A novel fed friction-stir (FFS) technology for nanocomposite joining

Derazkola, Hamed Aghajani; Khodabakhshi, F.

doi:10.1080/13621718.2019.1631534

Cited by 36 publications

(11 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the process, the tool extrudes the preheated material from the leading edge of the weld seam into the stir zone (SZ). The applied force for material flow is highly affected by tool tilt angle (TTA), which is an angle with negative position from forward transverse direction [20,21]. After passing the tool from SZ, the axial force causes the extruded material to fill the weld seam [22].…”

Section: Materials Flowmentioning

confidence: 99%

“…Three-dimensional observation of the joint area has indicated that the cross section consists of 4 main regions [23], that are schematically shown in Figure 6 passing the tool from SZ, the axial force causes the extruded material to fill the weld seam [22]. Threedimensional observation of the joint area has indicated that the cross section consists of 4 main regions [23], that are schematically shown in Figure 6: [20].…”

Section: Materials Flowmentioning

confidence: 99%

“…This also induces great temperature-dependent mechanical behavior variations. This is particularly important Formation of voids, flashes, and defects on the surface and internal parts of the joints are important issues in LFSW of polymers [20]. Micro and macro observations of the weld seam are indicative of the material flow produced [24].…”

Section: Materials Flowmentioning

confidence: 99%

See 2 more Smart Citations

Friction Stir Welding and Friction Spot Stir Welding Processes of Polymers—State of the Art

2020

Self Cite

View full text Add to dashboard Cite

In the last decade, the friction stir welding of polymers has been increasingly investigated by the means of more and more sophisticated approaches. Since the early studies, which were aimed at proving the feasibility of the process for polymers and identifying suitable processing windows, great improvements have been achieved. This owes to the increasing care of academic researchers and industrial demands. These improvements have their roots in the promising results from pioneer studies; however, they are also the fruits of the adoption of more comprehensive approaches and the multidisciplinary analyses of results. The introduction of instrumented machines has enabled the online measurement of processing loads and temperature, and critical understanding of the principal aspects affecting the material flow and welds quality. Such improvements are also clearly demonstrated by the increase of the strength of recent joints (up to 99% of joining efficiency) as compared to those reached in early researches (almost 47%). This article provides a comprehensive review of the recent progresses on the process fundamentals, quality assessment and the influence of process parameters on the mechanical behavior. In addition, emphasis is given to new developments and future perspectives.

show abstract

Section: Materials Flowmentioning

confidence: 99%

Section: Materials Flowmentioning

confidence: 99%

Section: Materials Flowmentioning

confidence: 99%

See 1 more Smart Citation

Friction Stir Welding and Friction Spot Stir Welding Processes of Polymers—State of the Art

2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Stiffness structures such as T-joints are an exciting topic for automobile and aerospace manufacturers [ 1 , 2 , 3 ]. Between metallic alloys, Al-Mg-Si significantly decreases engineering weight and improves the strength of structures [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of FSW Tool Plunge Depth on Properties of an Al-Mg-Si Alloy T-Joint: Thermomechanical Modeling and Experimental Evaluation

et al. 2021

Self Cite

View full text Add to dashboard Cite

One of the main challenging issues in friction stir welding (FSW) of stiffened structures is maximizing skin and flange mixing. Among the various parameters in FSW that can affect the quality of mixing between skin and flange is tool plunge depth (TPD). In this research, the effects of TPD during FSW of an Al-Mg-Si alloy T-joint are investigated. The computational fluid dynamics (CFD) method can help understand TPD effects on FSW of the T-joint structure. For this reason, the CFD method is employed in the simulation of heat generation, heat distribution, material flow, and defect formation during welding processes at various TPD. CFD is a powerful method that can simulate phenomena during the mixing of flange and skin that are hard to assess experimentally. For the evaluation of FSW joints, macrostructure visualization is carried out. Simulation results showed that at higher TPD, more frictional heat is generated and causes the formation of a bigger stir zone. The temperature distribution is antisymmetric to the welding line, and the concentration of heat on the advancing side (AS) is more than the retreating side (RS). Simulation results from viscosity changes and material velocity study on the stir zone indicated that the possibility of the formation of a tunnel defect on the skin–flange interface at the RS is very high. Material flow and defect formation are very sensitive to TPD. Low TPD creates internal defects with incomplete mixing of skin and flange, and high TPD forms surface flash. Higher TPD increases frictional heat and axial force that diminish the mixing of skin and flange in this joint. The optimum TPD was selected due to the best materials flow and final mechanical properties of joints.

show abstract

“…In 1991 at TWI, friction stir welding (FSW), a solid-state joining process was invented [ 5 , 6 , 7 , 8 ]. High quality, efficiency, environmental protection, and energy-saving are guaranteed in this method [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Rapid Cooling on Properties of Aluminum-Steel Friction Stir Welded Joint

et al. 2021

Self Cite

View full text Add to dashboard Cite

In this study, dissimilar sheets including AA3003 aluminum and A441 AISI steel were welded via cooling-assisted friction stir welding (FSW). Three different cooling mediums including forced CO2, forced water, and forced air were employed, and a non-cooled sample was processed to compare the cooling-assisted condition with the traditional FSW condition. The highest cooling rate belongs to CO2 and the lowest cooling rate belongs to the non-cooled sample as FSW. The best macrograph without any segregation at interface belongs to the water-cooled sample and the poorest joint with notable segregation belongs to the CO2 cooling FSW sample. The CO2 cooling FSW sample exhibits the smallest grain size due to the suppression of grain growth during dynamic recrystallization (DRX). The intermetallic compound (IMC) thickening was suppressed by a higher cooling rate in CO2 cooling sample and just Al-rich phase was formed in this joint. The lowest cooling rate in the FSW sample exhibits formation of the Fe rich phase. The IMC layers were thicker at the top of the weld due to closeness with the heat generation source. The water cooling sample exhibits the highest tensile strength due to proper mechanical bonding simultaneously with optimum IMC thickness to provide appropriate metallurgical bonding. Fractography observation indicates that there is a semi-ductile fracture in the water cooling sample and CO2 cooling sample exhibits more brittle fracture. Hardness evaluation reveals that the higher the cooling rate formed, the higher the hardness in stir zone, and hardness changes in the aluminum side were higher than the steel side.

show abstract

A novel fed friction-stir (FFS) technology for nanocomposite joining

Cited by 36 publications

References 38 publications

Friction Stir Welding and Friction Spot Stir Welding Processes of Polymers—State of the Art

Friction Stir Welding and Friction Spot Stir Welding Processes of Polymers—State of the Art

Effects of FSW Tool Plunge Depth on Properties of an Al-Mg-Si Alloy T-Joint: Thermomechanical Modeling and Experimental Evaluation

Effects of Rapid Cooling on Properties of Aluminum-Steel Friction Stir Welded Joint

Contact Info

Product

Resources

About