Modeling and experimental analysis of fiber laser offset welding of Al-Ti butt joints

Casalino, Giuseppe; Mortello, Michelangelo

doi:10.1007/s00170-015-7562-8

Cited by 69 publications

(24 citation statements)

References 21 publications

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“…Due to the high quality, high efficiency, and unrelenting repeatability, lasers have been widely applied in many materials processing processes, such as welding [7][8][9][10][11][12][13], cutting [14][15][16], additive manufacturing [17][18][19][20], and so on, and they have been used to process many types of materials, including metals, ceramics, glass, and polymers. Owing to the high power density, the laser generally results in welds with high precision and a small heat affected zone (HAZ) and, therefore, is considered as a good candidate to join the tiny sintered NdFeB components.…”

Section: Introductionmentioning

confidence: 99%

Influences of Laser Spot Welding on Magnetic Property of a Sintered NdFeB Magnet

Chang

et al. 2016

Metals

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Laser welding has been considered as a promising method to join sintered NdFeB permanent magnets thanks to its high precision and productivity. However, the influences of laser welding on the magnetic property of NdFeB are still not clear. In the present paper, the effects of laser power on the remanence (Br) were experimentally investigated in laser spot welding of a NdFeB magnet (N48H). Results show that the Br decreased with the increase of laser power. For the same welding parameters, the Br of magnets, that were magnetized before welding, were much lower than that of magnets that were magnetized after welding. The decrease in Br of magnets after laser welding resulted from the changes in microstructures and, in turn, the deterioration of magnetic properties in the nugget and the heat affected zone (HAZ) in a laser weld. It is recommended that the dimensions of nuggets and HAZ in laser welds of a NdFeB permanent magnet should be as small as possible, and the magnets should be welded before being magnetized in order to achieve a better magnetic performance in practical engineering applications.

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Section: Introductionmentioning

confidence: 99%

Influences of Laser Spot Welding on Magnetic Property of a Sintered NdFeB Magnet

Chang

et al. 2016

Metals

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“…It must be noted that the total stress σ in the integral (16) must be replaced by Equation (6), which is written as follows.…”

Section: The Xfem Formulation Of Governing Equationsmentioning

confidence: 99%

“…Das [5] developed a model of the heat transfer during welding by the Element Free Galerkin (EFG) method, and demonstrated the effectiveness and utilities of the EFG method for modeling and understanding the heat transfer processes in arc welding. Casalino [6] calculated the temperature distribution and thermal cycle in the workpiece by finite element analysis in dissimilar aluminum titanium laser welding, and he also carried out the finite element method (FEM) study of full penetration keyhole laser welding of Ti6Al4V in butt configuration by varying the modeling strategy of the thermal source [7]. Sheikhi [8] investigated the underlying mechanism involved in the of the thermal source [7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Thermo-Elastic Fracture Problem during Aluminium Alloy MIG Welding Using the Extended Finite Element Method

Yang

Xiao

et al. 2017

Applied Sciences

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Abstract:The thermo-elastic fracture problem and equations are established for aluminium alloy Metal Inert Gas (MIG) welding, which include a moving heat source and a thermoelasticity equation with the initial and boundary conditions for a plate structure with a crack. The extended finite element method (XFEM) is implemented to solve the thermo-elastic fracture problem of a plate structure with a crack under the effect of a moving heat source. The combination of the experimental measurement and simulation of the welding temperature field is done to verify the model and solution method. The numerical cases of the thermomechanical parameters and stress intensity factors (SIFs) of the plate structure in the welding heating and cooling processes are investigated. The research results provide reference data and an approach for the analysis of the thermomechanical characteristics of the welding process.

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“…Casalino et al showed that this offset can produce a highly resistant weld, free of porosity and spatter, with no need for filler or groove preparation [22,23].…”

Section: Introductionmentioning

confidence: 99%

Control of Porosity and Spatter in Laser Welding of Thick AlMg5 Parts Using High-Speed Imaging and Optical Microscopy

Popescu

Delval

Leparoux

2017

Metals

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Abstract:We report on a feedback mechanism for rapid identification of optimal laser parameters during welding of AlMg5 coupons using real-time monitoring by high-speed imaging. The purpose was to constrain the liquid movement in the groove in order to obtain pore-free welds in this otherwise difficult-to-weld alloy. High-speed imaging of the welding process via an optical microscope allowed for recording at millimeter level, providing new information on liquid-metal dynamics during laser irradiation as well as plausible explanations for spatter occurrence and pores formation. The pore formation and especially the position of these pores had to be controlled in order to weld 3 mm thick samples. By tuning both laser power and pulse duration, pores were aligned on a single line, at the bottom of the weld. A laser pass of reduced power on that side was then sufficient for removing all pores and providing a suitable weld.

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Modeling and experimental analysis of fiber laser offset welding of Al-Ti butt joints

Cited by 69 publications

References 21 publications

Influences of Laser Spot Welding on Magnetic Property of a Sintered NdFeB Magnet

Influences of Laser Spot Welding on Magnetic Property of a Sintered NdFeB Magnet

Analysis of Thermo-Elastic Fracture Problem during Aluminium Alloy MIG Welding Using the Extended Finite Element Method

Control of Porosity and Spatter in Laser Welding of Thick AlMg5 Parts Using High-Speed Imaging and Optical Microscopy

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