted area, it is necessary to combine two or more volumetric models of heat sources [ 29 ]. In 2018, for the investigation of a dual-beam laser welding of aluminum sheets, He et al proposed modification of the cone-shaped heat source model for the lap joint configuration.…”

Section: Description Of the Problemmentioning

confidence: 99%

See 2 more Smart Citations

Heat Source Models in Numerical Simulations of Laser Welding

Kik

2020

Materials

View full text Add to dashboard Cite

The article presents new possibilities for modifying heat source models in numerical simulations of laser welding processes conducted using VisualWeld (SYSWELD) software. Due to the different power distributions and shapes of a laser beams, it was necessary to propose a modification of heat source models and methods of defining the heat introduced into a welded material in the case of simulations of welding processes using solid-state and high-power diode lasers. A solution was proposed in the form of modification of predefined heat source models in the case of simulations of welding processes using solid-state disc lasers and high-power diode lasers (HPDL). Based on the results of metallographic tests and the acquisition of thermal cycles of real laser welding processes, the process of calibration and validation of the proposed models of heat sources depending on the type of device used as well as the obtained shapes of fusion beads was carried out. The purpose and assumptions of this approach towards creating heat sources were also reported, comparing exemplary stresses and cumulative plastic strain distributions for the calculation variant using a standard and modified heat source model.

show abstract

Section: Description Of the Problemmentioning

confidence: 99%

Section: Description Of the Problemmentioning

confidence: 99%

Section: Description Of the Problemmentioning

confidence: 99%

See 1 more Smart Citation

Heat Source Models in Numerical Simulations of Laser Welding

Kik

2020

Materials

View full text Add to dashboard Cite

show abstract

“…In order to describe the laser beam power distribution, the laser beam was modelled as a cylindrical moving heat source with Gaussian heat flux distribution simulation, as showed in Figure 4 [34,35,36].…”

Section: Numerical Modelmentioning

confidence: 99%

Experimental and Numerical Study of AISI 4130 Steel Surface Hardening by Pulsed Nd:YAG Laser

et al. 2019

View full text Add to dashboard Cite

Laser surface transformation hardening (LSTH) of AISI 4130 was investigated by a Nd:YAG pulsed laser. Laser focal height (LFH), pulse width (LPW), scanning speed (LSS), and power (LP) varied during the experiments. The microstructure of the treated zone was characterized by optical (OM) and field emission scanning electron microscopy (FESEM). Micro-hardness was measured in the width and depth directions. Results showed that the hardness and depth of hardened layer increased by decreasing the LSS and the laser focal position (LFP), and by increasing the LPW. The results were compared with those obtained by furnace heat treatment of the same steel. Eventually, a finite element model was employed for the simulation of the LSTH of AISI 4130 steel and calculation of the heat-treated zone. The results showed that the model can predict with accuracy the temperature profile and the size and the shape of the laser hardened region.

show abstract

“…Modeling the hybrid laser-arc welding seems to be a reliable way to investigate the physical phenomena of the process [13]. In numerical simulation, it is important to ensure the accuracy of both thermal and mechanical analysis, which permits to evaluate the weldability and the structural deformation during the welding process [14]. calibration of the model is a prerequisite to establish good correlations between numerical and experimental results.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Mechanical Simulation of Hybrid Welding of DP/AISI 316 and TWIP/AISI 316 Dissimilar Weld

2020

View full text Add to dashboard Cite

In this paper, hybrid laser-MAG (metal active gas) welding of twinning-induced plasticity (TWIP) and dual-phase (DP) steels with austenitic stainless steel (AISI316) was simulated by means of the finite element method. A thermo-mechanical model, which uses a 3D heat sources, was developed using the software Simufact Welding. The calculated dimensions, shape and distortion of the weld were compared with the experimental results, thence the model was validated. The metallurgical transformations for the DP steel were evaluated using the continuous cooling transformation (CCT) diagram and the calculated cooling rate. The numerical model predicted accurately the shape of the molten pool, the thermal cycles as well as the geometrical distortion of the butt weld. Therefore, the numerical model showed a good reliability and its potential for further development.

show abstract

A numerical model for full and partial penetration hybrid laser welding of thick-section steels

Cited by 56 publications

References 47 publications

Heat Source Models in Numerical Simulations of Laser Welding

Heat Source Models in Numerical Simulations of Laser Welding

Experimental and Numerical Study of AISI 4130 Steel Surface Hardening by Pulsed Nd:YAG Laser

Thermo-Mechanical Simulation of Hybrid Welding of DP/AISI 316 and TWIP/AISI 316 Dissimilar Weld

Contact Info

Product

Resources

About