Effect of process parameters on microstructure and mechanical properties of friction stir-welded Ti–6Al–4V joints

Fall, Ameth; Jahazi, Mohammad; Khodabandeh, Alireza; Fesharaki, M. H.

doi:10.1007/s00170-016-9527-y

Cited by 24 publications

(14 citation statements)

References 34 publications

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“…Continuous protection of the joint area from oxidation was achieved by argon gas protection over the entire joint area. Further details regarding the experimental setup have been published elsewhere [21] and, to avoid repetition, will not be provided here. In order to examine the effect of process parameters on tool wear and its rate, the weight of the device (pin and tool) were measured before and after FSW using a micro balance with an accuracy of 1 mgr.…”

Section: Tool Materialsmentioning

confidence: 99%

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Tool Wear Characteristics and Effect on Microstructure in Ti-6Al-4V Friction Stir Welded Joints

Fall

Fesharaki

Khodabandeh

et al. 2016

Metals

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Abstract:In the present paper, tool wear and the rate of wear during friction stir welding (FSW) of Ti-6Al-4V alloy are investigated. A conical tungsten carbide tool was used to produce butt-type friction stir welded joints in two-millimeter thick Ti-6Al-4V sheets. An original design of a movable pin allowed for the examination of the tool damage for each process condition. The influence of tool degradation on the quality of the welded joints and the damage brought to the microstructure are examined and discussed. For this purpose, optical and scanning electron microscopies as well as EDX analyses were used to examine the tool wear and the resulting macrostructures and microstructures. The type and nature of the defects are also analyzed as a function of FSW processing parameters. Important geometry and weight variations were observed on the pin and shoulder for all welding conditions, in particular when low tool rotation and travel speeds were used. Experimental results also show that the radial wear of the pin is not uniform, indicating the presence of important frictional temperature gradients through the thickness of the joint. The maximum wear was measured at a location of about one millimeter from the pin root center. Finally, tool rotation was determined as the most significant process parameter influencing both tool wear and microstructure of the joints.

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Section: Tool Materialsmentioning

confidence: 99%

Section: Tool Materialsmentioning

confidence: 99%

Tool Wear Characteristics and Effect on Microstructure in Ti-6Al-4V Friction Stir Welded Joints

Fall

Fesharaki

Khodabandeh

et al. 2016

Metals

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“…Зарубежные исследователи активно проводят исследования по сварке титановых сплавов [25][26][27]. Результаты экспериментов показывают, что получение сварных швов титановых сплавов марок Ti-6Al-4V, Ti-5111 возможно, при этом используются различные конфигурации пина инструмента и различный материал инструмента.…”

Section: рис 1 исследовательская установка для сварки трением с перunclassified

Welded Joint of Titanium Plates Manufacturing by Friction Stir Welding

Chernykh¹,

Васильев²,

Chekalin³

et al. 2018

DSMM

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Аннотация. Изделия из титановых сплавов широко используются в таких отраслях, как авиа-и ракетостроение, судостроение. Для сборки корпусов из титановых сплавов используется сварка плавлением, что является достаточно трудоёмким и дорогостоящим процессом. Снижение трудоемкости и себестоимости операции сваривания титановых сплавов возможно за счет внедрения метода сварки трением с перемешиванием (СТП). В статье рассматривается распространение метода СТП в России, проводится исследование свариваемости титановых сплавов ОТ-4 и ВТ-20 методом СТП. Целью исследования является получение сварного соединения данных сплавов, отсутствие дефектов в виде «непроваров» и разработка специального инструмента для получения сварного соединения, а также получение информации о процессе сварки и разработке рекомендаций по сварке титановых сплавов методом СТП. Проведена серия экспериментов, цель исследования достигнута частично для сплава ОТ-4 и достигнута полностью для сплава ВТ-20. Разработан инструмент для СТП титановых сплавов, приведены данные по сварке при различных режимах, возникающие при этом силы и температуры. Ключевые слова: сварка трением с перемешиванием, титановые сплавы, микроструктура, термодеформационная сварка, фрикционная сварка.

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“…Some researchers have FSWed pure titanium and titanium alloy using pure tungsten and tungsten alloys [5,6], sintered TiC [7] and pcBN [8] as welding tool materials. Zhou et al [9] and Fall et al [10] have developed some equipment with water cooling system for FSW of titanium alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of Welding Parameters on Friction Stir Welded Ti–6Al–4V Joints: Temperature, Microstructure and Mechanical Properties

Cao

Shen

2020

Metals

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In this study, friction stir welding (FSW) of 2-mm-thick Ti–6Al–4V alloy plates was performed using a newly designed friction tool—and the effect of rotation speed and welding speed on microstructure and mechanical properties of the joints were investigated. A simulation model for FSW temperature field calculation was developed, and the effect of rotation speed and welding speed on the temperature field was investigated by experimental and numeric methods. The results show that the rotation speed has a dominant effect on peak temperature, while welding speed determines the dwell time of the weld exposed to high temperatures. In addition, the influence of process parameters on the microstructure of the joints was investigated using optical and scanning electron microscopy. The results revealed that there was a phase transformation in the stir zone during welding. The final microstructure of the stir zone was fully lamellar (α + β) structure, and the heat affection zone had a bimodal microstructure consisting of prior equiaxed α and lamellar (α + β) structure. Both rotation speed and welding speed affect the grain size of the weld. Lower peak temperature with decreasing spindle speed and/or shorter dwell time with increasing feed rate could produce finer grains in the stir zone of the joints, thereby could lead to higher microhardness value and the tensile strength of the joints.

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Effect of process parameters on microstructure and mechanical properties of friction stir-welded Ti–6Al–4V joints

Cited by 24 publications

References 34 publications

Tool Wear Characteristics and Effect on Microstructure in Ti-6Al-4V Friction Stir Welded Joints

Tool Wear Characteristics and Effect on Microstructure in Ti-6Al-4V Friction Stir Welded Joints

Welded Joint of Titanium Plates Manufacturing by Friction Stir Welding

Effect of Welding Parameters on Friction Stir Welded Ti–6Al–4V Joints: Temperature, Microstructure and Mechanical Properties

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