Stir zone microstructure and strain rate during Al 7075-T6 friction stir spot welding

Gerlich, A.P.; Avramovic-Cingara, G.; North, T. H.

doi:10.1007/bf02586110

Cited by 150 publications

(104 citation statements)

References 32 publications

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“…8), which is explained by the higher heat input and the consequent lower strain rate as described by Gerlich et al 18 . Some hardness peaks are present and may be related to intermetallic compounds (IMC), as already reported by Shojaeefard et al 13 .…”

Section: Microhardnessmentioning

confidence: 87%

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Effect of Heat Input on the Mechanical Behaviour of Al-Cu FSW Lap Joints

et al. 2018

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Dissimilar Al-Cu joints are desirable due to the combination of the good electrical and thermal properties of copper with the economic advantages of aluminium. However, different chemical, mechanical and thermal properties turn dissimilar welding into a challenge with traditional fusion welding techniques. Friction stir welding appears to be a good alternative to welding dissimilar materials. Most of the works in Al-Cu FSW have been performed with Al on top. This work investigates the influence of heat input on the shear strength of aluminium-copper lap joints produced by FSW with a copper over aluminium lap configuration. Welds produced with the ω/ν rate of 200 rev.mm -1 or 500 rev.mm -1 resulted in the melting of the base materials and material leaking. Joints with shear tensile strength varying from 76 to 85% of the original resistance of AA6060 T5 were produced when the ω/ν rate was varied from 80 to 110 rev.mm -1 . The fracture was governed by tension overload on the aluminium sheet, resulting in little influence of welding defects, such as tunnelling, on the joint strength.

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Section: Microhardnessmentioning

confidence: 87%

“…However, they give an important insight concerning the energy input for the different WD. Gerlich et al 18 reported that the calculated strain rate in FSSW of AA7075-T6 decreases considerably when tool rotational speed increases from 1000 to 3000 rpm, resulting in tool slippage due to a temperature increase in the weld region.…”

mentioning

confidence: 99%

Effect of Heat Input on the Mechanical Behaviour of Al-Cu FSW Lap Joints

et al. 2018

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“…A Figura 5 apresenta um esquema das quatro etapas da variante "penetração da camisa". Embora a "penetração do pino" seja executada com maior facilidade por demandar intensidades menores de força e torque, o que confere maior vida útil à ferramenta, a "penetração da camisa" fornece uma junta soldada Figura 3 -Aspecto visual e macrografia da seção transversal de uma junta de Al 7075-T6 soldada por FSSW [14].…”

Section: Soldagem Por Fricção Por Pontounclassified

Soldagem por ponto no estado sólido de ligas leves

Campanelli¹,

Alcântara²,

Santos³

2011

Soldag. insp.

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Resumo A recente preocupação quanto às mudanças climáticas vem impulsionando pesquisas em eficiência energética dos meios de transportes IntroduçãoA preocupação mundial referente às questões ambientais tem conduzido à busca por soluções que permitam reduzir o consumo de combustíveis e a consequente emissão de gases poluentes pelos meios de transporte. Algumas possibilidades incluem a utilização de fontes renováveis de energia, melhorias na eficiência dos motores e na aerodinâmica e redução de peso, sendo esta última uma excelente opção de custo-benefício [1]. A redução do peso das estruturas está diretamente relacionada à utilização de materiais leves que apresentem uma alta resistência específica. As ligas de alumínio (Al) e de magnésio (Mg) se apresentam como opções naturais em função dos baixos valores de densidade, além de apresentarem excelente usinabilidade e possibilidade de reciclagem.Os atributos das ligas de Al e Mg são de grande interesse das indústrias automobilística e aeronáutica, porém o emprego de tais materiais torna-se muitas vezes inviável em função da dificuldade de união. Algumas características metalúrgicas intrínsecas dificultam a obtenção de uma junta de alta qualidade por meio de processos convencionais de soldagem. Dado o potencial de aplicação, novas alternativas de processamento vem sendo estudadas nas últimas décadas. Desenvolvida em 1991 pelo The Welding Institute (TWI) na Inglaterra [2], a tecnologia de soldagem por fricção e mistura (Friction Stir Welding, FSW) tem sido aplicada com sucesso na união de diversas ligas metálicas, incluindo metais dissimilares. O processo, realizado no estado sólido, envolve essencialmente calor por fricção e deformação plástica severa, decorrentes da interação entre uma ferramenta não-consumível e a superfície da peça a ser soldada [3].O fato de ser um processo no estado sólido elimina uma série de limitações associadas aos processos que envolvem a fusão

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“…[21][22][23] However, few studies have focused on FSW and most of these were related to friction stir spot welding. [24][25][26] These studies reported that liquation or partial melting during FSW occurred at the surface in direct contact with the tool shoulder and not at the interior of the weld zone or base materials. If liquation cracking occurs during FSW of specific Al alloys, it must be considered to control and choose welding parameters, such as shoulder dimension, backing material, cooling device, tool rotation speed, peak temperature and etc.…”

Section: Tensile Properties and Fracture Analysismentioning

confidence: 99%

Effect of Welding Parameters on Weld Formation and Mechanical Properties in Dissimilar Al Alloy Joints by FSW

et al. 2010

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The dissimilar Al alloys, 5052 and 5J32, were joined by friction stir welding (FSW) technique under several welding conditions, including material arrangement. The tool rotation speeds were 1000 and 1500 rpm, and the welding speeds were varied within the range from 100 to 400 mm/min. At a tool rotation speed of 1000 rpm, all joints with the 5052 on the advancing side exhibited better properties than those with the opposite arrangement. When the 5J32 was placed on the advancing side, defect-free welds were obtained under all welding conditions. However, when the 5J32 was placed on the retreating side with a rotation speed of 1500 rpm, some defects were detected below the top surface of the retreating side. Furthermore, fractographs of the defects indicated an evidence of liquation cracking during FSW. The experimental results showed that the weld formation and mechanical properties depended upon the material arrangement as well as the conventional welding parameters.

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Stir zone microstructure and strain rate during Al 7075-T6 friction stir spot welding

Cited by 150 publications

References 32 publications

Effect of Heat Input on the Mechanical Behaviour of Al-Cu FSW Lap Joints

Effect of Heat Input on the Mechanical Behaviour of Al-Cu FSW Lap Joints

Soldagem por ponto no estado sólido de ligas leves

Effect of Welding Parameters on Weld Formation and Mechanical Properties in Dissimilar Al Alloy Joints by FSW

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