Effect of reverse material flow on the microstructure and performance of friction stir welded T-joints of an Al-Mg alloy

Feistauer, Eduardo E.; Bergmann, Luciano; Santos, Jorge F. dos

doi:10.1016/j.msea.2018.06.056

Cited by 28 publications

(10 citation statements)

References 21 publications

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“…14. Here the material at the front AS seems to be involved into tool pin while that at the back RS is nearly escaped from tool pin. This might lead to the mixture of material at the AS1 was more severe than that at the RS1, as reported by Feistauer et al (2018), Donatus et al (2015), and Buffa et al (2008). In addition, the KBs at the RS1 must be achieved by horizontal material flow that moved from the RS1 to the AS1, as reported by Hao et al (2019).…”

Section: Discussionmentioning

confidence: 94%

“…Among these defects, the kissing bonds at two corner fillets seem to be too hard to be eliminated only by changing welding parameters, especially when it is formed at retreating side. In order to minimize this type of defect, Feistauer et al (2018) tried to use the second-pass welding by keeping the similar direction of FSW tool rotation but the reserved welding direction. Consequently, the size of kissing bond defects was significantly reduced.…”

Section: Introductionmentioning

confidence: 99%

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Effects of tool offset and reversed metal flow on mechanical properties of dissimilar friction stir welded T-lap joints between AA7075 and AA5083

Duong

Okazaki²,

Tran

2020

Mechanical Engineering Journal

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Effects of tool offset and reversed metal flow on mechanical properties of dissimilar friction stir welded T-lap joints between AA7075 and AA5083 AbstractThe effects of tool offset and the reversed metal flow induced by a double-pass friction stir welding (FSW) on the welding interface characteristics were investigated in a dissimilar thickness T-lap joint between 7075-T651 and 5083-H116 aluminum alloys. The performance of the joint was evaluated by the skin and stringer tensile tests. The experimental results showed that the bonding interface could be improved by applying double-pass welding which the tool was offsetted toward advancing side. An employment of the double-pass welding significantly improved the strength so that the joint efficiency reached about 90% in comparison with the 5083 base metal strength while the tensile strength of the joint produced by the single-pass welding was quite low. The kissing bond defects were found to be the main culprit in the tensile behavior of the T-lap joint. The reversed metal flow and the gap distance between pin and die played a key role in the formation of the welding interface.

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Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Effects of tool offset and reversed metal flow on mechanical properties of dissimilar friction stir welded T-lap joints between AA7075 and AA5083

Duong

Okazaki²,

Tran

2020

Mechanical Engineering Journal

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“…Even an off-shoot of this welding technology: friction stir processing (FSP), is being applied for the manufacturing of aluminium metal matrix composites [15][16][17][18]. Recent studies by Donati [19][20][21][22][23][24] have demonstrated that FSW has proved to be a promising technology for fabrication of T-joint and similar tailor-welded blanks (TWB) from high strength age-hardened aluminium alloys. T-joint configurations are typically used in ships, decking and hull areas of high-speed crafts, and aircraft fuselage etc.…”

Section: Introductionmentioning

confidence: 99%

“…Acerra et al [25] performed FSW on AA2024-T4 and AA7075-T6 through a comprehensive experimental campaign on T-shaped parts and concluded that for carefully chosen tool geometry, a slight increase in the diameter of tool shoulder can increase the productivity rate. Feistauer et al [23] studied the effect of reverse material flow on the microstructure of friction stir welded Al-Mg alloy T-joint, and observed that kissing bond (KB) defect drastically lowered the mechanical properties. The properties were significantly improved after second pass in the reverse direction.…”

Section: Introductionmentioning

confidence: 99%

Defect formation during dissimilar aluminium friction stir welded T-joints

Ali

Anjum

Siddiquee

et al. 2020

Mechanics & Industry

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AA8011 remains one of the largest used aluminium alloys due to excellent ductility, corrosion resistance and sufficient strength in H14 conditions. The 5754, due to high strength and corrosion resistance finds key applications in marine, process industry, automobile and nuclear applications. A T-joint combination of the two alloys (when stronger forming is stiffeners) results in significant weight savings. The T-joint between 8011 and 5754 (with the latter forming the stringer) is highly prone to defect formation due to the stronger material being placed away from the heat source. In this paper, friction stir welding of AA5754 and AA8011 aluminium alloys in T-lap configuration is performed. Effects of processing parameters namely tool transverse speed, rotational speed and shoulder diameter on the weld properties are studied with the help of micro-hardness, macrostructure and microstructure analysis. Analysis of defects such as tunnel and kissing bond, and mechanism of defect formation is also discussed. Tunnel defect is observed on advancing side in all the samples, which is attributed to high heat flux on advancing side, insufficient material flow in the vertical direction and asymmetric flow of plasticized material from advancing side to retreating side. The size of the defect is found to increase with increase in shoulder diameter keeping the rotational speed constant. Kissing bond defect was also observed in some samples owing to the presence of oxide layer between the joining surfaces.

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“…ey revealed the defect characteristics of T-joints and analyzed the influence of defects on tensile strength and the best assembly method was given finally. Feistauer [17] and his colleagues used a second pass to ensure the welding of the Al/Mg T-joint by maintaining a similar speed, which significantly reduced the kissing defect on the retreating side (RS). Fratini [18] studied the effects of material properties on T-joints and found that the materialrelated thermal and plastic fields affect the thermomechanical affected zone (TMAZ), heat-affected zone (HAZ), and nugget zone in the joint.…”

Section: Introductionmentioning

confidence: 99%

Effect of Traverse Speed on the Defect Characteristic, Microstructure, and Mechanical Property of Friction Stir Welded T‐Joints of Dissimilar Mg/Al Alloy

Sun

Shen

et al. 2020

Advances in Materials Science and Engineering

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The AZ31 B/2024-T4 T-lap-joint was successfully fabricated by friction stir welding (FSW) with different welding parameters. The defect characteristics and metallurgical structure were observed and analyzed using optical microscope (OM) and scanning electron microscopy (SEM). Besides, the effects of defects and welding parameters on mechanical properties were investigated. The results show that an effective metallurgical reaction zone can be formed between Mg and Al (Mg-Al MRZ) and the island structures and lamellar structures appeared in the Mg-Al MRZ. The T-joints without tunnel defects can be obtained and the excellent mechanical properties of the T-joint were achieved using the welding speed of 50 mm/min. The tensile strength along the skin and the stringer was mainly affected by the kiss bonding defects.

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Effect of reverse material flow on the microstructure and performance of friction stir welded T-joints of an Al-Mg alloy

Cited by 28 publications

References 21 publications

Effects of tool offset and reversed metal flow on mechanical properties of dissimilar friction stir welded T-lap joints between AA7075 and AA5083

Effects of tool offset and reversed metal flow on mechanical properties of dissimilar friction stir welded T-lap joints between AA7075 and AA5083

Defect formation during dissimilar aluminium friction stir welded T-joints

Effect of Traverse Speed on the Defect Characteristic, Microstructure, and Mechanical Property of Friction Stir Welded T‐Joints of Dissimilar Mg/Al Alloy

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