Mechanical properties and failure mechanisms of friction stir spot welds of AA 6061-T4 sheets

Shen, Zhikang; Yang, Xinqi; Zhang, Zhaohua; Cui, Lei; Yin, Yuhuan

doi:10.1016/j.matdes.2013.01.066

Cited by 73 publications

(44 citation statements)

References 23 publications

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“…The hook defect is formed due to the movement of material upwards when the tool performs the penetration process on the workpiece and becomes one of the factors that causes the joint strength to decrease significantly [22,27]. This can be avoided by using rotational speed parameters and dwell time, because the increasing rotational speed and dwell time the stir zone will be wider causing the hook defect to stay away from the keyhole [15]. Table 1 shows the effect of rotational speed and dwell time on the area of metallurgical bonded zone (MBD).…”

Section: Results and Discusscion A) Macro Photo Results Datamentioning

confidence: 99%

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Effect of Rotational Speed and Dwell Time on Physical and Mechanical Properties of Friction Stir Spot Welding Aluminium 1100 With Zn Powder Interlayer Addition

Noor

Muhayat²,

Triyono³

2019

Mekanika

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<p><em>Friction stir spot welding (FSSW) is one of the development of solid state welding to joint lightweight materials such as aluminium. In the automotive industry, lightweight materials are needed in the structure of vehicle construction to improve efficiency in vehicles. This research aims to find out how the effect of rotational speed and dwell time on physical and mechanical properties on the weld joint of aluminium 1100 with Zn interlayer addition. Variations used in rotational speed 1000, 1250, 1600 rpm and dwell time 6, 7, 8 s. Pullout fracture occur in tensile tests that are getting bigger with increasing rotational speed and dwell time. The results of SEM and EDS observations showed that the metallurgical bonded zone increased and kept the hook defect away. The spread of Zn in the stir zone area causes the formation of solid Al-Zn phase in a solid solution. The hook defect filled with Zn can minimize cracks that occur, so increased the tensile shear load. The highest tensile shear load value of FSSW AA1100 without Zn interlayer is 3.61 kN, while the FSSW AA1100 with Zn interlayer addition is 4.34 kN.</em></p>

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Section: Results and Discusscion A) Macro Photo Results Datamentioning

confidence: 99%

“…Figure 4. The tensile speed used is in accordance with the JIS Z 3136 standard [26] which is a constant of 1 mm / min. Macro structure testing is conducted to observe FSSW joint zones and hook defects at each variation of rotational speed and dwell time.…”

Section: Methodsmentioning

confidence: 99%

Effect of Rotational Speed and Dwell Time on Physical and Mechanical Properties of Friction Stir Spot Welding Aluminium 1100 With Zn Powder Interlayer Addition

Noor

Muhayat²,

Triyono³

2019

Mekanika

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“…Fersini and Pirondi [29] had been conducted a research work to study and analyze the fatigue behavior of friction stir welded aluminum alloy Al2024-T3 materials. Shen et al [30] had been studied the mechanical properties and failure mechanisms of aluminum alloy AA 6061-T4 sheets in friction stir spot welding. Kah et al [31] had been investigated the weld defects in aluminum alloys welded by friction stir welding and fusion welding.…”

Section: Literature Reviewmentioning

confidence: 99%

Recent Advances in Joining of Aluminum Alloys by Using Friction Stir Welding

Rudrapati¹

2020

Mass Production Processes

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Aluminum and its alloys have gained much interest in advanced industrial applications due to its excellent mechanical properties. Welding is one of prominent fabrication technique which has to be performed to make assembling of different parts to create one complete product. Welding of aluminum alloys (al) using traditional welding methods is difficult task due to un-weldability of aluminum alloys, more defects in weldment, presence of aluminum oxide film, etc. Friction stir welding (FSW) is a novel welding technique which was developed specially to join the aluminum alloys without melting of materials to be joined. Achieving the good qualities of welded joint with enhanced efficiency of the FSW process needs, proper understanding of principles of FSW. In the present chapter, various aspects of FSW of aluminum alloys related to effects of process welding parameters and temperature distribution during welding on mechanical and metallurgical properties of weldment has been presented. Extending applications of FSW in joining of dissimilar aluminum alloys and welding of al alloys with other materials has also been discussed. Concluding remarks are drawn from the study. From the study, it is stated that FSW is suitable for mass production welding method for joining of similar/dissimilar aluminum alloy materials in large quantity of similar products.

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“…They are also expected to be applied in the automobile manufacturing owing to their high specific strength. However, the resistance spot welding (RSW) which is the conventional joining technology for the car body has obvious disadvantages in joining aluminum alloys, such as high energy consumption, low mechanical property, and high welding deformation [1]. In order to realize high quality joining for aluminum alloys, a new solid-state welding technology called refill friction stir spot welding (RFSSW) is developed by Helmholtz-Zentrum Geesthacht [2].…”

Section: Introductionmentioning

confidence: 99%

Microstructures Evolution in Refill Friction Stir Spot Welding of Al-Zn-Mg-Cu Alloy

Zhao¹,

Dong²,

Wang³

et al. 2020

Metals

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In this study, Al-Zn-Mg-Cu alloy was refill friction spot welded, and the precipitates, dislocation, recovery, and recrystallization characteristics were focused. In the stir zone (SZ), continues dynamic recrystallization occurs under the intense plastic deformation. All the original GP (II) zones and η' precipitates dissolved into the aluminum matrix under the welding heat input, and the stable η and E precipitates remained. In the thermo-mechanically affected zone (TMAZ), high-density dislocations and subgrains boundaries can be observed. The continued dynamic recrystallization was not activated and only dynamic recovery occurs. Sub-boundaries and high-density dislocations in this zone can be observed. In this zone, the η precipitates are coarsened and dissolution is the main evolution mechanism for the GP (II) zones and η' precipitates. In the heat-affected zone (HAZ), no dislocation was induced and all the initial precipitates were coarsened under the welding heat input. The HAZ, the TMAZ, and the SZ constitute a soft region in the refill friction stir spot welding (RFSSW) joint, and the minimum value located at the interface between the HAZ and the TMAZ.

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Mechanical properties and failure mechanisms of friction stir spot welds of AA 6061-T4 sheets

Cited by 73 publications

References 23 publications

Effect of Rotational Speed and Dwell Time on Physical and Mechanical Properties of Friction Stir Spot Welding Aluminium 1100 With Zn Powder Interlayer Addition

Effect of Rotational Speed and Dwell Time on Physical and Mechanical Properties of Friction Stir Spot Welding Aluminium 1100 With Zn Powder Interlayer Addition

Recent Advances in Joining of Aluminum Alloys by Using Friction Stir Welding

Microstructures Evolution in Refill Friction Stir Spot Welding of Al-Zn-Mg-Cu Alloy

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