Tensile Properties and Microstructure of Friction Stir Welded Joints 2195-T8 Aluminum Alloy

No, Kookil; Lee, Ye Rim; Yoo, Joon Tae; Lee, Ho Sung

doi:10.4028/www.scientific.net/amm.835.191

Cited by 3 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tensile strength of 607.9 MPa was obtained for the base material. This result is comparative to the results from specimen without removing the surface oxide, which is reported earlier [4]. It is shown that by removing surface oxide before FSW, wider range of welding parameters can be obtained than that of the specimen welded without surface treatment.…”

Section: Resultssupporting

confidence: 50%

Effect of Rotating Tool Geometry on Mechanical Properties of Friction Stir Welded Aluminum Alloy 2195

Lee

Yoo

2018

KEM

Self Cite

View full text Add to dashboard Cite

It is known that Al-Li alloys show high specific strength and have been used in space vehicles with Friction stir welding (FSW). FSW has many advantages including the absence of porosity, low distortion and reduced residual stresses which are typical defects of the fusion welding processes. The process uses a rotating tool with a profiled pin that penetrates the parts to be welded. The tool starts to travel along the welding line and the softened material due to the frictional heat is stirred and mechanically mixed together by the rotating pin forming a weld in solid state without melting. Welding parameters such as tool rotational speed, travelling speed, and tool geometry are the main parameters which affect the material flow and the heat generation rate. The important tool geometry includes pin size and shape, pin tread and pitch, tool materials, and shoulder size and shape. The present work is to study the effect of tool geometry on the microstructure and mechanical properties of friction stir welded aluminum alloy 2195. Five different tool profiles have been used to investigate the effects of tool geometry on mechanical properties. The experimental results show that aluminum alloy 2195-T8 can be welded using FSW process with maximum welding efficiency of 75% using threaded cylindrical with concave shoulder at rotation speed, 600 RPM and welding speed, 300 mm/min.

show abstract

Section: Resultssupporting

confidence: 50%

Effect of Rotating Tool Geometry on Mechanical Properties of Friction Stir Welded Aluminum Alloy 2195

Lee

Yoo

2018

KEM

Self Cite

View full text Add to dashboard Cite

show abstract

“…Li et al [13] studied the precipitate phase in 2195 Al–Li alloy and discovered that the precipitates in the NZ are completely dissolved in FSW. Kookil et al [14] investigated the mechanical properties of AA2195-T8 joint and achieved the maximum welding efficiency of 81%. Zhang et al [15] have studied the influence of rotation speed on the mechanical properties of AA2195-T8 joints.…”

Section: Introductionmentioning

confidence: 99%

Analysis of heat and mass transfer in ultrasonic vibration-enhanced friction stir welding of 2195 Al–Li alloy

Shi

Chen

et al. 2021

Science and Technology of Welding and Joining

View full text Add to dashboard Cite

Ultrasonic vibration (UV)-enhanced friction stir welding (UVeFSW) is used for welding of 2195 Al-Li alloy plates. A model is developed to study the heat and mass transfer in UVeFSW of 2195 Al-Li alloy. It reveals that additional UV in FSW could reduce the heat flux and temperature at the contact interfaces when compared to those in conventional FSW. Although the temperature is slightly decreased with additional UV, the acoustoplastic effect of the UV could reduce the flow stress and viscosity in the shear zone, resulting in an enhanced fluidity of the plastic material with a higher flow velocity. It is demonstrated that the variations of viscosity, strain rate and flow stress around the tool at the same radial distance are more severe at low heat input condition, such as with a low rotation speed or a high welding speed. The model is validated by the experimental data.

show abstract

Study on the Optimization of the Tensile Properties of an Al-Li Alloy Friction Stir-Welding T-Joint

Qiu,

Zeng,

Meng

et al. 2024

Metals

View full text Add to dashboard Cite

The softening of aluminum–lithium alloy welded joints generally leads to a reduction in mechanical properties. In this study, a piece of 2A97-T3 aluminum–lithium alloy with a thickness of 2.8 mm was selected as the test material, and the tool and process used for wire-filled stationary shoulder friction stir welding (SSFSW) were developed. By increasing the bearing area of the softening zone, an equal-strength T-joint was manufactured. Good weld formation was obtained when the rotation speed was set to 2000 rpm and the welding speed ranged from 100 to 120 mm/min. The thickness of the softening zone was controlled by adjusting the reserved gap between the shoulder and the workpiece. The softening mechanism of the weld joint was revealed. The softening was attributed to the coarsening of the main precipitated phases (T1 and θ′ phases) in the heat-affected zone (HAZ) and the dissolution of precipitated phases in the thermo-mechanically affected zone (TMAZ). Grain refinement in the nugget zone (NZ) led to a certain fine-grained strengthening effect, although the precipitated phase was almost completely dissolved. Due to the thermal effect of second-pass welding, the hardness value of the NZ and HAZ in the center of the skin further decreased, and the minimum hardness was approximately 70% that of the base material. Tensile testing results indicated that the softening effect was largely offset by the increased bearing area of the softening zone, resulting in the successful welding of high-strength Al-Li alloy T-joints with equal strength. The strength coefficient was found to be 0.977.

show abstract

Tensile Properties and Microstructure of Friction Stir Welded Joints 2195-T8 Aluminum Alloy

Cited by 3 publications

References 8 publications

Effect of Rotating Tool Geometry on Mechanical Properties of Friction Stir Welded Aluminum Alloy 2195

Effect of Rotating Tool Geometry on Mechanical Properties of Friction Stir Welded Aluminum Alloy 2195

Analysis of heat and mass transfer in ultrasonic vibration-enhanced friction stir welding of 2195 Al–Li alloy

Study on the Optimization of the Tensile Properties of an Al-Li Alloy Friction Stir-Welding T-Joint

Contact Info

Product

Resources

About