Recent Achievements in Rotary, Linear and Friction Stir Welding of Metals Alloys

Casalino, Giuseppe

doi:10.3390/met10010080

Cited by 6 publications

(8 citation statements)

References 16 publications

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“…In common, the corrosion morphology is reflected by the synergetic effect of both the chemical composition and microstructural characteristics. In this study, because the difference in chemical composition before and after FSW is negligible due to the relatively low processing temperature compared to fusion welding [12,[35][36][37], we focus on the effect of microstructure on the corrosion attack. Two types of corrosion attack can be categorized as follows: (a) general corrosion attack on the overall surface and (b) selective corrosion attack on a localized region.…”

Section: Discussionmentioning

confidence: 99%

Corrosion Behavior and Microstructure of Stir Zone in Fe-30Mn-3Al-3Si Twinning-Induced Plasticity Steel after Friction Stir Welding

Kim

Fujii

Lee

2020

Metals

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The effect of friction stir welding on microstructure and corrosion property was studied in Fe-30Mn-3Al-3Si (wt.%) twinning-induced plasticity steel using both an electron backscattered diffractometer and electrochemical testing (i.e., polarization test and electrochemical impedance spectroscope). The stir zone has a relatively higher corrosion resistance with uniform dissolution on the surface despite after welding, whereas the base metal shows localized corrosion attack with deep and long degradation along the grain boundaries. This is due to the corrosion-resistant coincidence site lattice boundaries caused by discontinuous dynamic recrystallization via the grain boundary bulging during the friction stir welding.

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Section: Discussionmentioning

confidence: 99%

Corrosion Behavior and Microstructure of Stir Zone in Fe-30Mn-3Al-3Si Twinning-Induced Plasticity Steel after Friction Stir Welding

Kim

Fujii

Lee

2020

Metals

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“…Between the abovementioned parameters the influence of the tool tilt angle (Figure 1) on the welding quality is highlighted by the literature [4]. To illustrate, the presence of the tilt angle causes an additional forging force at the trailing side of the FSW [5].…”

Section: Introductionmentioning

confidence: 97%

The Influence of the Tool Tilt Angle on the Heat Generation and the Material Behavior in Friction Stir Welding (FSW)

Meyghani

Awang²

2022

Preprint

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In practical FSW, tool tilt angle plays a significant role in enhancing the weld quality due to the generated forging force in the trailing side. For thermomechanical analysis of FSW, most models did not consider the tool tilt angle or used a simplified assumption, which caused the inconsistence with the practical cases due to inappropriate treatment of the tool/workpiece contact conditions. To improve the accuracy of numerical simulation of FSW process, the tool tilt angle must be considered. In this study, specific considerations for mechanical boundary conditions in Eulerian domain is employed to investigate the tool tilt angle influence on the thermomechanical behavior in FSW. Aluminum 6061-T6 with the thickness of 6 mm under the rotational speed of 800 RPM, the transverse speed of 120 mm/min and the plunging depth of 0.1 mm were employed for the simulations. Results showed an almost symmetric temperature profile predicted by the model without considering the tool tilt angle, while after incorporating the tool tilt angle, the peak temperature point is moved to the tool backside, resulting in better material bonding, enhancing the weld joint quality. Without accounting for the tool tilt angle the highest temperature of 389°C is observed, while with the tilt angle the maximum temperature of 413°C is achieved. The temperature variations at different points of the leading and the trailing sides of the welding tool were measured. It was observed that, after considering the tilt angle, as the tool moves, a smooth and quick increase for the temperature at the tool leading side achieves. This smooth and quick increasing of the temperature at the leading side results in reducing the possibility of the formation of defects, cracks and voids. Finally, comparisons showed that the model computational time is acceptable and using Eulerian formulation leads to achieving a remarkable accuracy.

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“…Frictional behavior is studied to optimize the process and to investigate the thermomechanical behavior. In this regard, some of the literature [ 20 ] employed the Coulomb friction model as their friction model for modelling aluminum and magnesium, as the Coulomb friction model can be accurate at lower temperatures [ 21 , 22 , 23 , 24 ]. To dig down deeper into the problem, the Coulomb model can be accurate when the sticking condition is available [ 25 , 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

A Framework to Simulate Friction Stir Additive Manufacturing (FSAM) Using the Finite Element Method

Meyghani,

Teimouri

2024

Micromachines

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Defining an accurate friction model without having the mesh distortion in an optimized computational time has always been a significant challenge for modelling solid-state natural processes. The presented paper proposes an Eulerian frictional-based solid static model for the accurate modeling of sliding and sticking conditions for the friction stir additive manufacturing process (FSAM). For the frictional behavior, a modified friction model is proposed to investigate the sliding and sticking conditions during the process. The magnesium alloy is selected as the workpiece material and AZ31B-F is employed as the filler material. Two different subroutines, Dflux and Sfilm, are used in order to simulate the heat flux during the process. The convection and emission during the process are determined using the Goldak double ellipsoidal model. DC3D8 and C3D8R elements are employed as the thermal and mechanical models, respectively. The results indicated that the temperature sharply increased up to 870 °C in the first and the second layers. After that, the increasing rate becomes slower with a maxim temperature of 1310 °C. A linear cooling behavior is obtained at the cooling step. The stress results indicated that the tool and the filler material pressure play a significant role in increasing the stress at the center of the workpiece. On the sides of the workpiece, a peak stress is also obtained due to the clamping force. At the cooling phase for the center of the workpiece, the longitudinal residual stress of 5 MP and transverse residual stress of 7 MPa (compression) are achieved. The distortion of the workpiece is also investigated and a maximum value of 0.13 mm is obtained. To wrap up, it should be noted that by implementing an accurate sliding/sticking condition in a frictional based model, a more comprehensive investigation about frictional interactions and their influence on thermal and mechanical behavior can be carried out.

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Recent Achievements in Rotary, Linear and Friction Stir Welding of Metals Alloys

Abstract: Rotary, linear, and friction stir welding of metal alloys are solid-state joining processes in which a joint between two metals can be formed by a combination of frictional heating and applied force [...]

Cited by 6 publications

References 16 publications

Corrosion Behavior and Microstructure of Stir Zone in Fe-30Mn-3Al-3Si Twinning-Induced Plasticity Steel after Friction Stir Welding

Corrosion Behavior and Microstructure of Stir Zone in Fe-30Mn-3Al-3Si Twinning-Induced Plasticity Steel after Friction Stir Welding

The Influence of the Tool Tilt Angle on the Heat Generation and the Material Behavior in Friction Stir Welding (FSW)

A Framework to Simulate Friction Stir Additive Manufacturing (FSAM) Using the Finite Element Method

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