An Experimental Study of Rolled Friction-Stir-Welded Aluminum 6061-T6 Joints Subjected to Static and Fatigue Loading Conditions

Hassanifard, Soran; Reyhani, H. A.; Nabavi-Kivi, A.; Varvani‐Farahani, A.

doi:10.1007/s11665-020-04949-w

Cited by 2 publications

(3 citation statements)

References 34 publications

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“…The addition of 2.5 wt.% alumina particles in the stirred zone of FSSW joints adversely affected the fatigue The higher temperature of rolling in in situ rolled joints reduced defects on the weld region over the rolling process. However, micrographs of sequential rolled joints holding worm-hole defects [27] resulted in lower fatigue life of sequentially rolled FSW joints. In contrast, the finer particle dispersion and smaller grain size formed in in situ rolled joints improved the fatigue lives of aluminum joints noticeably.…”

Section: Fatigue Life Of Heat-treated Fsw Jointsmentioning

confidence: 99%

“…The in situ/sequential rolling operation on FSW joints was discussed in detail in Ref. [27]. The rolling tool shape and geometry as well as the rolled joint are presented in Figure 1.…”

Section: Cold Working Processesmentioning

confidence: 99%

“…It was observed that following the in situ rolling process, the fracture position in rolled samples moved from the HAZ to the SZ. This could be associated with decreased grain size within the HAZ due to the rolling operation [27]. The failure of LPBed samples, on the other hand, took place at different sites.…”

Section: Fatigue Life Of Cold Worked Samplesmentioning

confidence: 99%

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A Comparative Study on Fatigue Response of Aluminum Alloy Friction Stir Welded Joints at Various Post-Processing and Treatments

Hassanifard

Varvani‐Farahani

2021

JMMP

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The present study examines the fatigue of friction stir welded (FSW) aluminum 6061, 7075, 1060 joints followed by (i) in situ and sequential rolling (SR) processes, (ii) plastic burnishing (iii) solution-treatment artificial aging (STA), (iv) local alloying through depositing thin copper foils, and (v) inserting alumina powder in the weld nugget zone (NZ). The microstructural features and fatigue life of post-processed joints were compared with those of as-welded joints. The in situ rolling technique offered simultaneous rolling and welding operations of aluminum joints, while through the sequential rolling process, the top surface of FSW joints was rolled after the welding process. The fatigue life of in situ rolled samples was increased as the ball diameter of welding tool increased. The fatigue life of friction stir welded joints after a low-plasticity burnishing process was noticeably promoted. The addition of 1 wt.% alumina in the NZ of joints resulted in a significant elevation on fatigue life of friction stir spot welded joints, while an increase in alumina powder to 2.5 wt.% adversely affected fatigue strength. Weld NZ was alloyed through the insertion of copper foils between the faying surfaces of joints. This localized alloy slightly improved the fatigue life of joints; however, its effects on fatigue life were not as influential as STA heat-treated or in situ rolled joints. The microstructure of weld joints was highly affected through post-processing and treatments, resulting in a substantial influence on the fatigue response of FSW aluminum joints.

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Section: Fatigue Life Of Heat-treated Fsw Jointsmentioning

confidence: 99%

“…The in situ/sequential rolling operation on FSW joints was discussed in detail in Ref. [27]. The rolling tool shape and geometry as well as the rolled joint are presented in Figure 1.…”

Section: Cold Working Processesmentioning

confidence: 99%