Dissimilar steels laser welding: Experimental and numerical assessment of weld mixing

Métais, Alexandre; Matteı, Simone; Tomashchuk, Iryna; Cicala, Eugèn; Gaied, Sadok

doi:10.2351/1.4983168

Cited by 6 publications

(6 citation statements)

References 9 publications

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“…For complete penetration welds, eddies with highest flow velocity were formed due to Marangoni convection. Previous studies showed that the Marangoni effect was more significant near the bottom surface of TWIP molten pool, which determined the weld geometry [12]. In this present, the Marangoni effect was gradually stronger with the heat input increased, which resulted in a larger weld width on the bottom side.…”

Section: Experimental Methodssupporting

confidence: 42%

Effect of heat input on microstructure and properties of dissimilar laser welded joints between TWIP and TRIP steels

Sun

Wang

et al. 2019

Metall. Res. Technol.

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In this present, the experimental steels were produced by different rolling and heat treatment processes. After that, dissimilar laser tailor welding was carried out with different heat inputs (40, 60 and 100 J/ mm 2 ) using IPG YLR 6000 fiber laser with Ar gas shielding. Hitachi SU5000 scanning electron microscope (SEM) and Zeiss Axio Vert.Al optical microscope were used to observe the microstructure of the welded joints after being polished and etched with 4% nital. HV-1000 microhardness tester was used to measure the microhardness of welded joints. Tensile test was carried out using DNS-100 universal material testing equipment, and Erichsen test was conducted using CTM604 Erichsen test machine. Five groups of repeated experiments were selected for the performance test. Tensile fracture surface morphology of welded joint was observed by SEM. The effect of heat input on microstructure and properties of dissimilar welded joints between high manganese TWIP steels and low manganese TRIP steels was studied. The results showed that weld width and penetration were increased and complete penetration was obtained when the heat input increased to 60 J/ mm 2 . With heat input increased, the microstructure of welded seam was more inhomogeneous. The distribution of Mn content in welded seam was inhomogeneous such that columnar/equiaxed austenite was formed in rich Mn zone and lath martensite was formed in barren Mn zone. Heat input had no influence on the microstructure and hardness on the HAZ. The mechanical properties of welded joints of 60 J/mm 2 were superior and its strength-ductility balance was greater than TRIP BM (23 GPa%) and was 82% of TWIP BM (36 GPa%). The formability of 60 and 100 J/mm 2 was similar.

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Section: Experimental Methodssupporting

confidence: 42%

Effect of heat input on microstructure and properties of dissimilar laser welded joints between TWIP and TRIP steels

Sun

Wang

et al. 2019

Metall. Res. Technol.

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“…Despite the difficulties due to the determination of fluid flow in the weld pool, the obtained outcomes resulted to be reliable based on the fluid flow patterns validated in previous work [19,20,23]. Figure 12 shows the temperature and velocity vector magnitude distribution at the intersection between the top surface and the orthogonal plane parallel to the y-axis (i.e., orthogonal to the welding direction) and containing the point where the laser is applied.…”

Section: Case Study #3: Dissimilar Butt Joint Welding Of Ti-6al-4v Anmentioning

confidence: 66%

“…Their results showed that both heat and mass transport are significantly influenced by convection during the laser spot welding process. Métais et al [23] investigated the alloy element mixing in the weld pool using a 3D multiphysical model in the laser welding of two different steels. They found that the tensile behavior of the welds is related to levels of Mn and C dilutions.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of fluid flow, heat, and mass transfer for similar and dissimilar laser welding of Ti-6Al-4V and Inconel 718

Faraji

Maletta

Barbieri

et al. 2021

Int J Adv Manuf Technol

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Most of the researches published on the numerical modeling of laser welding are looking at similar welding, mainly due to the difficulty of simulating the mixing phenomenon that occurs in dissimilar welding. Furthermore, numerical modeling of dissimilar laser welding of titanium and nickel alloys has been rarely reported in the literature. In this study, a 3D finite volume numerical model is proposed to simulate fluid flow, heat, and mass transfer for similar and dissimilar laser welding of Ti-6Al-4V and Inconel 718. The laser source was simulated by volumetric heat distribution, which considers the effects of keyhole and heat transfer on the workpiece. The heat source parameters were calibrated through preliminary experiments, by comparing the simulated and experimental weld pool shapes and dimensions. The model was used to simulate both homogenous and dissimilar laser weldings of Ti-6Al-4V and Inconel 718, and a systematic comparison was carried out through a number of selected experiments. The effects of three distinct levels of laser power (1.25 kW, 1.5 kW, 2.5 kW) on temperature distribution and velocity field in the welds pool were analyzed. Results highlighted the effects of Marangoni forces in the weld pool formation. Furthermore, in order to analyze the mass transfer phenomenon in dissimilar welding, species transfer equations were considered, demonstrating the important role played by the mass mixture in the weld pool formation. Finally, a high level of agreement between simulations and experiments—in terms of weld pool shape and dimensions—was observed in all cases analyzed. This proves the ability of the proposed numerical model to properly simulate both the similar and dissimilar welding of Ti-6Al-4V and Inconel 718 alloys.

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“…Table 4. Mechanical and thermo-physical properties at room temperature of DP, TWIP and AISI 316 steels [22][23][24].…”

Section: Geometry and Meshmentioning

confidence: 99%

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

2020

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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.

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Dissimilar steels laser welding: Experimental and numerical assessment of weld mixing

Cited by 6 publications

References 9 publications

Effect of heat input on microstructure and properties of dissimilar laser welded joints between TWIP and TRIP steels

Effect of heat input on microstructure and properties of dissimilar laser welded joints between TWIP and TRIP steels

Numerical modeling of fluid flow, heat, and mass transfer for similar and dissimilar laser welding of Ti-6Al-4V and Inconel 718

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

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