Weld tool travel speed effects on fatigue life of friction stir welds in 5083 aluminium

James, M.N.

doi:10.1016/s0142-1123(03)00061-6

Cited by 109 publications

(69 citation statements)

References 4 publications

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“…The straight crack at right angles to the stress axis, observed for the longitudinal weld sample, certainly reflects a contribution of the weld grooves in fracture. In fact, surface roughness is a function of the FSW tooling design and the welding parameters and can seriously compromise the plastic and fatigue behaviour of the welds [3,35]. In present study, surface grooves did not influence the global ductility of the longitudinal or transverse samples.…”

Section: Leitao Et Al / Materials and Design XXX (2008) Xxx-xxxcontrasting

confidence: 42%

Mechanical behaviour of similar and dissimilar AA5182-H111 and AA6016-T4 thin friction stir welds

et al. 2009

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a b s t r a c tThe tensile behaviour of similar and dissimilar friction stir welds in 1 mm thick sheets of two aluminium alloys (AA5182-H111 and AA6016-T4) is analysed in this paper. The heterogeneity in properties across the welds was studied by performing microhardness tests and microstructural analysis. The tensile tests were performed in samples extracted longitudinal and transverse to the weld direction. It was found that the tensile behaviour of the welds depends mainly on the grain size in the TMAZ, for the AA5182-H111 alloy, and on precipitate distribution, for the AA6016-T4 alloy. In all types of welds, the HAZ preserves the same properties of the base materials. The global mechanical behaviour of the AA5182-H111 similar welds is very similar to that of the base material. However, for the AA6016-T4 similar welds and for the AA6016-T4-AA5182-H111 dissimilar welds a 10-20% strength reduction relative to the base materials and important losses in ductility were reported.

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Section: Leitao Et Al / Materials and Design XXX (2008) Xxx-xxxcontrasting

confidence: 42%

Mechanical behaviour of similar and dissimilar AA5182-H111 and AA6016-T4 thin friction stir welds

et al. 2009

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“…Figure 8 shows the typical fracture surface appearance of a FSP sample. The defects observed on the FSP side correspond to defects documented by other researches studying FSW of aluminium alloys [3].…”

Section: Fracture Surface Analysissupporting

confidence: 82%

The effect of Friction Stir Processing on the fatigue life of MIG-Laser hybrid welded joints as compared to conventional FSW 6082-T6 aluminium joints

Botes¹,

Hattingh²,

Mjali³

2009

WIT Transactions on Engineering Sciences

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From previous research, Friction Stir Processing (FSP) was identified as a unique processing method that could be applied to improve the microstructure of welded non-ferrous alloys. FSP is similar to Friction Stir Welding (FSW) in that the material is processed below the melting point of the material, but the emphasis is not to produce a joint as in the case of FSW, but to improve mechanical performance. The difference between the two processes is that FSP is used to improve an existing weld's mechanical properties through microstructure refinement. This investigation was conducted on an aluminium alloy due to the relative difficulty with which defect free welds can be produced using conventional fusion welding processes. The aluminium alloy sections were joined using a MIG-laser hybrid process with varying gap widths between the adjoining plates. Similarly, a number of plates were also prepared using a conventional FSW process for comparative purposes. After fabrication, samples were sectioned from the welded plates for mechanical testing in order to evaluate the integrity of the welds. Mechanical properties were evaluated by tensile, fatigue and microhardness testing. Based on comparative results between the FSP MIG-laser hybrid (FSPMLH), the MIG-laser hybrid (MLH) and FSW for the three different gap widths evaluated, several general trends could be observed: weld efficiency (based on tensile strength) was the highest for the 0mm gap MIG-laser hybrid welded plates; FSP had a negligible effect on the tensile strength of the MIG-laser hybrid welded plates, but the percentage elongation values increased significantly. The effect of FSP on fatigue life became more noticeable as the width of the gap between adjoining plates increased. Microstructure evaluation revealed that FSP resulted in a refinement of the as-welded dendritic structure as well as eliminating porosity in the weld.

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“…[17][18][19][20][21][22][23][24][25][26] While the FSW of aluminum alloys has engendered considerable scientific and technological interest, material property data are still limited, especially on fatigue properties that directly limit the widespread applications of the FSW process. [7,[18][19][20][21][22][23][24][25][26] The 7xxx-series aluminum alloys exhibit very high strength but also poor ductility and high notch sensitivity. [27] The fatigue of the commercial 7075Al-T6 alloy has received considerable attention.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Cyclic Deformation Behavior of a Friction-Stir-Welded 7075 Al Alloy

Feng

Chen

2010

Metall Mater Trans A

119

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Microstructural changes and cyclic deformation characteristics of friction-stir-welded 7075 Al alloy were evaluated. Friction stir welding (FSW) resulted in significant grain refinement and dissolution of g¢ (Mg(Zn,Al,Cu) 2 ) precipitates in the nugget zone (NZ), but Mg 3 Cr 2 Al 18 dispersoids remained nearly unchanged. In the thermomechanically affected zone (TMAZ), a high density of dislocations was observed and some dislocations were pinned, exhibiting a characteristic Orowan mechanism of dislocation bowing. Two low-hardness zones (LHZs) between the TMAZ and the heat-affected zone (HAZ) were observed, with the width decreasing with increasing welding speed. Cyclic hardening and fatigue life increased with increasing welding speed from 100 to 400 mm/min, but were only weakly dependent on the rotational rate between 800 and 1200 rpm. The cyclic hardening of the friction-stir-welded joints exhibiting a two-stage character was significantly stronger than that of the base metal (BM) and the energy dissipated per cycle decreased with decreasing strain amplitude and increasing number of cycles. Fatigue failure occurred in the LHZs at a lower welding speed and in the NZ at a higher welding speed. Fatigue cracks initiated from the specimen surface or near-surface defects in the friction-stirwelded joints, and the initiation site exhibited characteristic intergranular cracking. Crack propagation was characterized by typical fatigue striations along with secondary cracks.

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Weld tool travel speed effects on fatigue life of friction stir welds in 5083 aluminium

Cited by 109 publications

References 4 publications

Mechanical behaviour of similar and dissimilar AA5182-H111 and AA6016-T4 thin friction stir welds

Mechanical behaviour of similar and dissimilar AA5182-H111 and AA6016-T4 thin friction stir welds

The effect of Friction Stir Processing on the fatigue life of MIG-Laser hybrid welded joints as compared to conventional FSW 6082-T6 aluminium joints

Microstructure and Cyclic Deformation Behavior of a Friction-Stir-Welded 7075 Al Alloy

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