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Quality and Properties of the Friction Stir Welded AA2024-T4 Aluminium Alloy at Different Welding Conditions

  • Hakan Aydin
Veröffentlicht/Copyright: 28. Mai 2013
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Materials Testing
Aus der Zeitschrift Materials Testing Band 52 Heft 9

Abstract

The effect of welding parameters on weld quality and joint properties of friction stir welds in the high strength aluminium alloy AA2024 in T4 temper state was investigated in the present work. The employed rotating speeds of the tool were 1520 and 2140 rpm, while the advancing selected speeds were 40, 56, 112, 160 and 224 mm/min. The microstructural evolution of the joints was analysed by optical and scanning electron microscopy (SEM) observations of the welds cross sections. The mechanical properties of the joints were evaluated by means of microhardness (HV0.05) and tensile tests at room temperature. Also, the fracture surfaces of the tensile tested specimens were characterised using SEM. In all cases, the minimum microhardness values were observed in the thermo-mechanically affected zone (TMAZ) / heat affected zone (HAZ) boundary. The microhardness values in the TMAZ and HAZ of the joints decreases with increasing the heat input. Some welding defects such as porosity in the stir zone of the joints fabricated with the advancing speeds of 112, 160, and 224 mm/min at 2140 rpm were observed, whilst defect free welds were obtained with the advancing speeds of 40 and 56 mm/min at 1520 and 2140 rpm. The stirring defects decreases with increasing the heat input. All joints obtained with different welding parameters exhibited reduced strength and ductility compared with the base metal. 2024-T4 aluminium alloy plates friction stir welded at a tool advancing speed of 40 and 56 mm/min at 2140 rpm exhibited higher tensile strength and ductility, whereas lowest tensile properties were observed for samples welded at a higher tool advancing speeds of 112, 160, and 224 mm/min at 2140 rpm.

Kurzfassung

Für den vorliegenden Beitrag wurde die Wirkung der Schweißparameter auf die Nahtqualität und die Eigenschaften von Rührreibschweißungen der hochfesten Aluminiumlegierung AA2024 im getemperten Zustand T4 untersucht. Als Rotationsgeschwindigkeiten wurden 1520 und 2140 U/min gewählt, während die Vorschubgeschwindigkeiten 40, 56, 112, 160 and 224 mm/min betrugen. Die mikrostrukturelle Ausbildung der Schweißungen wurde mittels Licht- und Rasterlektronenmikroskopie (REM) der Nahtquerschnitte analysiert. Die mechanischen Eigenschaften wurde anhand der Mikrohärte HV0.05 and Zugversuchen bei Raumtemperatur evaluiert. Außerdem wurden die Bruchoberflächen der Zugproben mittels REM charakterisiert. In allen Fällen wurden die niedrigsten Mikrohärtewerte an der Grenze zwischen der thermo-mechanisch beeinflussten Zone (thermo-mechanically affected zone — TMAZ) und der wärmebeeinflussten Zone (WEZ) (heat affected zone — HAZ) beobachtet. Die Mikrohärte in diesem Bereich nahm mit zunehmender Streckenenergie ab. Einige Defekte, wie Porösität wurden in der Rührzone der Schweißungen festgestellt, die mit Vorschubgeschwindigkeiten von 112, 160 und 224 mm/min bei 2140 U/min gefertigt wurden. Hingegen konnten defektfreie Schweißungen bei Vorschubgeschwindigkeiten von 40 und 56 mm/min bei 1520 und 2140 U/min hergestellt werden. Die Rührdefekte nahmen mit zunehmender Streckenenergie ab. Alle Verbindungen wiesen bei den verschiedenen Schweißparametern eine verminderte Festigkeit und Zähigkeit gegenüber dem grundwerkstoff auf. Die Bleche der Aluminiumlegierung AA2024-T4, die mit einer Vorschubgeschwindigkeit von 40 und 56 mm/min bei 2140 U/min geschweißt wurden, wiesen eine höhere Festigkeit und Zähigkeit auf, während die niedrigsten Festigkeitseigenschaften bei Proben festgestellt wurden, die bei höheren Vorschubgeschwindigkeiten von 112, 160 und 224 mm/min bei 2140 U/min geschweißt wurden.

Dr. Hakan Aydin, born in 1976, completed his primary and secondary education in Bursa. He graduated from department of Mechanical Engineering of Engineering and Architecture Faculty, Uludag University-Bursa, Turkey in 2000. He has worked as a Research and Teaching Assistant in Mechanical Engineering at Uludag University since 2000. He received his Ph.D. in Mechanical Engineering from Uludag University in 2008. His research focuses on surface modifications of steels (boronizing, plasma nitriding etc.), heat treatments of steels, Al-alloys and their heat treatments, tribology, friction stir welding of the age- hardenable Al-alloys.

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Published Online: 2013-05-28
Published in Print: 2010-09-01

© 2010, Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Inhalt/Contents
  2. Inhalt
  3. Fachbeiträge/Technical Contributions
  4. Herausforderungen bei der Charakterisierung neuer Stähle*
  5. Ein neues Prüfverfahren zur Untersuchung der Rissbildung beim Feuerverzinken von Stahl*
  6. Werkstoffverhalten einer TRIP/TWIP-fähigen CrMnNi-Stahlgusslegierung bis zu hohen Dehnraten*
  7. Erweiterte Werkstoffprüfverfahren zur Charakterisierung von Leichtbaublechwerkstoffen im Hinblick auf die Kantenrisssensitivität*
  8. Analysis Techniques for Eddy Current Imaging of Carbon Fiber Materials*
  9. Hydrogen Influence on the Mechanical Behaviour of High Strength Steel
  10. Procedures for Corrosion Testing and Corrosion Failure Analysis
  11. Entwicklung von aufwandsoptimierten Prüfmethoden zur Charakterisierung und Harshnessbeurteilung von Luftfedern
  12. Residual Stress Relaxation and Surface Hardness of a 2024-t351 Aluminium Alloy
  13. Quality and Properties of the Friction Stir Welded AA2024-T4 Aluminium Alloy at Different Welding Conditions
  14. Vorschau/Preview
  15. Vorschau
https://doi.org/10.3139/120.110172

Artikel in diesem Heft

  1. Inhalt/Contents
  2. Inhalt
  3. Fachbeiträge/Technical Contributions
  4. Herausforderungen bei der Charakterisierung neuer Stähle*
  5. Ein neues Prüfverfahren zur Untersuchung der Rissbildung beim Feuerverzinken von Stahl*
  6. Werkstoffverhalten einer TRIP/TWIP-fähigen CrMnNi-Stahlgusslegierung bis zu hohen Dehnraten*
  7. Erweiterte Werkstoffprüfverfahren zur Charakterisierung von Leichtbaublechwerkstoffen im Hinblick auf die Kantenrisssensitivität*
  8. Analysis Techniques for Eddy Current Imaging of Carbon Fiber Materials*
  9. Hydrogen Influence on the Mechanical Behaviour of High Strength Steel
  10. Procedures for Corrosion Testing and Corrosion Failure Analysis
  11. Entwicklung von aufwandsoptimierten Prüfmethoden zur Charakterisierung und Harshnessbeurteilung von Luftfedern
  12. Residual Stress Relaxation and Surface Hardness of a 2024-t351 Aluminium Alloy
  13. Quality and Properties of the Friction Stir Welded AA2024-T4 Aluminium Alloy at Different Welding Conditions
  14. Vorschau/Preview
  15. Vorschau
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