scholarly journals Effect of Applied Pressure on the Mechanical Properties of 6061 Aluminum Alloy Welded Joints Prepared by Friction Stir Welding

2017 ◽  
Vol 7 (3) ◽  
pp. 1619-1622
Author(s):  
J. A. Al-jarrah ◽  
A. Ibrahim ◽  
S. Sawlaha
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Axial Force ◽  
Welded Joints ◽  
Applied Pressure ◽  
Base Material ◽  
Surface Appearance ◽  
6061 Aluminum Alloy ◽  
Friction Stir

This paper investigates the effect of axial force on the surface appearance and mechanical properties of 6061 aluminum alloy welded joints prepared by friction stir welding. The applied pressure varies from 1.44 to 10.07 MPa. The applied pressure was calculated from the axial force which exerted by a spring loaded cell designed for this purpose. Defect free joints obtained at an applied pressure of 3.62 MPa. The mechanical properties of the welded joints were evaluated through microhardness and tensile tests at room temperature. From this investigation, it was found that the joint produced with an applied pressure of 5.76 MPa exhibits superior tensile strength compared to other welded joints. The fracture of this joint happened at the base material.

Microhardness and Microstructural Studies on Underwater Friction Stir Welding of 5052 Aluminum Alloy

2017 ◽  
Author(s):  
Srinivasa Rao Pedapati ◽  
Dhanis Paramaguru ◽  
Mokhtar Awang
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Plate Thickness ◽  
Base Material ◽  
Friction Stir ◽  
Underwater Friction Stir Welding ◽  
Void Area ◽  
Average Size ◽  
Microstructural Studies

As compared to normal Friction Stir Welding (FSW) joints, the Underwater Friction Stir Welding (UFSW) has been reported to be obtainable in consideration of enhancement in mechanical properties. A 5052-Aluminum Alloy welded joints using UFSW method with plate thickness of 6 mm were investigated, in turn to interpret the fundamental justification for enhancement in mechanical properties of material through UFSW. Differences in microstructural features and mechanical properties of the joints were examined and discussed in detail. The results indicate that underwater FSW has reported lower hardness value in the HAZ and higher hardness value in the intermediate of stir zone (SZ). The average hardness value of underwater FSW increases about 53% greater than its base material (BM), while 21% greater than the normal FSW. The maximum micro-hardness value was three times greater than its base material (BM), and the mechanical properties of underwater FSW joint is increased compared to the normal FSW joint. Besides, the evaluated void-area fraction division in the SZ of underwater FSW joint was reduced and about one-third of the base material (BM). The approximately estimated average size of the voids in SZ of underwater FSW also was reduced to as low as 0.00073 mm2, when compared to normal FSW and BM with approximately estimated average voids size of 0.0024 mm2 and 0.0039 mm2, simultaneously.

scholarly journals Investigation of Microstructure and Mechanical Properties of Welded Joints of Aluminum Alloys Welded with Titanium Based Powder Material by High Velocity Oxygen Fuel Spray Method (HVOF) Combined with Friction Stir Welding Method

2018 ◽  
Vol 1 (1) ◽  
pp. 558-564
Author(s):  
Hüseyin Köken ◽  
Hasan Kaya ◽  
Ramazan Samur ◽  
Mehmet Uçar
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Powder Material ◽  
Welded Joints ◽  
High Velocity ◽  
High Velocity Oxygen Fuel ◽  
Friction Stir ◽  
Aluminum Plates ◽  
Oxygen Fuel

In this study, spectral analyzes were performed to determine the chemical composition of the samples at 2x40x40 mm taken from aluminum alloy sheet materials. Plates to be combined with friction stir welding were mechanically cut with guillotine scissors at 2x100x300mm. The welded joints of the aluminum plates to be friction-mixed are coated with titanium-based powder material with a thickness of 40µm by high velocity oxygen fuel spraying (HVOF) method. A friction stir tool with a cone tip geometry with machining, 20mm shoulder diameter and 1.8mm pin height was produced for use in the friction stir welding process. In addition, the aluminum alloy sheets prepared were machined according to ASTM E8M-04 standard with dimensions of 2x100x300mm so that they could be joined with friction stir welding on the milling bench. Waterjet drawing and metallographic samples were cut from welded aluminum plates formed with parameters of 2000 rpm rotation speed and 140 mm / min welding speed and 2 degree head angle in accordance with ASTM E8M-04 standard. Tensile specimens were measured on the universal drafting table at a pulling speed of 2 mm / min along with the maximum tensile breaking values ??as well as percent elongation. In order to determine the microstructure and mechanical properties of the weld inserts, hot stamping of the samples, which were not affected by heat, was followed by coarse and fine sanding followed by final polishing with 1µm diamond paste. The hardness values of the samples were determined by Vickers hardness measurement along an axis to characterize the welded zone upper, middle and lower zones to cover all weld zones and the main material.

Effect of Pre and Post Weld Heat Treatment on the Mechanical Properties of Friction Stir Welded AA6061-T6 Joint

2020 ◽  
Vol 17 (2) ◽  
pp. 7882-7889 ◽  
Author(s):  
J.C. Verduzco Huarez ◽  
R. Garcia Hernandez ◽  
G. M. Dominguez Almaraz ◽  
J.J. Villalón López
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Research Work ◽  
Base Material ◽  
Welding Process ◽  
Post Weld Heat Treatment ◽  
Friction Stir

This research work focuses on the study of the improvement of mechanical properties, specifically the tensile strength of 6061-T6 aluminum alloy on prismatic specimens with 9.5 mm thickness that has been subjected to friction stir welding process and two heat treatments; solubilized and aging before or after the welding process. Three cases studied and evaluated were, welding of the base material without heat treatment (BMW), solubilized heat treatment and partial aging of the base material before welding (HTBW), and heat treatment of solubilized and aging of the base material after welding (HTAW). The obtained results show an increase of about 10% (20 MPa) of tensile strength for the HTBW process, compared to BMW case. In addition, for the case of HTAW, the obtained tensile resistance presents a joint efficiency of 96%, which is close to the tensile strength of the base material (»310 MPa).

Effect of tool feed on mechanical properties of butt joints during friction welding with mixing of aluminum alloys

2020 ◽  
pp. 65-70
Author(s):  
A.N. Feofanov ◽  
V.V. Ovchinnikov ◽  
A.M. Gubin
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Aluminum Alloys ◽  
Friction Welding ◽  
Base Material ◽  
Butt Joints ◽  
Structure Defects ◽  
Friction Stir ◽  
Time Parameters

Friction stir welding of butt joints of aluminum alloys is considered. It is experimentally determined, that when temperature and time parameters are violated, defects in the form of discontinuities are localized at the boundary of the weld and the base metal, due to incompatibility of deformations of the weld metal and the adjacent base material. Keywords friction welding with stirring, aluminum alloy, mode parameters, structure, defects, strength. [email protected]

Intergranular corrosion susceptibility of 6061 aluminum alloy welded joints

2021 ◽  
Vol 112 (8) ◽  
pp. 610-616
Author(s):  
Lihua Gong ◽  
Weimin Guo ◽  
Yang Li
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Welded Joints ◽  
Intergranular Corrosion ◽  
Inert Gas ◽  
6061 Aluminum Alloy ◽  
Friction Stir ◽  
Melted Zone ◽  
Metal Inert Gas Welding ◽  
Welding Joints

Abstract The intergranular corrosion behavior of 6061 aluminum alloy welded joints produced by metal inert gas welding and friction stir welding was studied. The microstructure of the welded joints and the intergranular corrosion morphology of the cross-section were analyzed by optical microscopy. The results show that the most sensitive area of intergranular corrosion is the partially melted zone of the metal inert gas welding, and the maximum corrosion depth is about seven times that of the base metal, followed by the unmixed zone. The heat affected zone has the lowest sensitivity. Although the welding seam corroded seriously, general corrosion played a leading role. With the high heat input of metal inert gas welding, the sensitivity to intergranular corrosion in the partially melted zone increased significantly, while other zones had little change. For friction stir welding joints, the heat affected zone suffered from the most severe corrosion, and the nugget zone the least. However, the difference is not apparent. The susceptibility to intergranular corrosion of friction stir welding joints is weaker than that of metal inert gas welding joints but more severe than the base metal.

scholarly journals Assessment of Microstructure and Mechanical Properties of Friction Stir Welded AA2014-O and AA2014-T6 Sheets

2021 ◽  
Author(s):  
Wali Muhammad ◽  
Wilayat Husain ◽  
Anjum Tauqir ◽  
Abdul Wadood ◽  
Hamid Zaigham ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Mechanical Behavior ◽  
Ductile Fracture ◽  
Base Metal ◽  
Weld Joint ◽  
Welded Joints ◽  
Strong Influence ◽  
Friction Stir

Abstract In this study, friction stir welding of AA2014-O and AA2014-T6 aluminum alloy was performed at various welding speeds to evaluate the influence of temper conditions of base metal on the properties of the welded joints. The results showed strong influence of base metal temper conditions on the microstructural morphologies and mechanical behavior of the welded joints. In the 2014-O joints, different zones of weld joint were diffused into each other and there was no clear interface between them. In 2014-T6 joints, there was a distinct demarcation between the NZ, TMAZ, HAZ and base metal. The welded joints in 2014-O temper condition showed increase in hardness in the vicinity of weld center due to grain refinement whereas, in 2014-T6, softening occurred in the same region by the dissolution of strengthening precipitates. The mechanical properties of 2014-O joints were equivalent to the base metal showing a 100% weld efficiency with fracture located in the base metal, whereas 2014-T6 welds exhibited about 70% weld efficiency with fracture located at the NZ/TMAZ interface. All the samples in mechanical testing fractured at retreating side (RS) which exhibited heterogeneity in the mechanical properties of the welded joints. SEM fractographic analysis revealed a ductile fracture mode comprising of dimples in both temper conditions. The size and shape of the dimples was strongly dependent on base metal temper condition.

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