Lap shear strength and fatigue life of friction stir spot welded AZ31 magnesium and 5754 aluminum alloys

Chowdhury, Sohini; Chen, D.L.; Bhole, S.D.; Cao, X.; Wanjara, P.

doi:10.1016/j.msea.2012.07.019

Cited by 97 publications

(53 citation statements)

References 50 publications

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“…[19,22,27,41]. While a fundamentally different type of joint, Chowdhury et al [30,42] Figure 12c (area Z1) shows voids formed due to insufficient material mixing on the RS of the weld in the aluminum sheet. Fatigue striations can be seen close to the void and the bold arrows indicate the crack propagation direction.…”

Section: Fatigue and Fracturementioning

confidence: 97%

“…In one of the few existing studies on the fatigue of dissimilar FSW joints [30], the fatigue life of friction stir spot welded (FSSW) dissimilar magnesium-to-aluminum joints was much lower than the fatigue life of similar FSSW joints. The other work on the fatigue behavior of dissimilar friction stir welded joints is largely based on the joining of dissimilar aluminum-to-aluminum alloys [31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

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Fatigue and fracture of friction stir linear welded dissimilar aluminum-to-magnesium alloys

Rao

Jordon

Ghaffari

et al. 2016

International Journal of Fatigue

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A comprehensive study of fatigue life and damage mechanisms of friction stir linear welded dissimilar aluminum-to-magnesium alloys in lap-shear configuration is presented. The overlap linear welds were created by welding AA6022 aluminum alloy to AM60B magnesium alloy. The test results showed significant scatter in the fatigue life and the corresponding fracture modes. Two distinct modes of failure were observed for the lap-shear specimens. In one of the failure modes observed, fracture occurred when the dominant fatigue crack propagated into either the magnesium or aluminum sheet in a kink-crack formation. In addition, fretting debris was found at locations of crack initiation for this fracture mode. In the other observed mode of failure, fracture occurred by interfacial weld separation, where fractography analysis suggests that the fatigue cracks initiated at weld defects and then propagated through the brittle intermetallic phase formed during welding.2

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Section: Fatigue and Fracturementioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Fatigue and fracture of friction stir linear welded dissimilar aluminum-to-magnesium alloys

Rao

Jordon

Ghaffari

et al. 2016

International Journal of Fatigue

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“…La zona más relevante desde el punto de vista microestructural es la asociada al hook, dado que por allí se espera que se propague el frente de fractura interfacial. En el mismo sentido, se ha reportado previamente que existen míni-mas diferencias en los valores de dureza asociados a las chapas superior e inferior de una junta solapada (Chowdhury et al, 2012). Finalmente, dada la relación de espesores de las chapas siendo soldadas, la fractura seria interfacial (propagándose desde el hook hasta la pared lateral del pin) o circunferencial (propagándose desde el hook hasta la superficie libre de la chapa superior).…”

Section: Microdureza Vickersunclassified

“…6b). Este comportamiento está relacionado con el efecto que el ciclo termomecánico de la soldadura tiene sobre el material base (el cual se encontraba en una condición H32), produciendo algún grado de recristalización (Ferjutz y Davis, 1993;Jenney y O'Brien, 2001;Mishra y Mahoney, 2007;Chowdhury et al, 2012;Jeon et al, 2012).…”

Section: Microdureza Vickersunclassified

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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“…[3][4][5][6][7][8] Hence, it is fairly challenging to weld aluminium and magnesium alloys together by traditional fusion welding technologies. 9 Friction stir welding (FSW, invented by TWI, UK in 1991) 10 has a great advantage in welding light metals (e.g. aluminium alloys and magnesium alloys) as it can avoid the problems frequently occurring in traditional fusion welding of light metals.…”

Section: Introductionmentioning

confidence: 99%

Preheating friction stir spot welding of Mg/Al alloys in various lap configurations

Shen

Zhang

et al. 2015

Science and Technology of Welding and Joining

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The influence of different lap configurations and preheating process on the macro-/microstructures and mechanical properties of friction stir spot welding welds with both similar and dissimilar materials (6061-T6 aluminium alloy and AZ31B magnesium alloy) was investigated. The results showed that the different lap configurations resulted in different macro-/microstructures and mechanical properties of welds. Defect free welds and intermetallic compound containing welds were obtained in configurations of similar (Mg/Mg and Al/Al) and dissimilar (Mg/Al and Al/ Mg) respectively. The welds with similar materials had the highest tensile shear strengths, followed by the Mg/Al welds; the Al/Mg welds had the lowest strength. The preheating process improved the tensile shear strengths of Mg/Mg, Al/Al and Mg/Al welds and reduced that of Al/Mg welds respectively.

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Lap shear strength and fatigue life of friction stir spot welded AZ31 magnesium and 5754 aluminum alloys

Cited by 97 publications

References 50 publications

Fatigue and fracture of friction stir linear welded dissimilar aluminum-to-magnesium alloys

Fatigue and fracture of friction stir linear welded dissimilar aluminum-to-magnesium alloys

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

Preheating friction stir spot welding of Mg/Al alloys in various lap configurations

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