Development of a Comprehensive Process Model for Hybrid Laser-Arc Welding

Kong, Fang; Kovacevic, Radovan

doi:10.5772/45850

Cited by 5 publications

(7 citation statements)

References 46 publications

(57 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mechanical properties above the cut-off temperature have little influence on the numerically-predicted residual stress [30]. The melting temperature of A514 steel is 1500°C, and its vaporization temperature is 2800°C [28]. A cut-off temperature of 1000°C was employed in this study.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Numerical Modeling and Experimental Verification of Residual Stress in Autogenous Laser Welding of High-Strength Steel

Liu

Kong

et al. 2015

Lasers Manuf. Mater. Process.

Self Cite

View full text Add to dashboard Cite

A three-dimensional finite element (FE) model was developed to numerically calculate the temperature field and residual-stress field in the autogenous laser welding process. The grid independence of the FE model was verified to eliminate the variation of the heat flux between adjacent elements. A cutoff temperature method with combination of the tensile testing was used to consider the effect of hightemperature material properties on the numerical simulation. The effect of the latent heat of fusion and evaporation was also taken into consideration. High compressive initial stress was presented in the selected high-strength steel plates. A subroutine was written to consider the initial stress in the FE mode. Predicted residual stress agreed well with experimental data obtained by an X-ray diffraction technique. Results showed that the transverse and longitudinal residual stresses prevailed in the autogenous laser welding process, and the thermal stress concentration occurred in the molten pool and its adjacent regions. The effect of the welding speed on the distribution of residual stress was also studied. The values of residual stress decreased with an increase in the welding speed.

show abstract

Section: Mechanical Propertiesmentioning

confidence: 99%

Numerical Modeling and Experimental Verification of Residual Stress in Autogenous Laser Welding of High-Strength Steel

Liu

Kong

et al. 2015

Lasers Manuf. Mater. Process.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The material properties relevant to residual stresses are Young's modulus, yield strength, Poisson's ratio and the coefficient of thermal expansion. By considering the elasticplastic material properties, the total strain in the SAW weld can be decomposed into three components as given by [45]:…”

Section: Mechanical Analysismentioning

confidence: 99%

Investigation of temperature and residual stresses field of submerged arc welding by finite element method and experiments

Nezamdost

Esfahani

Hashemi

et al. 2016

Int J Adv Manuf Technol

View full text Add to dashboard Cite

This article reports on a numerical and experimental investigation to understand and improve computer methods in application of the Goldak model for predicting thermal distribution in submerged arc welding (SAW) of APIX65 pipeline steel. Accurate prediction of the thermal cycle and residual stresses will enable control of the fusion zone geometry, microstructure, and mechanical properties of the SAW joint. In this study, a new Goldak heat source distribution model for SAW is presented first. Both 2D and 3D finite element models are developed using the solution of heat transfer equations in ABAQUS Standard implicit. The obtained results proved that the 2D axi-symmetric model can be effectively employed to simulate the thermal cycles and the welding residual stresses for the test steel. As compared to the 3D analysis, the 2D model significantly reduced the time and cost of the FE computation. The numerical accuracy of the predicted fusion zone geometry is compared to the experimentally obtained values for bead-on-plate welds. The predictions given by the present model were found to be in good agreement with experimental measurements.

show abstract

“…During the FE analysis of the laser hot wire welding, a hybrid heat source model was used to consider the heat inputs provided by the laser and the hot wire power supply [12]. Based on the formed weld bead shape, the laser power was modeled as a volumetric heat source with a conical Gaussian profile [18].…”

Section: Governing Equationmentioning

confidence: 99%

“…The convection heat transfer in the molten pool was neglected to simplify the numerical solution. When the temperature of the material was above the melting point, the thermal conductivity was increased to twice that of the actual value in order to compensate for the fluid flow in the molten pool [12,15].…”

Section: Governing Equationmentioning

confidence: 99%

“…In comparison to autogenous laser welding, LHW is characterized by an additional heat source. In order to combine two heat sources during welding, Kong and Kovacevic [12] developed a hybrid heat source model in which a double-ellipsoidal heat source was used to describe the arc power, and a volume heat source was selected to describe the laser power. The second feature of LHW is the phase transformation in the weld zone caused by a larger heat input and by an addition of the filler material.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and numerical investigation of laser hot wire welding

Liu

et al. 2015

Int J Adv Manuf Technol

Self Cite

View full text Add to dashboard Cite

With respect to autogenous laser welding, laser welding assisted by a hot wire was capable of saving the consumption of laser power, tailoring the mechanical and physical properties of welds, and improving the gapbridging capability. In this work, the influences of welding parameters were investigated to combine the positive aspects of laser beam and hot wire. Sound welds were obtained when the laser beam was focused inside the samples. The welding direction had a significant effect on the gap-bridging capability, while the offset distance between the laser focal spot and hot wire tip determined the stability of the feeding of the hot wire into the molten pool. The effect of hot wire on the temperature field and thermally induced residual stress of laser welding was investigated by using the finite element method. X-ray diffraction technique was used to measure the residual stress at the obtained weld beads, and a good agreement between the experimental and numerical results was achieved. Results showed that the transverse and longitudinal stresses prevailed in the laser hot wire welding process, and the thermal stress concentration occurred in the weld pool. When the hot wire voltage was lowered, the residual stresses, especially the transverse residual stress, were markedly reduced.

show abstract

Development of a Comprehensive Process Model for Hybrid Laser-Arc Welding

Cited by 5 publications

References 46 publications

Numerical Modeling and Experimental Verification of Residual Stress in Autogenous Laser Welding of High-Strength Steel

Numerical Modeling and Experimental Verification of Residual Stress in Autogenous Laser Welding of High-Strength Steel

Investigation of temperature and residual stresses field of submerged arc welding by finite element method and experiments

Experimental and numerical investigation of laser hot wire welding

Contact Info

Product

Resources

About