Home Kovove Materialy-Metallic Materials 2019 Kovove Materialy-Metallic Materials Vol. 57 (2019), no. 5, pp.329–342

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Kovove Materialy-Metallic Materials Vol. 57 (2019), no. 5, pp.329–342

Title: Cyclic lateral behavior of friction stir spot welds of AA2219 aluminum alloy: impact of inherent flow defects
Author: O. O. Ojo, E. Taban, E. Kaluc, A. Sik
Abstract: Structural damage and fatigue life of engineering materials are controlled by inherent defects
and the nature, level, and location of applied external loads. This paper studies the effect
of cyclic lateral loads on the pinless and conical-pin assisted friction stir spot welds of AA2219
alloy. The results reveal the presence of upward-flow induced hook defect and outstretchingflow
induced microscopic toe-notch in the conical pin and pinless welds, respectively. Extruded
flash root contributed to the fracture pattern of the conical pin welds while it did not influence
the fracture of the pinless weld. Grain refinement, microhardness, and microscopic toe-notch
affect the fracture mode of pinless weld whereas complex fracture morphology ensues in conical
pin weld. A decrease in the cyclic lateral stress level improves the lateral fatigue lives of both
weld categories. Lateral fatigue improvement of welds requires the minimization of inherent
nugget defects and extruded flash.
Keywords: friction stir spot welding, cyclic lateral behavior, fatigue, pinless weld, conical pin weld, fracture
Published online: 09-Sep-2019
Year: 2019, Volume: 57, Issue: 5 Page From: 329, Page To: 342
doi:10.4149/km_2019_5_329


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