Effect of self-support friction stir welding on microstructure and microhardness of 6082-T6 aluminum alloy joint

Wan, Long; Huang, Yu Dong; Lv, Zhiliang; Lv, Shixiong; Feng, Jicai

doi:10.1016/j.matdes.2013.09.073

Cited by 82 publications

(34 citation statements)

References 32 publications

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“…4b). The highest values were measured for 25 and 30 seconds CMT times, which were similar to the values found by Wan et al [4] and Gungor et al [5]. However, the vertical micro-hardness measurements in joint zone at nine points (Fig.…”

Section: Microhardnesssupporting

confidence: 89%

“…Aluminium and its alloys are vital to the aerospace industry and are important in transportation and structures, such as building facades and window frames. Aluminium alloys are classified in different series, depending on their composition ratios [2,[3][4][5]. The aluminium series 6082-T6 is preferred due to its good weldability, high corrosion resistance and good formability [3].…”

Section: Introductionmentioning

confidence: 99%

“…• C. This requires high heat input [1,2], which, in turn, causes changes of the internal structure and aging of aluminium and worsens the mechanical properties [4].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Tensile Properties of Aluminum 6082-T6 Alloys Joined by Cold Metal Transfer Method by Using Different Working Time

et al. 2017

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In this study, Aluminium 6082-T6 plates having 1.0 mm thickness were joined by magnesium-based (AlMg5) wire in cold metal transfer technique. The specimens were prepared in butt joint form. Argon was used as shielding gas and joining operations were done at gas flow speed of 13 l/min. The joining operations were carried out during four different working times of 25, 30, 35, 40 and 45 seconds. Tensile properties of joints were determined and macro-structures of joints were investigated in order to evaluate the joinability of Aluminium 6082-T6 alloy by cold metal transfer technique. Finally, the micro-hardness values of specimens were measured.

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Section: Microhardnesssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Investigation of Tensile Properties of Aluminum 6082-T6 Alloys Joined by Cold Metal Transfer Method by Using Different Working Time

et al. 2017

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“…Besides that, the micro-hardness in thermo-mechanically affected zone (TMAZ) gives the hardest value with an average of 89.4HV. The same condition was found in the lower part [14]. This paper will study the external surface hardness condition of friction stir welded aluminum alloy 6063 pipe butt joint.…”

Section: Introductionsupporting

confidence: 69%

Surface Hardness of Friction Stir Welded AA6063 Pipe

Ismail

Awang

2014

MATEC Web of Conferences

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Abstract. The external surface hardness of friction stir welded aluminum alloy 6063 pipe joint was investigated in this paper. The 89mm of outside diameter pipe with 5mm of wall thickness was used as test pipe piece for this experiment on closed butt joint configuration by utilising Bridgeport 2216 CNC milling machine and orbital clamping unit specially designed to cater for this task and function. Several welded samples were produced on varying process parameters which were successfully joined by using a non-consumable tool with a flat shoulder and a cylindrical pin.

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“…For BFSW, as a recent alternative, most of the work is focused on the material performance [27,28] or attempting to explain the formation mechanism of the internal defects based on metallurgical observations [24,[27][28][29]. There have been attempts to model the CFSW process using numerical simulation, e.g., as a thermo-mechanical phenomenon [30,31], but these efforts have not yet yielded a consolidated theory for the development of defects.…”

Section: Literaturementioning

confidence: 99%

Formation Mechanisms for Entry and Exit Defects in Bobbin Friction Stir Welding

Tamadon

Pons

Sued

et al. 2018

Metals

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Bobbin friction stir welding (BFSW) is an innovative variant for the solid state welding process whereby a rotating symmetrical tool causes a fully penetrated bond. Despite the process development, there are still unknown variables in the characterization of the process parameters which can cause uncontrolled weld defects. The entry zone and the exit zone consist of two discontinuitydefects and removing them is one of the current challenges for improving the weld quality. In the present research, the characteristic features of the entry and exit defects in the weld structure and formation mechanism of them during the BFSW processing was investigated. Using stacked layers of multi-colour plasticine the material flow, analogous to metal flow, can be visualised. By using different colours as the path markers of the analogue model, the streamline flow can be easily delineated in the discontinuity defects compared with the metal welds. AA6082-T6 aluminium plates and multi-layered plasticine slabs were employed to replicate the entry-exit defects in the metal weld and analogue samples. The fixed-bobbin tool utilized for this research was optimized by adding a thread feature and tri-flat geometry to the pin and closed-end spiral scrolls on both shoulder surfaces. Samples were processed at different rotating and longitudinal speeds to show the degree of dependency on the welding parameters for the defects. The analogue models showed that the entry zone and the exit zone of the BFSW are affected by the inhomogeneity of the material flow regime which causes the ejection or disruption of the plastic flow in the gap between the bobbin shoulders. The trial aluminium welds showed that the elimination of entry-exit defects in the weld body is not completely possible but the size of the defects can be minimized by modification of the welding parameters. For the entry zone, the flow pattern evolution suggested formation mechanisms for a sprayed tail, island zone and discontinuity-channel. For the exit zone a keyhole-shaped discontinuity is discussed as a structural defect.

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Effect of self-support friction stir welding on microstructure and microhardness of 6082-T6 aluminum alloy joint

Cited by 82 publications

References 32 publications

Investigation of Tensile Properties of Aluminum 6082-T6 Alloys Joined by Cold Metal Transfer Method by Using Different Working Time

Investigation of Tensile Properties of Aluminum 6082-T6 Alloys Joined by Cold Metal Transfer Method by Using Different Working Time

Surface Hardness of Friction Stir Welded AA6063 Pipe

Formation Mechanisms for Entry and Exit Defects in Bobbin Friction Stir Welding

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