Temperature Monitoring and Material Flow Characteristics of Friction Stir Welded 2A14-t6 Aerospace Aluminum Alloy

Tang, Wu; Zhao, Fei; Luo, Haitao; Wang, Haonan; Li, Yuxin

doi:10.3390/ma12203387

Cited by 26 publications

(14 citation statements)

References 42 publications

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“…They further reported that induction of ultrasonic vibrations during welding improved material flow in the pin affected zone and aided in the elimination of tunnel defect. The occurrence of these zones was reaffirmed by Wu et al 45 in their recent study. The downward movement of shoulder driven flow and its convergence with the pin driven flow is observed in weld macrographs of Figure 5.…”

Section: Resultssupporting

confidence: 55%

Understanding the effect of tool geometrical aspects on intensity of mixing and void formation in friction stir process

Malik

Kailas

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The reduction of agglomeration of particulate reinforcement in friction stir processing and elimination of joint line remnant in friction stir welding depends on stirring ability of friction stir tool. The magnitude of stirring is indicated by the intensity of material inter-mixing in tool interacted region. Present investigations analyse the influence of geometrical aspects of classical friction stir tool on the intensity of material intermixing, location of high stir regions and void formation during the steady-state phase of friction stir welding. The classical tool was chosen as its geometrical features undergo minimal wear in the harsher processing environment. Investigating material mixing using metallic inserts have their shortcomings due to different flow properties of insert/marker and parent material. Therefore, bi-colour plasticine configuration possessing primary colours was adopted to understand the level of intermixing. The hue attribute of the generated secondary colour was utilised to identify and quantify material mixing. Experimental results revealed that the pin diameter positively influenced mixing and negatively affected void formation. Shoulder size and pin taper angle aided in the closure of void with inferior mixing. The intensity of mixing enhances on selection of tools possessing a shoulder to pin diameter ratio of 2.5. Finite element simulation studies were conducted to understand the reasons for mixing under certain tooling conditions. Since material subjected to stirring is concentrated primarily on a portion of advancing side, components of shear strain, shear strain rates, shear stress and velocity were tracked for this portion of processed material during its interaction with tool pin for one complete rotation.

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Section: Resultssupporting

confidence: 55%

Understanding the effect of tool geometrical aspects on intensity of mixing and void formation in friction stir process

Malik

Kailas

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…al. [25,26]. Furthermore, both curves are located in the diffusion-controlled transformation zone for Ti6Al4V extending from 800° C-995° C (striped area), what leads to the assumption that lamellar α-and β-titan will be present in the resulting microstructure for both joints with varying volume content.…”

Section: Process Behaviormentioning

confidence: 99%

Comparison of process behavior, microstructure and mechanical properties of ultrasound enhanced friction stir welded titanium/titanium joints

2022

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Titanium as a high-performance material offers great potential for a wide range of applications with different aspects like lightweight-constructions, biocompatibility as well as design and is used in various industrial areas like the transportation sector or in medical and sports engineering. To exploit the full potential of titanium, there is still a need for innovative and efficient joining techniques compared to conventional methods. The process of friction stir welding as a solid-state joining method is able to produce high-quality similar joints of titanium. Nevertheless, there are still some challenging aspects when friction stir welding titanium like the formation of oxide layers that affect the mechanical properties especially in the field of fatigue negatively. The superposition of power ultrasound on the friction stir welding process can address this issue. Therefore, the hybrid process of ultrasound enhanced friction stir welding was applied on similar Ti6Al4V/Ti6Al4V joints in a butt joint configuration to reduce the amount of oxide layers and improve the fatigue lifetime of the joints. For the joint configuration, a positive impact of the power ultrasound could be identified by the breakup of oxide layers and an increase in the tensile strength of 16%. Also stepwise load increase tests revealed a higher estimated fatigue strength for ultrasound enhanced friction stir welded specimen in this butt joint configuration.

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“…The

, and

represent the mean velocity in x , y , and z directions. On the other hand, the

, and

are the turbulent fluctuation that are calculated by [ 34 , 35 ]:

…”

Section: Process Modellingmentioning

confidence: 99%

Effects of Underwater Friction Stir Welding Heat Generation on Residual Stress of AA6068-T6 Aluminum Alloy

et al. 2022

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This article aims to study water-cooling effects on residual stress friction stir welding (FSW) of AA6068-T6 aluminum alloy. For this reason, the FSW and submerged FSW processes are simulated by computational fluid dynamic (CFD) method to study heat generation. The increment hole drilling technique was used to measure the residual stress of welded samples. The simulation results show that materials softening during the FSW process are more than submerged. This phenomenon caused the residual stress of the joint line in the submerged case to be lower than in the regular FSW joint. On the other hand, the results revealed that the maximum residual stresses in both cases are below the yielding strength of the AA6068-T6 aluminum alloy. The results indicated that the residual stress along the longitudinal direction of the joint line is much larger than the transverse direction in both samples.

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Temperature Monitoring and Material Flow Characteristics of Friction Stir Welded 2A14-t6 Aerospace Aluminum Alloy

Cited by 26 publications

References 42 publications

Understanding the effect of tool geometrical aspects on intensity of mixing and void formation in friction stir process

Understanding the effect of tool geometrical aspects on intensity of mixing and void formation in friction stir process

Comparison of process behavior, microstructure and mechanical properties of ultrasound enhanced friction stir welded titanium/titanium joints

Effects of Underwater Friction Stir Welding Heat Generation on Residual Stress of AA6068-T6 Aluminum Alloy

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