Enhanced mechanical properties of friction stir welded dissimilar Al–Cu joint by intermetallic compounds

Xue, P.; Xiao, B.L.; Ni, D.R.; Ma, Zheng

doi:10.1016/j.msea.2010.05.061

Cited by 276 publications

(147 citation statements)

References 20 publications

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“…In order to counteract the difference in flow stress and melting temperature between the two materials, the tool is usually shifted towards the aluminium. Xue et al [27] recommend that no active stirring between Al and Cu takes places, only leaving a small diffusion layer of approximately 3 µm which contributes to the joint strength. Otherwise, large copper particles and fragments are pulled into the stirring zone, which results in significant void and IMC formation.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pin Length and Electrochemical Platings on the Mechanical Strength and Macroscopic Defect Formation in Stationary Shoulder Friction Stir Welding of Aluminium to Copper

Regensburg

Schürer

Weigl³

et al. 2018

Metals

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Abstract:The fabrication of dissimilar joints for electrical applications raises challenges for conventional joining technologies. Within solid-state processes, friction stir welding (FSW) provides numerous advantages to realize different joint configurations. However, depending on the intermixing of the materials, defects like hooking and significant intermetallic compound formation around copper fragments are observed and lead to a decrease in joint properties. Therefore, stationary shoulder FSW was applied to produce 2 mm EN AW1050/CW024A lap joints with minimized intermixing at the interface. Compared to conventional FSW, the range of the friction-based heat input can be increased without risking excessive plastification under the tool shoulder. The influence of the pin length on the interfacial structure as well as the mechanical properties were investigated. A pin length of 2.2 mm and hence a plunging of approximately 0.2 mm into the lower copper sheet was found to obtain the highest failure load. A further increase caused the formation of hooking defects, which led to void formation at the interface and failure within the area of the thinned aluminium sheet. The results were also transferred to lap joints with a tin and silver interlayer of 10 µm and also showed good results in terms of bond strength and contact area.

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Section: Introductionmentioning

confidence: 99%

Influence of Pin Length and Electrochemical Platings on the Mechanical Strength and Macroscopic Defect Formation in Stationary Shoulder Friction Stir Welding of Aluminium to Copper

Regensburg

Schürer

Weigl³

et al. 2018

Metals

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“…Esta técnica permitió la obtención de juntas soldadas con unión metalúrgica y ductilidad adecuada, gracias a la formación de una capa fina y homogénea de CIM, con espesor entre 5 y 10 μm (Zhang et al, 2009;Cao et al, 2013;Lin et al, 2013). Este resultado coincide con la afirmación de algunos autores que sostienen que es necesaria la formación de una capa fina de CIM que garantice la unión metalúrgica de ambos materiales, con un espesor tal que no comprometa substancialmente la ductilidad (Xue, et al, 2010;Zhang et al, 2011).…”

Section: Introductionunclassified

Inhibition of the formation of intermetallic compounds in aluminum-steel welded joints by friction stir welding

López¹,

Ramírez²

2015

REVMETAL

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RESUMEN:La unión de juntas aluminio-acero, sin la formación de fases deletéreas del tipo Fe x Al y , ha sido, por décadas, un desafío para los procesos de soldadura. La soldadura por fricción-agitación ha sido empleada para intentar reducir el aporte térmico y evitar la formación de compuestos intermetálicos. Usando esta técnica fueron soldadas juntas disimilares de aluminio 6063-T5 y acero AISI-SAE 1020. La soldadura fue acompañada de medidas de temperatura durante su ejecución. La interfase de las juntas soldadas fue caracterizada utilizando microscopía óptica, electrónica de barrido y electrónica de transmisión. Adicionalmente fueron realizadas medidas puntuales X-EDS y DRX. Los resultados experimentales revelan que la temperatura máxima en la junta es inferior a 360 °C. La caracterización microestructural en la interfase aluminio-acero demostró la ausencia de compuestos intermetálicos, condición atribuida al uso de parámetros de soldadura con bajo aporte térmico. ABSTRACT: Inhibition of the formation of intermetallic compounds in aluminum-steel welded joints by friction stir welding.Formation of deleterious phases during welding of aluminum and steel is a challenge of the welding processes, for decades. Friction Stir Welding (FSW) has been used in an attempt to reduce formation of intermetallic compounds trough reducing the heat input. In this research, dissimilar joint of 6063-T5 aluminum alloy and AISI-SAE 1020 steel were welded using this technique. The temperature of welded joints was measured during the process. The interface of the welded joints was characterized using optical microscopy, scanning and transmission electron microscopy. Additionally, composition measurements were carried out by X-EDS and DRX. The experimental results revealed that the maximum temperature on the joint studied is less than 360 °C. The microstructural characterization in the aluminum-steel interface showed the absence of intermetallic compounds, which is a condition attributed to the use of welding with low thermal input parameters.

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“…In tensile test, the fracture occurred in the interface at 52.5 MPa. That means the intermetallic compound that supposed to play the ro le o f the bonding is very brittle and has tensile strength lower than the tensile strength of the stirring zone and HAZ [ 8]. Fig.…”

Section: Sem Examinationmentioning

confidence: 98%

Process Parameters Optimization for Friction Stir Welding of Pure Aluminium to Brass (CuZn30) using Taguchi Technique

Elfar

Rashad

Megahed

2016

MATEC Web of Conferences

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Abstract. In this research, the friction stir welding of dissimilar commercial pure aluminium and brass (CuZn30) plates was investigated and the process parameters were optimized using T aguchi L9 orthogonal array. T he considered process parameters were the rotational speed, traverse speed and pin offset. The optimum setting was determined with reference to ultimate tensile strength of the joint. The predicted optimum value of ultimate tensile strength was confirmed by experimental run using optimum parameters. Analysis of variance revealed that traverse speed is the most significant factor in controlling the joint tensile strength and pin offset also plays a significant role. In this investigation, the optimum tensile strength is 50% of aluminium base metal. Metallographic examination revealed that intermetallic compounds were formed in the interface of the optimum joint where the tensile failure was observed to take place.

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Enhanced mechanical properties of friction stir welded dissimilar Al–Cu joint by intermetallic compounds

Cited by 276 publications

References 20 publications

Influence of Pin Length and Electrochemical Platings on the Mechanical Strength and Macroscopic Defect Formation in Stationary Shoulder Friction Stir Welding of Aluminium to Copper

Influence of Pin Length and Electrochemical Platings on the Mechanical Strength and Macroscopic Defect Formation in Stationary Shoulder Friction Stir Welding of Aluminium to Copper

Inhibition of the formation of intermetallic compounds in aluminum-steel welded joints by friction stir welding

Process Parameters Optimization for Friction Stir Welding of Pure Aluminium to Brass (CuZn30) using Taguchi Technique

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