Simulation of laser butt welding of AISI 316L stainless steel sheet using various heat sources and experimental validation

Chukkan, Jazeel Rahman; Vasudevan, M.; Muthukumaran, S.; Kumar, Rajiv; Chandrasekhar, N.

doi:10.1016/j.jmatprotec.2014.12.008

Cited by 163 publications

(42 citation statements)

References 13 publications

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“…In fusion based welding processes, such as laser, the gradient of peak 53 temperature followed by a variation in heating and cooling rates along a 54 weld induces residual stresses in the weld region and its neighborhood 55 [11,12]. The welding residual stress field depends on a variety of factors 56 such as: material properties, welding process parameters, pre-heating 57 temperature (if any) and dimensions of the structure to be welded as 58 well as imposed external restrain conditions [13].…”

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confidence: 99%

Residual stress analysis in laser welded NiTi sheets using synchrotron X-ray diffraction

et al. 2016

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Synchrotron radiation was used for fine probing the different regions of a laser welded NiTi joint. Measurements 20 were taken at 0.2 mm intervals, starting in the non-thermal affected material, through the heat affected zone, the 21 fusion zone and again across the heat affected zone finishing in the base material. Along the longitudinal direction 22 the residual stresses were found to be always tensile in the heat affected and fusion zones; along the transversal 23 direction, an inversion of the stress states was found. The magnitude of the residual stresses was found to be more 24 significant in the transversal direction due to constraints imposed during welding. The heat introduced during 25 welding has a stress relief effect on the cold-rolled base material, although it does not promote any solid-state 26 transformation. The effect of the heat input on the residual stress pattern and magnitude was identified and it 27 was seen that high heat input leads to a higher magnitude of the residual stresses in the weld and the stress relief 28 effect is observed over a larger extension from the weld centerline. This paper presents the first experimental 29 study on the determination of residual stresses on laser welded NiTi shape memory alloys.30

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confidence: 99%

Residual stress analysis in laser welded NiTi sheets using synchrotron X-ray diffraction

et al. 2016

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“…This difference is a result of the fitting of the heat source parameters. However, the results of this technique showed high efficiency in the transfer of computed weld pool geometry, which cannot be achieved by using common heat sources, such as the conical Gaussian heat source model [27], the cylindrical heat source model [28], or the combination of both [29,30]. These heat source models were mainly developed based on the cross-section of the weld, without considering the weld pool in the longitudinal section.…”

Section: Resultsmentioning

confidence: 99%

Numerical Simulation on the Origin of Solidification Cracking in Laser Welded Thick-Walled Structures

Bakir

Artinov

Gumenyuk

et al. 2018

Metals

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Abstract:One of the main factors affecting the use of lasers in the industry for welding thick structures is the process accompanying solidification cracks. These cracks mostly occurring along the welding direction in the welding center, and strongly affect the safety of the welded components. In the present study, to obtain a better understanding of the relation between the weld pool geometry, the stress distribution and the solidification cracking, a three-dimensional computational fluid dynamic (CFD) model was combined with a thermo-mechanical model. The CFD model was employed to analyze the flow of the molten metal in the weld pool during the laser beam welding process. The weld pool geometry estimated from the CFD model was used as a heat source in the thermal model to calculate the temperature field and the stress development and distributions. The CFD results showed a bulging region in the middle depth of the weld and two narrowing areas separating the bulging region from the top and bottom surface. The thermo-mechanical simulations showed a concentration of tension stresses, transversally and vertically, directly after the solidification during cooling in the region of the solidification cracking.

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“…The volumetric heat sources are the most studied distribution for over the years [16]. Recent volumetric heat source models are combinations of double ellipsoidal, cylindrical, and conical models [17]. A simple efficient model is a 3D conical Gaussian heat source [18].…”

Section: Heat Source Modelmentioning

confidence: 99%

Prediction of Weld Joint Shape and Dimensions in Laser Welding Using a 3D Modeling and Experimental Validation

Jacques¹,

Ouafi²

2017

MSA

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This paper presents an experimentally validated weld joint shape and dimensions predictive 3D modeling for low carbon galvanized steel in butt-joint configurations. The proposed modelling approach is based on metallurgical transformations using temperature dependent material properties and the enthalpy method. Conduction and keyhole modes welding are investigated using surface and volumetric heat sources, respectively. Transition between the heat sources is carried out according to the power density and interaction time. Simulations are carried out using 3D finite element model on commercial software. The simulation results of the weld shape and dimensions are validated using a structured experimental investigation based on Taguchi method. Experimental validation conducted on a 3 kW Nd: YAG laser source reveals that the modelling approach can provide not only a consistent and accurate prediction of the weld characteristics under variable welding parameters and conditions but also a comprehensive and quantitative analysis of process parameters effects. The results show great concordance between predicted and measured values for the weld joint shape and dimensions.

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Simulation of laser butt welding of AISI 316L stainless steel sheet using various heat sources and experimental validation

Cited by 163 publications

References 13 publications

Residual stress analysis in laser welded NiTi sheets using synchrotron X-ray diffraction

Residual stress analysis in laser welded NiTi sheets using synchrotron X-ray diffraction

Numerical Simulation on the Origin of Solidification Cracking in Laser Welded Thick-Walled Structures

Prediction of Weld Joint Shape and Dimensions in Laser Welding Using a 3D Modeling and Experimental Validation

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