3-D transient analytical solution based on Green’s function to temperature field in friction stir welding

Haghpanahi, Mohammad; Salimi, Solaleh; Bahemmat, Pouya; Sima, Sadaf

doi:10.1016/j.apm.2013.05.034

Cited by 32 publications

(17 citation statements)

References 12 publications

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“…Generally, the temperature field, during the FSW process, not only affects the macro-residual stresses of the welded elements but also could have considerable effects on the microresidual stress through dictating the microstructural texture within the weld zone, which will be discussed. Various mathematical and experimental studies on the thermal history during the FSW process are well-documented in the literature and stipulate the profound effect of the welding parameters including welding speeds on the thermal field [27,28].…”

Section: Resultsmentioning

confidence: 99%

“…While FSW offers numerous advantages for joining lightweight alloys, which are not weldable using conventional techniques, significant residual stresses are inevitable. Furthermore, in FSW, both thermal and mechanical residual stresses are simultaneously formed which could be either tensile or compressive [3,4]. The tensile residual stress is mainly destructive while the compressive residual stress is commonly advantageous.…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic Measurements of Residual Stresses Caused by Severe Thermomechanical Deformation during FSW

et al. 2014

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In engineering processes, residual stresses can be intense once high plastic deformation and temperature gradient are involved. This is exactly the case for friction stir welding (FSW) in which both rotational and translational movements of the tool induce extreme temperature gradient and plastic deformation. In this research, the extents of longitudinal and transverse residual stresses are measured within the AA7075-T6 plates welded through FSW process using ultrasonic method. According to the obtained results, it can be found that the residual stress is of the tensile type adjacent to the welding line whereas it is of the compressive type far from the welding line. Another observation is that the longitudinal residual stresses are considerably greater than the transverse residual stresses. Furthermore, with the aim of investigating the effects of rotation and traverse velocities of the tool on residual stress, experiments are carried out at three different rotation and traverse velocities. Based on the acquired results, it is observed that upon increasing the rotation and traverse velocities, the longitudinal and transverse residual stresses decrease and increase, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrasonic Measurements of Residual Stresses Caused by Severe Thermomechanical Deformation during FSW

et al. 2014

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“…For more details regarding the effect of welding parameters on the temperature and applied force through the FSW process, see Refs. [25][26][27][28]. These two parameters compete with each other to reach a trade-off, which determines RS level induced by the underwater FSW process.…”

Section: Resultsmentioning

confidence: 99%

Effect of cooling media on residual stresses induced by a solid-state welding: underwater FSW

Papahn

Bahemmat

Haghpanahi

2015

Int J Adv Manuf Technol

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In this article, the effect of cooling media on the residual stresses (RS) induced by a solid-state welding process is scrutinized through measuring and comparing RS caused by friction stir welding (FSW) underwater and in open air using the non-destructive ultrasonic method for aluminum AA7075-T6. Underwater FSW as a solid-state welding method can extend the application of solid-state welding techniques in marine industry. Results reveal that the longitudinal and transverse RS reduce under the water compared to open air. This reduction in the longitudinal RS is the maximum within the nugget zone (about 17 %). Meanwhile, such reduction for the transverse RS reaches 70 % within the heat-affected zone. In addition, under both air and water, the longitudinal RS is several times greater than the transverse RS and is in tensile and compressive states inside and outside the nugget zone, respectively.

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“…The accuracy of the mentioned BC and generation terms has been verified for similar and dissimilar FSW. [30][31][32]…”

Section: Heat Generationmentioning

confidence: 99%

Study on residual stresses caused by underwater friction stir welding: FE modeling and ultrasonic measurement

Salimi

Bahemmat

Haghpanahi

2018

Proceedings of the Institution of Mechanical Engineers, Part E:

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Predicting residual stresses arising from the thermal and mechanical loading history during engineering processes including welding would be a viable tool to reach the optimum process parameters. In the present article, an elastothermo-visco-plastic model has been employed to estimate the residual stress caused by the underwater friction stir welding, which are resulted by large thermo-mechanical deformations on one hand and rapid cooling arising from the enormous non-uniform boiling heat convention of water on the other hand. Finally, the numerical results are compared with experimental data acquired by the ultrasonic method to evaluate the accuracy of the simulation process. Regarding the low temperature during underwater friction stir welding, the employed constitutive equations result in acceptable residual stress fields, while for in-air case, the amount of error increases significantly due to experience of high temperatures and intensification in hardening precipitation phenomena.

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3-D transient analytical solution based on Green’s function to temperature field in friction stir welding

Cited by 32 publications

References 12 publications

Ultrasonic Measurements of Residual Stresses Caused by Severe Thermomechanical Deformation during FSW

Ultrasonic Measurements of Residual Stresses Caused by Severe Thermomechanical Deformation during FSW

Effect of cooling media on residual stresses induced by a solid-state welding: underwater FSW

Study on residual stresses caused by underwater friction stir welding: FE modeling and ultrasonic measurement

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