Friction spot joining of an extruded Al–Mg–Si alloy

Lathabai, Srinivasarao; Painter, M. J.; Cantin, G. M. Delphine; Tyagi, Vinay Kumar

doi:10.1016/j.scriptamat.2006.07.046

Cited by 127 publications

(97 citation statements)

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“…This is unexpected. A recent study demonstrated for the first time that macrodeformation twins in high stacking fault energy materials, such as single-crystal Al, are realized at ultrahigh strain rates (~10 6 s À1 ) and large shear strains (2). [35] In the current work, however, the selected region is close to the center, which would most likely not be expected to experience such a high strain rate with a large strain.…”

Section: Recrystallization Mechanismmentioning

confidence: 74%

Texture Development and Material Flow Behavior During Refill Friction Stir Spot Welding of AlMgSc

Shen¹,

Lage

Suhuddin³

et al. 2017

Metall Mater Trans A

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The microstructural evolution during refill friction stir spot welding of an AlMgSc alloy was studied. The primary texture that developed in all regions, with the exception of the weld center, was determined to be h110i fibers and interpreted as a simple shear texture with the h110i direction aligned with the shear direction. The material flow is mainly driven by two components: the simple shear acting on the horizontal plane causing an inward-directed spiral flow and the extrusion acting on the vertical plane causing an upward-directed or downward-directed flow. Under such a complex material flow, the weld center, which is subjected to minimal local strain, is the least recrystallized. In addition to the geometric effects of strain and grain subdivision, thermally activated high-angle grain boundary migration, particularly continuous dynamic recrystallization, drives the formation of refined grains in the stirred zone.

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Section: Recrystallization Mechanismmentioning

confidence: 74%

Texture Development and Material Flow Behavior During Refill Friction Stir Spot Welding of AlMgSc

Shen¹,

Lage

Suhuddin³

et al. 2017

Metall Mater Trans A

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“…Dicha resistencia se ve estrictamente relacionada con los parámetros del proceso y la geometría de la herramienta. Es reportado en la bibliografía como el diámetro del hombro y su forma, la forma del pin, su longitud y diámetro afectan a la generación de calor y al flujo de material plastificado (Lathabai et al, 2006;Tozaki et al, 2007;Tran et al, 2009;Rao et al, 2015). Uniones soldadas libres de defectos y con una buena conformación del punto presentarán una alta carga de arrancamiento en ensayos del tipo Peel Test (PT), con un modo de fractura circunferencial.…”

Section: Introductionunclassified

“…En este mismo sentido, se ha reportado que el aumento de la resistencia de las uniones se obtiene cuando el tamaño de la zona agitada es maximizado, lo cual a su vez se obtiene al soldar con menores velocidades de rotación (Rao et al, 2015). Sin embargo, otros autores aseguran que se debe soldar con elevadas velocidades de rotación, como por ejemplo 3000 RPM, para optimizar la carga de rotura de las uniones soldadas de Aluminio 6060-T5 (Lathabai et al, 2006).…”

Section: Introductionunclassified

Efecto de la velocidad de rotación y la indentación en soldadura de punto por fricción agitación de aleaciones de aluminio disimilares

Piccini

Svoboda

2017

REVMETAL

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RESUMEN:En los últimos años, dentro de a la industria automotriz, se busca introducir partes de aluminio en reemplazo de componentes de acero para la disminución en peso de los vehículos. Estas piezas deben ser unidas entre sí, por ejemplo, mediante soldadura. El proceso de soldadura más utilizado dentro de la industria automotriz es la soldadura de punto por resistencia (RSW). Sin embargo, la soldadura RSW de aleaciones de aluminio presenta desventajas importantes. Dentro de este contexto se ha desarrollado una variante del proceso de soldadura por Fricción Agitación denominado Soldadura de Punto por Fricción Agitación (FSSW), el cual presenta un fuerte interés en relación a la soldadura de aleaciones de aluminio y de materiales disímiles en chapas finas. Los parámetros de soldadura afectan a las características de las juntas obtenidas. Sin embargo, es escasa la información disponible sobre la influencia de estos sobre las características de la unión, en particular para juntas disimilares y en chapa fina. El objetivo de este trabajo fue estudiar el efecto de la velocidad de rotación y la profundidad de indentación de la herramienta sobre las características de uniones disimilares soldadas por FSSW. Uniones soldadas sin defectos pudieron obtenerse con propiedades mecánicas superiores a lo que se reporta hasta el momento. La carga de rotura máxima fue de 5800 N. La longitud efectiva de unión aumentó con la indentación de la herramienta, mientras que la carga de rotura aumenta y luego disminuye. Finalmente, al soldar con 1200 RPM las propiedades mecánicas de las uniones disminuyeron, respecto a lo obtenido con 680 y 903 RPM. ABSTRACT. Effect of tool rotational speed and penetration depth on dissimilar aluminum alloys friction stir spot welds. In the last years, the automotive industry is looking for the use of aluminum parts in replace of steel parts in order to reduce the vehicles weight. These parts have to be joined, for instance, by welding processes. The more common welding process in the automotive industry is the Resistance Spot Welding (RSW) technique. However, RSW of aluminum alloys has many disadvantages. Regarding this situation, a variant of the Friction Stir Welding process called Friction Stir Spot Welding (FSSW) has been developed, showing a strong impact in welding of aluminum alloys and dissimilar materials in thin sheets. Process parameters affect the characteristics of the welded joints. However, the information available on this topic is scarce, particularly for dissimilar joints

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“…2,3) Recently, a new solid-state joining technology of the friction stir spot welding (FSSW), which is a derivative process of the friction stir welding (FSW), 4) has been developed as a widespread technique and successfully applied for producing lap-joints of aluminum alloys. [5][6][7] Compared with the traditional RSW process, FSSW can avoid severe heating and cooling cycles induced during welding process. Furthermore, the heat affected zone (HAZ) and residual stresses associated with the welds are relatively small.…”

Section: Introductionmentioning

confidence: 99%

“…9) Therefore, FSSW as well as FSW is now a simple and indispensable process to acquire better joining strength and vibration fracture resistance for the lightweight structural metals. 6,7,10,11) Since the failure of FSSW-joined structural components depends on the stress to approach a critical weakest link of the welding spot, the variability of failure strength is fairly correlated with the welding qualities of joints, including microstructural homogeneity, bond formation and bond width. [12][13][14] However, few current reports focus on assessing the failure mechanism of FSSW aluminum alloys under mechanical loading for various probe penetration depth.…”

Section: Introductionmentioning

confidence: 99%

Weibull Statistics for Evaluating Failure Behaviors and Joining Reliability of Friction Stir Spot Welded 5052 Aluminum Alloy

et al. 2009

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Friction stir spot welding (FSSW) was applied to make lap-joints of 5052 rolled (5052-R) aluminum alloys. The resulting microstructural observation, microhardness, tensile shear failure load and failure morphologies are reported, including a brief look into failure behaviors in the present study. The metallurgical bonded TMAZ region with a plastic metal flow is obviously created around the probe, and the microhardness is significantly increased at the TMAZ region for FSSW-joined 5052 aluminum alloys. The FSSW lap-joints with an obvious metallurgical bonded TMAZ region generally display a higher failure load and ductile failure morphologies with dimples fracture. In addition, the failure load of FSSW lap-joints was increased with increasing the probe penetration depth and the welding time. Based on the data fluctuation of tensile shear failure load, the Weibull model provided a statistical analysis method for assessing the minimum failure, the failure mechanism and the joining reliability for the FSSW lap-joints. Through the statistical analysis of the Weibull distribution function, FSSW-joined aluminum alloys with a wear-out failure model are recognized as reliable lap-joints for further engineering application.

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Friction spot joining of an extruded Al–Mg–Si alloy

Cited by 127 publications

References 0 publications

Texture Development and Material Flow Behavior During Refill Friction Stir Spot Welding of AlMgSc

Texture Development and Material Flow Behavior During Refill Friction Stir Spot Welding of AlMgSc

Efecto de la velocidad de rotación y la indentación en soldadura de punto por fricción agitación de aleaciones de aluminio disimilares

Weibull Statistics for Evaluating Failure Behaviors and Joining Reliability of Friction Stir Spot Welded 5052 Aluminum Alloy

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