Friction Stir Welding of 7075-T651 Aluminium Alloy
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Bekir Çevik has been working at Department of Welding Technology of Düzce University. His research interest is in materials science, mainly residual stress, welding.Yusuf Özçatalbaş has been working at Dept. of Metallurgy & Material Eng. of Gazi University. His research interest is in materials science, mainly in the powder metallurgy, welding and residual stress.
Abstract
The microstructural changes, mechanical properties and residual stress distribution of 7075-T651 Al alloy joined using friction stir welding were investigated in this study. Welding was performed at 900, 1 250, and 1 600 rev/min and 20, 40, and 60 mm/min welding speeds. Mechanical tests were carried out on the welded joints in addition to microstructural examinations performed using a scanning electron microscope. Furthermore, residual stress distribution of the joints was determined by the hole drilling method. Generally, higher tensile strength was obtained at medium rotational and welding speeds. Tunnel defects were formed in the root of the weld seam. At high welding speeds, insufficient filling in the joints led to microvoids and large grain bands on the retreating side of the weld seam. The tensile strength of the welded specimens decreased at the rate of 26 – 45 % compared to the reference material. Lower residual stresses were determined in the specimens joined at a high rotational speed.
Kurzfassung
In diesem Beitrag wurden die mikrostrukturellen Veränderungen, die mechanischen Eigenschaften sowie die Eigenspannungsverteilung einer mittels Rührreibschweißen verbundenen 7075-T651-Al-Legierung untersucht. Geschweißt wurde mit 900, 1 250 und 1 600 UpM und Schweißgeschwindigkeiten von 20, 40, and 60 mm/min. Neben mikrostruktuellen Untersuchungen mittels Rasterelektronenmikroskop wurden mechanische Tests an den Schweißverbindungen durchgeführt. Weiterhin wurde anhand der Bohrlochmethode die Eigenspannungsverteilung der Verbindungen bestimmt. Generell wurde bei mittleren Rotations- und Schweißgeschwindigkeiten eine höhere Zugfestigkeit erreicht. In der Wurzel der Schweißnaht bildeten sich Tunneldefekte. Bei hohen Schweißgeschwindigkeiten führte eine unzureichende Befüllung in den Verbindungen zu Mikroporen und großen Kornbreitenbändern auf der Rückseite der Schweißnaht. Im Vergleich zum Referenzmaterial nahm die Zugfestigkeit der geschweißten Proben bei einer Rate von 26 – 45 % ab. In den Proben, die mit einer hohen Rotationsgeschwindigkeit verbunden wurden, war die Eigenspannung geringer.
About the authors
Bekir Çevik has been working at Department of Welding Technology of Düzce University. His research interest is in materials science, mainly residual stress, welding.
Yusuf Özçatalbaş has been working at Dept. of Metallurgy & Material Eng. of Gazi University. His research interest is in materials science, mainly in the powder metallurgy, welding and residual stress.
Acknowledgments
The authors express their thanks to the Gazi University Rectorship Scientific Research Projects Unit for their support of this study (Project No. 07/2012 – 41). In addition, the authors thank to Assoc. Prof. Dr. Aydın Şık for his helpful aid.
Danksagung
Die Autoren danken der Gazi University Rectorship Scientific Research Projects Unit für deren Unterstützung bei dieser Studie (Project No. 07/2012 – 41). Ein weiterer Dank geht an Assoc. Prof. Dr. Aydın Şık für dessen nützliche Hilfe.
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Articles in the same Issue
- Contents
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- Experimental Research on Properties of Naval Brass Castings
- Metallurgical Failure Investigation of a Deformed and Cracked Lashing-Load Ring of a Heavy-Duty Gas Turbine Engine
- Friction Stir Welding of 7075-T651 Aluminium Alloy
- The Influence of Sample Preparation on SEM Measurements of Anodic Oxide Layers
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Articles in the same Issue
- Contents
- Editorial
- Editorial
- Experimental Research on Properties of Naval Brass Castings
- Metallurgical Failure Investigation of a Deformed and Cracked Lashing-Load Ring of a Heavy-Duty Gas Turbine Engine
- Friction Stir Welding of 7075-T651 Aluminium Alloy
- The Influence of Sample Preparation on SEM Measurements of Anodic Oxide Layers
- Picture of the Month
- Top-Ten Article Downloads
- Picture of the Month
- News
- PM-news
- Meeting diary
- Meeting diary
