Abstract
The effect of pin penetration depth on the mechanical properties of friction stir spot welded (FSSW) aluminum alloy 1050 and pure copper has been investigated. For a certian tool geometry, constant tool rotation speed and penetration time, the materials have been friction stir spot welded in three different penetration depths, namely 2.8 mm, 4 mm and 5 mm. Tensile shear tests, microhardness measurements and micostructural investigation have been carried out on the welded specimens in order to investigate the effect of penetration depth. 2.8 mm plunge depth has resulted in a weak joint, whereas 4 mm and 5 mm plunge depths offer acceptable tensile shear results. Presence of intermetallic phases had an influence on the tensile shear and hardness values.
Kurzfassung
Für den vorliegenden Beitrag wurden die Auswirkungen der Eindringtiefe des Pins auf die mechanischen Eigenschaften der rührreibpunktgeschweißten (friction stir spot welded – FSSW) Aluminiumlegierung 1050 und reinem Kupfer untersucht. Bei einer bestimmten Werkzeuggeometrie und einer konstanten Werkzeugdrehgeschwindigkeit sowie Eindringzeit wurden die Werkstoffe mit drei verschiedenen Eindringtiefen rührreibpunktgeschweißt, und zwar 2mm, 8mm, 4mm und 5 mm. Mit den geschweißten Proben wurden Scherzugversuche, Mikrohärtemessungen und Gefügeuntersuchungen durchgeführt, um die Effkte der Eindringtiefe zu untersuchen. Eine Eintauchtiefe von 2,8 mm ergab eine schwache Verbindung. Die Eintauchtiefen 4mm bzw. 5 mm bieten akzeptable Ergebnisse in den Scherzugversuchen. Die Anwesenheit von intermetallischen Phasen hatten einen Einfluß auf Scherzugfestigkeit und Härtewerte.
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