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The Effect of Welding Parameters on the Microstructure and Mechanical Properties of Friction Stir Welded AA 7075

Published/Copyright: May 20, 2013
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Abstract

In this study, aluminum alloy 7075 (AA 7075) has been friction stir welded by using three different rotation speeds and two different welding speeds. The aim is to determine the optimum welding parameters concerning these two variables for AA 7075. Microstructural examination, hardness measurements and room temperature tensile tests have been carried out in order to determine the optimum combination. The results show that higher rotation speeds have yielded higher mechanical properties. Some porosity has been obtained for the lowest rotation speed.

Kurzfassung

In der vorliegenden Arbeit wird die Aluminium-legierung 7075 (AA 7075) durch Rührreibschweißen mit drei unterschiedlichen Rotationsgeschwindigkeiten und zwei unterschiedlichen Schweißgeschwindigkeiten gefügt. Das Ziel ist die Bestimmung der optimalen Schweißparameter für diese beiden Variablen bei AA 7075. Durchgeführt wurden Gefügeuntersuchungen, Härtemessungen und Zugversuche bei Raumtemperatur zur Bestimmung der optimalen Kombination. Das Ergebnis zeigt, dass höhere Rotationsgeschwindigkeiten bessere mechanische Eigenschaften hervorbringen. Bei der geringsten Rotationsgeschwindigkeit zeigte sich eine geringe Porosität.


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Dr. Çinar Yeni is an Assistant Professor in DEU. She has carried out her M. Sc. & Ph. D. experimental studies in GKSS Research Center, Germany, where afterwards she has participated to European projects on fatigue and fracture assessment of welded joints. She is also specialized in welding methods such as laser beam and friction stir welding.


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Received: 2007-8-23
Accepted: 2008-1-24
Published Online: 2013-05-20
Published in Print: 2008-10-01

© 2008, Carl Hanser Verlag, München

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