Equivalent heat source approach in a 3D transient heat transfer simulation of full-penetration high power laser beam welding of thick metal plates

Artinov, Antoni; Bachmann, Markus; Rethmeier, Michael

doi:10.1016/j.ijheatmasstransfer.2018.02.058

Cited by 64 publications

(39 citation statements)

References 30 publications

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“…The mathematical formulation of the CFD problem under the assumptions made was used in similar studies and is presented below [17,33]. In this simulation setup, the workpiece moves relative to the origin of the Cartesian coordinate system which coincides with the origin of the heat source (fixed keyhole).…”

Section: Thermo-fluid Dynamicsmentioning

confidence: 99%

“…This kind of modelling is limited through computational resources and time and therefore remains highly challenging [24]- [26]. One solution method to this problem is proposed by the concept of the so-called equivalent heat source (EHS) [16,17]. It is based on the postulate that all heat source parameters required for the simulation of the heat propagation outside the weld pool are included into the solid-liquid interface, defined by the isotherm of the solidus temperature T S .…”

Section: Introductionmentioning

confidence: 99%

“…The concept of the EHS was used in the early sixties to solve 2D problems by the finite difference method (FDM) [27]. During the last two decades, also the 3D case of the problem is investigated by applying the FDM [28] and more recently the finite element method (FEM) [17].…”

Section: Introductionmentioning

confidence: 99%

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Assessment of thermal cycles by combining thermo-fluid dynamics and heat conduction in keyhole mode welding processes

Artinov

Karkhin

Khomich

et al. 2019

International Journal of Thermal Sciences

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A numerical framework for simulation of the steady-state thermal behaviour in keyhole mode welding has been developed. It is based on the equivalent heat source concept and consists of two parts: computational thermo-fluid dynamics and heat conduction. The solution of the thermo-fluid dynamics problem by the finite element method for a bounded domain results in a weld pool interface geometry being the input data for a subsequent heat conduction problem solved for a workpiece by a proposed boundary element method. The main physical phenomena, such as keyhole shape, thermo-capillary and natural convection and temperature-dependent material properties are taken into consideration. The developed technique is applied to complete-penetration keyhole laser beam welding of a 15 mm thick low-alloyed steel plate at a welding speed of 33 mm s −1 and a laser power of 18 kW. The fluid flow of the molten metal has a strong influence on the weld pool geometry. The thermo-capillary convection is responsible for an increase of the weld pool size near the plate surfaces and a bulge formation near the plate middle plane. The numerical and experimental molten pools, crosssectional weld dimensions and thermal cycles of the heat affected zone are in close agreement.

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Section: Thermo-fluid Dynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessment of thermal cycles by combining thermo-fluid dynamics and heat conduction in keyhole mode welding processes

Artinov

Karkhin

Khomich

et al. 2019

International Journal of Thermal Sciences

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“…Here, a simplified form of the numerical model was used to guarantee numerical stability and reasonable computing time. The main assumptions in the model were similar to those used in [22], and are given as follows:…”

Section: Cfd Modelmentioning

confidence: 99%

“…All out-of-plane strain components were neglected. The thermo-physical material properties were taken from [22].…”

Section: Thermo-mechanical Modelmentioning

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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Physical Fundamentals of Heat Conduction During Welding

Karkhin

2019

Thermal Processes in Welding

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Equivalent heat source approach in a 3D transient heat transfer simulation of full-penetration high power laser beam welding of thick metal plates

Cited by 64 publications

References 30 publications

Assessment of thermal cycles by combining thermo-fluid dynamics and heat conduction in keyhole mode welding processes

Assessment of thermal cycles by combining thermo-fluid dynamics and heat conduction in keyhole mode welding processes

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

Physical Fundamentals of Heat Conduction During Welding

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