The role of rotation speed on intermetallic compounds formation and mechanical behavior of friction stir welded brass/aluminum 1050 couple

Esmaeili, Ali; Rajani, H.R. Zareie; Sharbati, Mohammad Taghi; Givi, Mohammad Kazem Besharati; Shamanian, M.

doi:10.1016/j.intermet.2011.07.006

Cited by 91 publications

(42 citation statements)

References 11 publications

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“…It was also reported that very high rotational speed results in generation of large amount of brittle IMCs due to high heat input. These IMCs cause the defects such as voids and cracks in stir zone [7,14]. Extremely low rotation speed results in imperfect joints due to lack of heat production.…”

Section: Introductionmentioning

confidence: 99%

“…Extremely low rotation speed results in imperfect joints due to lack of heat production. Less heat cannot produce proper plastic deformation hence results in an unsuitable material flow, which generates defects, especially macro crack along the upper surface of the stir zone [7, 14,15]. Zadeh et al [16] reported that, decreasing the welding speed at constant rotational speeds leads to similar trend to increasing the rotational speeds at constant welding speeds.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Tilt Angle on the Properties of Dissimilar Friction Stir Welding Copper to Aluminum

Mehta

Badheka

2014

Materials and Manufacturing Processes

155

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In the present investigation, dissimilar materials such as electrolytic tough pitch copper and aluminum 6061-T651 were welded by friction stir welding technology. Effects of tool tilt angle on mechanical and metallurgical properties were studied experimentally for dissimilar materials system. In the present study, the tool tilt angle was varied from 0˚ to 4˚ with an interval of 1˚ while the other parameters such as rotational speed, welding speed, tool pin offset, workpiece material position were kept constant. Macrostructure analysis, tensile test, macro hardness measurement, scanning electron microscopy and energy dispersive x-ray spectrographic tests were performed to evaluate weld properties of dissimilar copper-aluminum joint. The results revealed that a defect free dissimilar copper-aluminum friction stir welding was achieved by tilt angles 2˚, 3˚ and 4˚.Maximum tensile strength was reported 117 MPa and macro hardness was reported 181 VH (in nugget zone) at the 4˚ tilt angle. Macro hardness was increased as tilt angle increases from 0˚ to 4˚. In addition to this, thermo-mechanically affected zone (at copper side) was found to be the weakest zone for dissimilar copper-aluminum friction stir welding system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Tilt Angle on the Properties of Dissimilar Friction Stir Welding Copper to Aluminum

Mehta

Badheka

2014

Materials and Manufacturing Processes

155

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“…Esmaeili et al [17] observed that the mechanical behavior of the joints is influenced by the rotational speed. They reported that tensile strength of the welded joint increases due to the formation of thin intermetallic layer and composite multilayer structure in the stir zone.…”

Section: Introductionmentioning

confidence: 99%

The effect of preheating on mechanical properties of friction stir welded dissimilar joints of pure copper and AA7075 aluminum alloy sheets

Safi

Amirabadi

Givi

et al. 2015

Int J Adv Manuf Technol

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In this paper, apart from introducing brand-new warm friction stir welding (WFSW) method, the effect of preheating on the mechanical properties of dissimilar friction stir welded copper/aluminum alloy sheets was investigated. Sheets of aluminum alloy 7075 and copper both with the thickness of 5 mm were used. The utilized welding tool was made of a H-13 tool steel with a threaded cone shape. Rotational speeds (ω) of 1200-1400 rpm and travel speeds (v) of 50-100 mm/min were used for better understanding of the effect of welding parameters on heat input. The sheets were kept in furnace with temperatures of 75 and 125°C, and welding was done afterward. At last, tensile test was done to compare the mechanical properties of the welds. The tensile test results showed 100 % increase in the strength of preheated joints in comparison with the non-preheated joints which were welded at room temperature. Considering the high thermal conductivity of both copper and aluminum, the reason of increase in strength of the joints could be related to the low temperature gradient between the weld zone and base metal because the heat gets out of the stir zone with lower steep. The maximum strength occurred for the specimen with the preheating of 75°C, rotational speed of 1300 rpm, and travel speed of 75 mm/min.

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“…Rotational speed and welding speed have a major influence on a frictional heat generation, plastic deformation, stir zone size, defect generation, and tool wear in Cu-Al FSW. 19,20 Hence, it is necessary to use an optimum combination of rotational and welding speed, which have a direct influence on the quality of metallurgical bonding. In this study, rotational speed and welding speed were varied at three different levels.…”

Section: Machining Of Channels In Base Platementioning

confidence: 99%

Thermal Performance Evaluation of Friction Stir Welded and Bolted Cold Plates with Al/Cu Interface

Lakshminarayanan¹,

Suresh²,

Varshan³

2015

JOM

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An attempt is made to design and fabricate a cold plate with aluminum-copper dissimilar interface joined by friction stir welding. Optimum welding conditions for obtaining sound-quality corner and T joints with an aluminumcopper interface were established. Welded cross sections of the friction stir welded cold plate were analyzed to understand the bonding characteristics. Computational fluid dynamics (CFD) was used to evaluate the fluid-flow characteristics and thermal resistance of friction stir welded cold plate and the resulted are compared with the conventional bolted cold plate configuration. For CFD modeling of a cold plate with a dissimilar interface, a new methodology is proposed. From the CFD analysis and experimental results, it is observed that friction stir welded cold plate offered better thermal performance compared to the bolted cold plate and it is due to the metallurgical bonding at the aluminum-copper interface with the dispersion of copper particles.

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The role of rotation speed on intermetallic compounds formation and mechanical behavior of friction stir welded brass/aluminum 1050 couple

Cited by 91 publications

References 11 publications

Effects of Tilt Angle on the Properties of Dissimilar Friction Stir Welding Copper to Aluminum

Effects of Tilt Angle on the Properties of Dissimilar Friction Stir Welding Copper to Aluminum

The effect of preheating on mechanical properties of friction stir welded dissimilar joints of pure copper and AA7075 aluminum alloy sheets

Thermal Performance Evaluation of Friction Stir Welded and Bolted Cold Plates with Al/Cu Interface

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