Influence of interfacial structure on the fracture behavior of friction stir spot welded dissimilar joints

Matsuda, Takeshi; Owada, Kiriko; Numata, Asahi; Shoji, Hiroto; Sano, Tomokazu; Ohata, Mitsuru; Hirose, Akio

doi:10.1016/j.msea.2019.138743

Cited by 24 publications

(6 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…FSSW was conducted using a pin with a Φ2 mm tip diameter at 3000 rpm. This parameter was referenced from that used in a previous study that conducted FSSW of an A6061 alloy and hot dip galvanized steel [ 26 , 31 ]. Figure 2 shows the welding force profile during the welding process.…”

Section: Methodsmentioning

confidence: 99%

“…In this study, the welding force was raised stepwise as shown in Figure 2 . For this profile, the setting value was also referenced from a previous study [ 26 ]. Since the galvannealed layer is harder than the galvanized layer, a slightly higher welding force was set in this study compared with that applied to the galvanized layer [ 26 ].…”

Section: Methodsmentioning

confidence: 99%

“…For this profile, the setting value was also referenced from a previous study [ 26 ]. Since the galvannealed layer is harder than the galvanized layer, a slightly higher welding force was set in this study compared with that applied to the galvanized layer [ 26 ]. From the feasibility study, in which both welding times of the first step and the second step shown in Figure 2 are 2 s, it was found that the tensile shear strength of the joint increases with an increase in the welding time of the third step and becomes the maximum at the total welding time of 10 s. Additionally, excess deformation of the A6061 alloy sheet was found when the total welding time was 12 s. Therefore, the total welding times were set to 9 and 10 s to investigate the mechanical properties of sound FSSW joints.…”

Section: Methodsmentioning

confidence: 99%

“…FSW is a reliable welding method and has advantages in that the method does not require additions such as rivets and, thus, in that the process cost can be reduced compared to that of SPR. In FSSW, the tool stirs the Al alloy and creates an active surface on the Al alloy, and thus, the Al alloy is joined to steel by hot joining with a welding force [ 25 , 26 ]. In FSSW, the heat generated in the welding interface is small compared to that of RSW, and thus, the growth of IMC formed in the welded interface can be restrained.…”

Section: Introductionmentioning

confidence: 99%

“…In FSSW, the heat generated in the welding interface is small compared to that of RSW, and thus, the growth of IMC formed in the welded interface can be restrained. For mechanical properties of FSSW joints, tensile shear load [ 25 , 27 ], cross tension load [ 25 , 27 ], and tensile strength of microscale specimens [ 26 , 28 ] have been investigated. However, there are a few reports of fatigue properties of FSSW joints for 5052 Al alloy and DP980-GA steel [ 3 ], 6061 Al alloy and SPCC steel [ 29 ], and 5052 Al alloy and SPC270C steel [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Microstructure and Fatigue Behaviors of Dissimilar A6061/Galvannealed Steel Joints Fabricated by Friction Stir Spot Welding

et al. 2021

View full text Add to dashboard Cite

The microstructures, tensile shear properties, and tensile shear fatigue properties of dissimilar A6061/Galvannealed steel joints fabricated by friction stir spot welding (FSSW) were investigated. Fe4Al13 phases form as the intermetallic compound (IMC) layer at the joint interface between the A6061 matrix and the galvannealed layer consisting of FeZn7, Fe, and Zn. At the edge of the joint, the stirred layer in which the A6061 matrix and the galvannealed layer are stirred also forms. Moreover, the solidified part of the residual melt discharged from the joint area forms at the outer peripheries of the joint. In this study, FSSW was conducted for two total welding durations: 9 and 10 s. Although the thickness of the remaining A6061 sheet in the welded area decreased with an increase in the welding time, the effects of the total welding time on tensile shear and tensile shear fatigue properties were negligible. A fatigue fracture occurred in the A6061 matrix and at the joint interface at the high cycle fatigue region and the low cycle fatigue region, respectively. In the case of the interfacial fracture, the crack was generated in the solidified part of the residual melt or at the interface between the solidified part and the stirred layer.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%