Structure-Property Correlation of AA2014 Friction Stir Welds: Role of Tool Pin Profile

Ramanjaneyulu, K.; Reddy, G. Madhusudhan; Rao, A. Venugopal; Markandeya, R.

doi:10.1007/s11665-013-0512-4

Cited by 74 publications

(53 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The tools with non-circular pin profiles were recently used for FSW with an aim to enhance the flow of the plasticized material and the resulting joint quality [6,7]. The pins with the regular polygonal shapes, such as triangular [8e12], square [13e20], and hexagon [21], and the complex profiles, such as triangular with a convex periphery, circular with three flats, three flutes and four flutes, which are referred to as trivex, triflat, triflute and quadflute, respectively, are considered [6,7,10]. The pin profiles with the regular polygon shape are preferred in comparison to the complex non-circular shapes because of the ease of manufacturing of the former ones.…”

Section: Introductionmentioning

confidence: 99%

“…The tool pins with square cross-section provided the best mechanical properties of weld joint for a range of welding conditions in FSW of SiC reinforced AA1050 [13], AA6061 [14] and [15], Al-10 wt.% TiB 2 MMC [16], AA2219 [19] and [20], and in dissimilar materials of AA5083 and AA6351 [18] compared to the other pin profiles. Amongst the pins with several polygonal cross-sections, a typical hexagonal pin profile provided superior tensile properties of weld joint in FSW of AA2014 although the joint properties obtained with the square, pentagon and hexagonal pins did not show any significant variation [21]. Most of these studies on FSW with polygonal pin profiles concentrated on the testing and characterization of the final weld joints.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical modeling of friction stir welding using the tools with polygonal pins

Mehta¹,

Reddy

Rao

et al. 2015

Defence Technology

View full text Add to dashboard Cite

Friction stir welding using the tools with polygonal pins is often found to improve the mechanical strength of weld joint in comparison to the tools with circular pins. However, the impacts of pin profile on the peak temperature, tool torque and traverse force, and the resultant mechanical stresses experienced by the tool have been rarely reported in a systematic manner. An estimation of the rate of heat generation for the tools with polygonal pins is challenging due to their non-axisymmetric cross-section about the tool axis. A novel methodology is presented to analytically estimate the rate of heat generation for the tools with polygonal pins. A three-dimensional heat transfer analysis of friction stir welding is carried out using finite element method. The computed temperature field from the heat transfer model is used to estimate the torque, traverse force and the mechanical stresses experienced by regular triangular, square, pentagon and hexagon pins following the principles of solid mechanics. The computed results show that the peak temperature experienced by the tool pin increases with the number of pin sides. However, the resultant maximum shear stress experienced by the pin reduces from the triangular to hexagonal pins.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical modeling of friction stir welding using the tools with polygonal pins

Mehta¹,

Reddy

Rao

et al. 2015

Defence Technology

View full text Add to dashboard Cite

show abstract

“…As the number of flat faces increase, the amount of material around the rotating pin decreases. This clearly improves weld quality on TMAZ (Elangovan and Balasubramanian 2008;Ramanjaneyulu et al 2013;Vijay and Murugan 2010). Hence, the weld joints fabricated by tools equipped with square pins have higher UTS and TE, whereas the cylindrical and taper pins have no such pulsating effect.…”

Section: Effects Of Rotational Speedmentioning

confidence: 93%

Tensile Properties Improvement on Friction Stir Welded Age-Hardenable Aluminum Alloys: An Evolutionary Approach using RSM based GA and SA

2016

Rev. Téc. Ing. Univ. Zulia.

View full text Add to dashboard Cite

AA2024 and AA6061 aluminum alloys were fabricated using the friction stir welding technique to improve the tensile properties such as ultimate tensile strength (UTS) and tensile elongation (TE). The BoxBehnken design matrix with four significant factors-rotational speed (X(1)), welding speed (X(2)), axial load (X(3)), and pin shape (X(4)), each having three levels-was used with response surface methodology to develop a mathematical model. The experiments yielded ultimate tensile strength of 141 MPa at 12% tensile elongation. The obtained tensile properties of fabricated weld joints were low when compared to those of base materials. Several voids and pinholes were found, these being the consequence of poor tensile properties on the fabricated weld joints. Therefore, to maximize the tensile properties, two computational approaches were employed: a genetic algorithm and a simulated annealing algorithm. The main objectives of applying these computational approaches were: (1) to maximize the UTS and TE compared to the welding performance value of the experimental data and regression modeling; (2) to estimate the optimal process parameter values that must be within the obtained range of the minimum and maximum values; and (3) to evaluate the number of iterations generated by the computational approaches. The results show that use of the computational approaches resulted in significant improvement in the tensile properties. Comparing the genetic algorithm with the simulated annealing algorithm, the latter maximizes the tensile properties of fabricated AA2024 and AA6061 aluminum alloy weld joints; however, a considerable number of iterations and substantial amount of time was required to achieve a global optimal solution.

show abstract

“…The pin profile is a parameter which plays important role during the FSW process, affecting the welding temperature, plastic deformation, the material mixing, the grain size, the welding defects, and so forth [20][21][22]. Some different pin profiles have been used to investigate their effects on the mechanical properties of welded materials using FSW [23][24][25]. Furthermore, recent investigations are oriented to the determination of the physical and mechanical effects of pin profiles: a model has been proposed for a taped cylindrical pin profile [22], which proposes equations for the heat generation: (a) from the shoulder surface, (b) from the taper probe surface, and (c) from the pin tip surface.…”

Section: Introductionmentioning

confidence: 99%

Effect of Modified Pin Profile and Process Parameters on the Friction Stir Welding of Aluminum Alloy 6061-T6

Juárez

Almaraz

Hernández

et al. 2016

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

This work deals with the effect of a new “bolt-head” pin profile on the friction stir welding performance of the aluminum alloy 6061-T6, compared to traditional pin profiles. Friction stir welding parameters such as the tool rotation speed and the welding speed were investigated together with the different pin profiles; the results show that the new “bolt-head” pin profile leads to better mechanical properties of welded specimens. The pin profiles used in this work were the straight square (SS), straight hexagon (SH), taper cylindrical (TC), and the straight hexagon “bolt-head” (SHBH). It was found that the last pin profile improves the material flow behavior and the uniform distribution of plastic deformation and reduces the formation of macroscopic defects on the welded zone. Mechanical tensile tests on welded specimens were performed to determine the tensile strength: the specimens welded with the SHBH pin profile have shown the highest mechanical properties. An approach is presented for material flow on this aluminum alloy using the SHBH pin profile, which is related to the improvement on the resulting mechanical properties.

show abstract

Structure-Property Correlation of AA2014 Friction Stir Welds: Role of Tool Pin Profile

Cited by 74 publications

References 35 publications

Numerical modeling of friction stir welding using the tools with polygonal pins

Numerical modeling of friction stir welding using the tools with polygonal pins

Tensile Properties Improvement on Friction Stir Welded Age-Hardenable Aluminum Alloys: An Evolutionary Approach using RSM based GA and SA

Effect of Modified Pin Profile and Process Parameters on the Friction Stir Welding of Aluminum Alloy 6061-T6

Contact Info

Product

Resources

About