Impact of process parameters during friction stir welding of AZ80A Mg alloy

Sevvel, P.; Jaiganesh, V.

doi:10.1179/1362171815y.0000000068

Cited by 28 publications

(17 citation statements)

References 21 publications

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“…One important reason for the above-mentioned tensile-strength values is that the larger input of heat values (arising due to higher values of the rotational speed) must have resulted in the increase of the grain size followed by a simultaneous disintegration of the massive intermetallic Al 12 Mg 17 precipitates in the AZ80A Mg FSW zone. 15,16 Apart from this, it is already proven that higher tool-rotational speeds result in an enormous amount of heat input, which immediately leads to an uncontrollable turbulence of the plasticized materials in the FSW zone and eventually results in the generation of defects in the joints. 17 Hence, it can be summarized that the increase in the speed of rotation of the FSW tool initially results in an increase in the tensile strength, eventually declining with further increase in the rotational speed.…”

Section: Tensile Strength and A Fractography Analysismentioning

confidence: 99%

Role of tool rotational speed in influencing microstructural evolution, residual-stress formation and tensile properties of friction-stir welded AZ80A Mg alloy

Sevvel¹,

Satheesh²

2018

Mater. Tehnol.

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Joining flat plates of the AZ80A Mg alloy was carried out using the friction-stir-welding technique, employing various speeds of rotation (the tool), and it was observed that an M-shaped distribution characterizes the stress (residual) distributed in the longitudinal direction. Apart from this, the longitudinal stress (tensile) on the advancing side (AS) was found to be larger than that on the retreating side (RS) in the stir zone. It was experimentally recorded that there seem to be a slight increase in the stress values (tensile longitudinal residual), an increase in the tool rotational speed, and an increase in the peak tensile longitudinal stresses at the edge of the shoulder on the AS of the joints. The grain structures in the stir zone were also found to be influenced by the speed of the tool. Observations of fracture surfaces indicated that dimples and ridges resulted in a ductile fracture and quasi-cleavage resulted in a brittle fracture.

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Section: Tensile Strength and A Fractography Analysismentioning

confidence: 99%

Role of tool rotational speed in influencing microstructural evolution, residual-stress formation and tensile properties of friction-stir welded AZ80A Mg alloy

Sevvel¹,

Satheesh²

2018

Mater. Tehnol.

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“…In order to obtain high-quality welded joints, some new welding technologies have been developed in recent years, which have well solved the welding difficulties of magnesium alloys. Welding technologies have been reported including tungsten insert gas (TIG) arc welding [5,6], electron beam welding (EBW) [7,8], laser beam welding (LBW) [9,10], friction stir welding (FSW) [11,12]. Owing to its adaptability, stability and economy, TIG welding has become a common technology used for welding magnesium alloys [13].…”

Section: Introductionmentioning

confidence: 99%

Research for microstructure and mechanical properties of AZ91 magnesium alloy welded joint with magnetic field and activated flux

Zhang

Ren

2020

Mater. Res. Express

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Although many experimental researches have been carried out on the effect of different fluxes and the mechanism responsible for the higher penetration in activated TIG welding of magnesium alloy, few works as reported in literatures are available concering the grain refinement and the improvement of mechanical properties of welding joints. This is because the activated flux has very limited or even negative effects on improving the mechanical properties of welded joints. In order to find a method that can improve welding efficiency and mechanical properties of welded joints, the longitudinal alternating magnetic field and NiCl 2 activated flux were used during TIG welding of AZ91 magnesium alloy. The formation, mechanical properties, phase composition and crystal growth pattern of the weld seam were tested and analyzed to study the mechanism. The experimental results reveal that with proper parameter matching (magnetic field and activated flux), larger weld penetration and smaller form factor can be obtained, welding efficiency is improved accordingly, but the form factor with the magnetic field is bigger than that without magnetic field. When the activated flux amount is 3 mg cm −2 with the magnetic field, the optimal value of mechanical properties of welded joint is obtained, tensile strength is 385 MPa, elongation is 13.3%, micohardness is 67 HV, respectively. All of these are better than those without the magnetic field, the optimal activated flux amount is 2 mg cm −2 . The application of magnetic field and activated flux has no noticeable effect on the phase composition of weld seam. Under the combined action of magnetic field and activated flux, the crystallization nucleation condition of molten pool was changed, the grain size was refined, the formation of twins was promoted, and the crystals selectively grew within the basal (0001) plane.

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“…Apart from this, this FSW tool also leads to plastic deformation at the location of the joints, thereby enabling the joining of the parent metals, even when they are in the solid state. These reasons make this FSW technique a preferable one for many alloys in the recent years, when compared with that of the other conventional joining techniques [11,12].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the improvement of the properties of the AZ80A Mg alloy joints using friction stir welding process

Sevvel¹,

Mahadevan²,

Sateš³

et al. 2019

FME Transactions

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An experimental investigation was conducted with the basic objective of demonstrating the feasibility of joining the AZ80A Mg alloys using the technique of friction stir welding (FSW). Good quality joints free from defects were obtained for 5mm thickness AZ80A Mg alloy flat plates at a speed of rotation of 750 rpm with a traversing speed of 1.5 mm/min, by employing a FSW tool fabricated out of M35 grade High Speed Steel(HSS). It was experimetally observed that, the nugget zone (NZ) of the defect free weldments were found with fine sized, equally spaced & uniformly distributed grains when compared with that of the parent metal. Apart from this, the heat affected zone (HAZ) lying beside the NZ was found to possess larger sized near equaxied grains due to the effect of annealing. The weld zones were found to possess regions of slight softening nature when compared to that of the parent metal, arising from the dislocation of the lower densities. Moreover, the tensile strength of the defect free weldments was found to be around 78% of the parent metal, which seems to better than that of the strengths obtained using conventional joining techniques.

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Impact of process parameters during friction stir welding of AZ80A Mg alloy

Cited by 28 publications

References 21 publications

Role of tool rotational speed in influencing microstructural evolution, residual-stress formation and tensile properties of friction-stir welded AZ80A Mg alloy

Role of tool rotational speed in influencing microstructural evolution, residual-stress formation and tensile properties of friction-stir welded AZ80A Mg alloy

Research for microstructure and mechanical properties of AZ91 magnesium alloy welded joint with magnetic field and activated flux

Experimental investigation on the improvement of the properties of the AZ80A Mg alloy joints using friction stir welding process

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