Effect of welding parameters on microstructure and mechanical properties of friction stir welded 2219Al-T6 joints

Influences of tool traverse speed on tensile properties of air cooled and water cooled friction stir welded AA2519-T87 aluminium alloy joints

“…From the stress-strain diagram, it is observed that the bending strength is higher than the tensile strength. The higher bending strength of 523 MP is resulted for the face bend test of UWFSW-30 mm/min joint and 508 MPa is resulted for the root bend test of UWFSW- Zhang et al (2012) reported that quality of FSW joints can be fabricated at wide range of process parameters whereas the possibility of fabricating defect free UWFSW joints was difficult. The present study showed good agreement with the previous studies, in which higher number of defect free joint were produced under air cooling than the water cooling conditions within the selected levels of tool traverse speed.…”

Enhancing mechanical properties of friction stir welded 2219Al-T6 joints at high welding speed through water cooling and post-welding artificial ageing

“…Under the AC condition, Zhang et al [13] reported that sound FSW 2219Al-T6 joints could be obtained at lower rotational rates of 400-800 rpm and welding speeds of 100-800 mm/min, while higher rotational rates of 1200-1600 rpm easily led to tunnel and void defects. Under the WC condition, the investigated welding parameters and joint quality of the FSW 2219Al-T6 joints in the previous studies [12,14] and this study are summarized in Table 4.…”

“…For FSW precipitation-hardened (2xxx, 6xxx, and 7xxx) aluminium alloys, it has been generally reported that the heat-affected zone (HAZ) is the low hardness zone (LHZ) due to significant dissolution/coarsening of the precipitates during the FSW thermal cycle [7][8][9][10][11][12][13]. For the 2219Al-T6 alloy, although the FSW joints have been reported to have better joint efficiency compared to the fusion welded joints, the gap between the strength values of the base metal (BM) and the FSW joints is still large (N 25%) due to the softening problem of the HAZ [7][8][9].…”

“…Recently, Zhang et al [13] reported that sound FSW 2219Al-T6 joints could be obtained at a welding speed as high as 800 mm/min with a rotational rate of 800 rpm by adjusting the plunge depth, and the tensile strength of the FSW joints was further increased at 800 mm/min.…”

Influence of Friction Stir Welding on Mechanical Properties of Butt Joints of AZ61 Magnesium Alloy

“…In this study, the hardness value of SZs is similar to the hardness of the base material because there is no significant difference between grain size of SZs and grain size of base material (Figure 6(a)). On the other hand, according to some literatures [34][35][36][37] for FSWed aluminum alloy (2000, 6000 series), the hardness of SZs decreased about 20-45% compared with the hardness value of the base material. These results of hardness dropping imply that there is vulnerable to fracture at that location.…”