Effects of welding speed, energy input and heat source distribution on temperature variations in butt joint welding

Gery, D.; Long, Hui; Maropoulos, Paul

doi:10.1016/j.jmatprotec.2005.06.018

Cited by 263 publications

(154 citation statements)

References 8 publications

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“…Young's modulus and tangential modulus (E and E t ) in the simulation of mechanical phenomena are temperature dependent, whereas yield strength (Y) depends on temperature and phase composition. based on work presented in [39,40] young's modulus and tangential modulus are set to 2×10 5 MPa and 2×10 4 MPa, yield strength 200 MPa, 320 MPa, 600 MPa, 1200 MPa and 320 MPa for austenite, ferrite, bainite, martensite and pearlite respectively in temperature 300 K. In temperatures T≥1700 K Young's modulus and tangential modulus equal 100 MPa and 10 MPa, whereas yield strength equals 5 MPa. These values are approximated using square functions (Fig.7).…”

Section: Examples Of Numerical Prediction Of Structure Composition Inmentioning

confidence: 99%

Modelling and Analysis of Phase Transformations and Stresses in Laser Welding Process / Modelowanie I Analiza Przemian Fazowych I Naprężeń W Procesie Spawania Laserowego

Piekarska¹

2015

Archives of Metallurgy and Materials

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The work concerns the numerical modelling of structural composition and stress state in steel elements welded by a laser beam. The temperature field in butt welded joint is obtained from the solution of heat transfer equation with convective term. The heat source model is developed. Latent heat of solid-liquid and liquid-gas transformations as well as latent heats of phase transformations in solid state are taken into account in the algorithm of thermal phenomena. The kinetics of phase transformations in the solid state and volume fractions of formed structures are determined using classical formulas as well as Continuous-Heating-Transformation (CHT) diagram and Continuous-Cooling-Transformation (CCT) diagram during welding. Models of phase transformations take into account the influence of thermal cycle parameters on the kinetics of phase transformations during welding. Temporary and residual stress is obtained on the basis of the solution of mechanical equilibrium equations in a rate form. Plastic strain is determined using non-isothermal plastic flow with isotropic reinforcement, obeying Huber-Misses plasticity condition. In addition to thermal and plastic strains, the model takes into account structural strain and transformation plasticity. Changing with temperature and structural composition thermophysical parameters are included into constitutive relations. Results of the prediction of structural composition and stress state in laser butt weld joint are presented.

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Section: Examples Of Numerical Prediction Of Structure Composition Inmentioning

confidence: 99%

Modelling and Analysis of Phase Transformations and Stresses in Laser Welding Process / Modelowanie I Analiza Przemian Fazowych I Naprężeń W Procesie Spawania Laserowego

Piekarska¹

2015

Archives of Metallurgy and Materials

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“…The character and size of deformations depends on the physical properties of the base material, rigidity of a construction and the welding method. The proper selection of the welding technology and technological parameters of the process can reduce deformations in a large extent [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Prediction Of Deformations In Laser Welded Sheets Made Of X5CrNi18-10 Steel

Piekarska

Кубяк

Saternus

et al. 2015

Archives of Metallurgy and Materials

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The work concerns the numerical modelling of coupled thermal and mechanical phenomena occurring in the laser beam welding process. Commercial Abaqus FEA engineering software is adopted to numerical computations in order to perform a comprehensive analysis of thermo-mechanical phenomena. Created in Fortran programming language additional numerical subroutines are implemented into Abaqus solver, used to describe the power intensity distribution of the movable laser beam heat source. Temperature dependent thermomechanical properties of X5CrNi18-10 steel are adopted in the numerical analysis of stress and strain states. Mathematical and numerical models are verified on the basis of a comparison between selected results of computer simulations and experimental studies on butt-welded joints.Numerical simulations are presented for steel sheet with a thickness of 2 mm. Temperature distributions, the shape and size of melted zone as well as residual stress and deformations are presented for analyzed elements. Numerically determined deflections are compared with the measured deflection of welded joint.

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“…The quality of the joint is determined by process parameters such as: laser mode, beam radius, laser power and welding speed. Therefore, the knowledge about temperature profile of laser welded joints allows for a prediction of these parameters in terms of size and shape of the weld [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Mathematical and numerical models usually describe chosen phenomena, due to the computational complexity of the problem. Therefore, coupled thermal phenomena and phase transformations in solid state are usually ignored in numerical analysis of welding processes [5,8,9,15,16]. However, latent heat generated during phase transformations in heat treatment of steel influences temperature distribution and has a significant effect on numerically predicted microstructure composition [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Theoretical investigations into heat transfer in laser-welded steel sheets

Piekarska

Кубяк

2012

J Therm Anal Calorim

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This study contains mathematical modelling and numerical analysis of heat transfer in laser beam welding process. The temperature field was obtained on the basis of numerical solution into unsteady heat transfer equation with convective term and volumetric heat sources taken into account. Volumetric heat source model describing laser beam power distribution in combined truncated cone-cylinder volume was developed. Due to the wide range of temperatures appearing in the process latent heat of fusion, evaporation as well as latent heat of phase transformations in solid state were taken into account in the solution algorithm. On the basis of developed numerical algorithms an analysis of heat transfer in laser butt-welded steel sheets as a three-dimensional initial-boundary problem was performed.

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Effects of welding speed, energy input and heat source distribution on temperature variations in butt joint welding

Cited by 263 publications

References 8 publications

Modelling and Analysis of Phase Transformations and Stresses in Laser Welding Process / Modelowanie I Analiza Przemian Fazowych I Naprężeń W Procesie Spawania Laserowego

Modelling and Analysis of Phase Transformations and Stresses in Laser Welding Process / Modelowanie I Analiza Przemian Fazowych I Naprężeń W Procesie Spawania Laserowego

Numerical Prediction Of Deformations In Laser Welded Sheets Made Of X5CrNi18-10 Steel

Theoretical investigations into heat transfer in laser-welded steel sheets

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