Accessible Requires Authentication Published by De Gruyter April 14, 2015

Mechanical characterization by DOE analysis of AA6156-T4 friction stir welded joints in as-welded and post-weld aged condition

Mechanische Charakterisierung mittels DOE Analyse von AA 6156-T4 rührreibgeschweißten Verbindungen im geschweißten und nachträglich gealtertem Zustand
Antonello Astarita, Umberto Prisco, Antonino Squillace, Carla Velotti and Aurelio Tronci
From the journal Materials Testing

Abstract

Tensile properties of AA6156-T4 friction stir welded joints were studied in the as-welded and T62 post-weld heat treated condition. To analyze the influence of rotating and welding speed on the 0.2 % proof stress and tensile strength of the two classes of joints, a complete full factorial design with three levels for each studied parameter was performed. Statistical analyses were carried out to establish empirical models of the tensile properties of the joints as a function of the studied welding parameters. The obtained models were validated by statistical tools such as Mallow's CP, S, R2 and R2(adj). The developed regression models can be effectively used to predict the mechanical properties of the joints at 95 % confidence level.

Kurzfassung

Für den vorliegenden Beitrag wurden die mechanischen Eigenschaften von AA 6156-T4 rührreibgeschweißten Verbindungen im geschweißten und im T62 nachträglich gealtertem Zustand untersucht. Um den Einfluss der Rotations- und Schweißgeschwindigkeit auf die 0,2 % – Dehngrenze und die Zugfestigkeit der beiden Schweißverbindungsklassen zu analysieren, wurde eine komplette Versuchsplanung mit drei Größen für jeden untersuchten Parameter ausgeführt. Es wurden statistische Analysen durchgeführt, um die empirischen Modelle für die Festigkeitseigenschaften der Verbindungen als Funktion der untersuchten Schweißparameter nachzuweisen. Die so gewonnenen Modelle wurden mittels statistischer Werkzeuge, wie zum Beispiel Mallow's CP, S, R2 und R2(adj), validiert. Die entwickelten Regressionsmodelle können effektiv verwendet werden, um die mechanischen Eigenschaften der Verbindungen mit einer 95 %-igen Zuverlässigkeit vorherzusagen.


§Correspondence Address, Dr. Umberto Prisco, Department of Chemical, Materials and Production Engineering, University of Napoli Federico II, Piazzale Tecchio, 80, 80125 Napoli, Italy,

Dr. Antonello Astarita is a research fellow at the Department of Chemical, Materials and Industrial Manufacturing Engineering at the University of Naples Federico II, Italy, and he studies the properties and the manufacturing processes of metals. He holds a doctoral degree in Materials Science from the University of Naples. He was also invited to be Visiting Scientist at the University of Manchester, UK. Furthermore, he works as a consultant for several manufacturing companies. His major research interests are titanium and aluminum alloys as well as the study and development of innovative manufacturing techniques.

Dr. Umberto Prisco is a lecturer in Materials Science and Engineering at the University of Naples Federico II, Italy. He graduated in Chemical Engineering in 1999. In 2003, he obtained his PhD from the Department of Materials and Production Engineering at the University of Napoli Federico II. In 2003, he was research fellow at the Nanoscale Physics Research Laboratory, University of Birmingham, UK. His research interests and publications include aspects of continuum mechanics, metal alloys, composite materials, nanotechnology, tolerancing, metrology and conventional and non-conventional machining.

Assoc. Prof. Dr. Antonino Squillace is Associate Professor at the Department of Chemical, Materials and Industrial Production Engineering of the University of Naples Federico II, Italy. His research activity is mainly focused on innovative manufacturing process of medium and light alloys, solid state welding techniques and non-destroying evaluation via infrared thermography. He is responsible for several research projects financed by Italian Ministry of Education, Research and University.

Carla Velotti is a PhD student at the Department of Chemical, Materials and Industrial Production Engineering of the University of Naples Federico II, Italy. She is working in the materials science field, with particular interest on metallic materials and welding technologies. Furthermore, she is interested in roughness study.

Dr. Aurelio Tronci is a research fellow at the University of Cagliari, Italy, and he studies the properties and the manufacturing processes of metals. He holds a doctoral degree in Materials Science at the University of Cagliari, he also worked at the University of Coimbra, Portugal, as Research Associate. His major research interests are titanium and aluminum alloys as well as the study and development of innovative manufacturing techniques.


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Published Online: 2015-04-14
Published in Print: 2015-03-02

© 2015, Carl Hanser Verlag, München