Notch tensile response of mini-regions in AA2024 and AA2524 friction stir welds

Yan, Jiwang; Sutton, Michael A.; Reynolds, Anthony P.

doi:10.1016/j.msea.2006.04.087

Cited by 14 publications

(23 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The periodic characteristic is ubiquitously found in friction stir welding (FSW) and has been widely reported in the literature [1-12]. This kind of feature can be optically observed as periodic material flow behaviour or alternating light and dark banded structures in the horizontal cross-section, and also as onion ring structures of weld nugget in the transverse cross-section.…”

Section: Introductionmentioning

confidence: 99%

“…This kind of feature can be optically observed as periodic material flow behaviour or alternating light and dark banded structures in the horizontal cross-section, and also as onion ring structures of weld nugget in the transverse cross-section. Numerous researches have detected that the periodic feature has substantial influence on the variation of texture, grain size, fracture behaviour and micro-hardness of the joint, and could be correlated with the periodic fluctuation of welding loads during FSW process [4][5][6]9,[13][14][15]. However, few works have focused on its formation mechanism.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Formation of the periodic material flow behaviour in friction stir welding

Wang

Chen

2021

Science and Technology of Welding and Joining

View full text Add to dashboard Cite

A two-dimensional computational fluid dynamics model is established to verify the correlation between periodic material flow and tool eccentricity during friction stir welding (FSW) process. In the model, the marker material is tracked by employing the Volume of Fluid technique. Besides, a novel boundary condition is proposed, which is not only non-uniformly distributed around the pin but is also connected with the real-time orientation of tool eccentricity. Finally, the dynamic evolution of marker material with the pin rotating is analysed, and the comparison between calculated and measured distribution of deposited marker material is carried out. The result demonstrates that tool eccentricity can be considered as the original mechanism for the formation of periodic material flow behaviour in FSW.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation of the periodic material flow behaviour in friction stir welding

Wang

Chen

2021

Science and Technology of Welding and Joining

View full text Add to dashboard Cite

show abstract

“…[1][2][3] The technique offers new design and production welding opportunities, especially for aluminium alloys, which are widely used in many industries but difficult to fusion weld. 3,4 Extensive FSW research has been undertaken for welding tool design, [5][6][7] weld parameter optimisation, [8][9][10][11][12][13][14] microstructure characterisation and evaluation, 9,13,15,16 mechanical response [17][18][19][20][21] and material flow behaviour. [22][23][24] Relative to fusion welds, a comparable FSW typically has enhanced material properties, lower residual stresses and considerably higher joint strength.…”

Section: Introductionmentioning

confidence: 99%

Processing and banding in AA2524 and AA2024 friction stir welding

Yan¹,

Sutton²,

Reynolds³

2007

Science and Technology of Welding and Joining

View full text Add to dashboard Cite

An attempt has been made to clarify the relationship between the periodicity of process parameters and that of the micro-/mesostructural banding in friction stir welding (FSW). The oscillation of FSW parameters was measured and analysed during baseline experiments without welding and during a series of FSW of AA2524 and AA2024 aluminium alloys; the banded structures in all the welds were also characterised. It is found that independent of the tool runout, there are well defined periodic variations in the process forces, the translational resistance force F x ) and Z axis force F z of the welding tool in all joints. The measured band spacing is closely correlated with the oscillation period of process forces F x and F z , exerted on and by the welding tool. The direct and consistent relationship observed between periodicity in variation of F x and F z and the metallurgical structure, e.g. grain size, particle distribution, band width and microhardness, indicate that the formation of banded structures in FSW joints is related to the periodic variation of welding parameters.

show abstract

“…In general, the advancing side has higher tensile properties and hardness. [10][11][12][13] As an effect of the friction stir welding process, four different forms of microstructure are observed in the welded plates. Parent material (PM) which exists relatively far from bond line shows no material deformation during the FSW process.…”

Section: Introductionmentioning

confidence: 99%

Residual stress characterization in 12%-Cr steel friction stir welds by neutron diffraction

Jun

Hofmann

Hofmann³

et al. 2012

The Journal of Strain Analysis for Engineering Design

View full text Add to dashboard Cite

In the present paper we report the results of a study into friction stir welds made in 12.7 mm-thick 12%-Cr steel plates. Residual stress measurements were performed using angle-dispersive neutron diffraction. Complete characterization of the three-dimensional residual stress state in friction stir weld samples was obtained by analysing diffracted peaks; peak broadening for identifying the regions of severe plastic deformation and the associated residual strain (eigenstrain) acting as the source of residual stress and peak shifting for evaluating residual elastic strains in the welded component. Three different methods were used to address the key issue of determining the d 0 variation across the weld. The comb (or matchstick) method was compared with two other approaches: the balance method, and the zero traction method. It was found that a combination of the comb and the zero traction methods allows reliable residual strain/stress distributions.

show abstract

Notch tensile response of mini-regions in AA2024 and AA2524 friction stir welds

Cited by 14 publications

References 29 publications

Formation of the periodic material flow behaviour in friction stir welding

Formation of the periodic material flow behaviour in friction stir welding

Processing and banding in AA2524 and AA2024 friction stir welding

Residual stress characterization in 12%-Cr steel friction stir welds by neutron diffraction

Contact Info

Product

Resources

About