Effects of residual stresses on the static and fatigue strength of laser-welded lap joints with different welding speeds

Sindhu, R.; Park, M. K.; Lee, S. J.; Lee, K. D.

doi:10.1007/s12239-010-0102-5

Cited by 14 publications

(14 citation statements)

References 3 publications

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“…Observou-se que as tensões de tração na camada austenítica foram parcialmente relaxadas, passando as tensões de tração a tensões de compressão na camada mais próxima da superfície. Este efeito é particularmente favorável no caso de estruturas sujeitas à fadiga [22], ou à corrosão sob tensão [23]. Quando são comparados os valores de tensões residuais obtidos a maiores profundidades na amostra TT620 com os valores da amostra sem tratamento térmico, verifica-se apenas uma ligeira redução das tensões residuais de tração.…”

Section: Resultados Experimentaisunclassified

A utilização da difração de neutrões na determinação do perfil de tensões residuais em revestimentos por soldadura

et al. 2013

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Section: Resultados Experimentaisunclassified

A utilização da difração de neutrões na determinação do perfil de tensões residuais em revestimentos por soldadura

et al. 2013

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“…Residual stresses introduced in the weld bead are a consequence of incompatible thermal strains caused by heating and cooling cycles during the laser penetration welding process, and the solidification cracks can ultimately be attributed to the welding residual stresses [5]. ere is a stage between the start and end of solidification where the material exhibits brittle behavior, even though the material is ductile.…”

Section: Constitutive Coupling Relationmentioning

confidence: 99%

“…However, solidification crack formation in the fusion welding process continues to be one of the major challenges in the use of laser penetration welding technology to join ultrafine-grained steels [4]. For example, the use of laser penetration welding for new structural components still requires significant amounts of engineering data to determine its effects on the mechanical properties, such as tensile strength, fatigue strength, and the generation of residual stresses [5]. During the laser penetration welding process, the heat transfer and liquid metal flow in the molten pool affect the grain growth direction, which may affect the weld seam structure and the properties of the weld [6].…”

Section: Introductionmentioning

confidence: 99%

“…Measured residual stress data can be used for fracture analysis, safety design, and strength evaluations. However, it is difficult to experimentally measure the evolution of residual stress and solidification cracks due to the strong interference from the arc light, the rapid change in temperature, and the phase transition [5]. us, numerical simulations can provide valuable information to understand the laser penetration welding process of ultrafine-grained steels.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigations on Residual Stress in Laser Penetration Welding Process of Ultrafine‐Grained Steel

Liu

et al. 2018

Advances in Materials Science and Engineering

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Weld solidification crack prevention in the laser penetration welding process is essential for the strength of the welded component. The formation of solidification cracks can ultimately be attributed to welding residual stresses, and preventive measures should be taken during welding. In this study, the effects of residual stresses on the laser penetration welding quality of ultrafine-grained steels were investigated. A heat source model was established through the analysis of the metallography of the cross section of the heat-affected zone (HAZ) of ultrafine-grained AN420s-grade steel, and the chemical composition of the weld bead was obtained using an FLS980-stm Edinburgh fluorescence spectrometer. Furthermore, the constitutive coupling relation between the temperature and material flow stress was established based on the Gibbs function, and the welding residual stress was obtained by setting trace points in a finite element analysis (FEA) model based on experimental data of the weld bead cross section under different welding conditions. The results show that weld solidification cracks will form when the residual stresses exceed the material flow stresses in the weld bead, and the residual stresses can be decreased through a reasonable increase of the welding speed. The results indicate that the proposed criterion has high accuracy and can be used to predict the formation of weld solidification cracks in the laser penetration welding process.

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“…The penetration and non-penetration laser welded lap joints are common joining method in rail passenger cars, and the non-penetration laser lap welding is an assembling method for side facade panels of passenger cars, which can not only improve corrosion resistances but also provide vehicle body with a weld-free appearance [5]. However, unlike penetration laser welded lap joints, the fatigue fracture of non-penetration laser welded lap joints usually occurs in the non-penetrated plate even if its nominal stress is much smaller than the penetration plate, which results in a large difference in fatigue performance between the two lap joints [6][7][8][9]. Despite many studies devoted to fatigue performance of laser welding [10][11][12][13][14], there are very limited research reports on the quantitative differences of fatigue properties between the penetration and nonpenetration laser welded joints.…”

Section: Introductionmentioning

confidence: 99%

Fatigue resistance and failure behavior of penetration and non-penetration laser welded lap joints

Guo

Liu²,

et al. 2020

Preprint

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The fatigue resistance and failure behaviour of penetration 1.5 + 0.8-P and non-penetration 0.8 + 1.5-N laser welded lap joints prepared with 0.8 mm and 1.5 mm cold-rolled 301L plates were investigated. The weld beads showed a solidification microstructure of primary ferrite with good thermal cracking resistance, and their hardness was lower than that of the plates. The 1.5 + 0.8-P joint exhibited a better resistance to high-cycle fatigue failure, while the 0.8 + 1.5-N joint showed a higher resistance to low-cycle fracture. The failure modes of 0.8 + 1.5-N and 1.5 + 0.8-P joints were 1.5 mm and 0.8 mm lower lap plate fracture, respectively, and the primary cracks were initiated at welding fusion lines on the lap surface. There were long plastic ribs on the penetration plate fracture, but not on the non-penetration plate fracture. The fatigue resistance stress of the penetration and non-penetration plates in the crack initiation areas calculated based on the mean fatigue limits is 408 MPa and 326 MPa, respectively. The main reason for the difference in fatigue performance between the two laser welded joints was that the asymmetrical heating in the non-penetration plate thickness resulted in higher residual stress near the welding fusion line.

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Effects of residual stresses on the static and fatigue strength of laser-welded lap joints with different welding speeds

Cited by 14 publications

References 3 publications

A utilização da difração de neutrões na determinação do perfil de tensões residuais em revestimentos por soldadura

A utilização da difração de neutrões na determinação do perfil de tensões residuais em revestimentos por soldadura

Numerical Investigations on Residual Stress in Laser Penetration Welding Process of Ultrafine‐Grained Steel

Fatigue resistance and failure behavior of penetration and non-penetration laser welded lap joints

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