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Effect of residual Alclad on friction stir spot welds of AA2219 alloys

  • Olatunji Oladimeji Ojo , Emel Taban und Erdinc Kaluc
Veröffentlicht/Copyright: 26. September 2018
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Materials Testing
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Abstract

This paper aims to determine the role of in-nugget/residual Alclad in the friction stir spot welds of 1.6 mm thick Alclad AA2219 aluminum alloy via an assessment of microstructure, mechanical properties and fracture modes of welds. Alclad redistribution/dispersion within the stir zone of the alloy is varied by using different tool profiles (pinless and conical pin tools) and welding parameter combinations. The results reveal that a pinless tool facilitates the retention of Alclad within the weld's effective joint line/width while no substantial residual Alclad is observed in the effective bonded width of a conical pin weld. The increase in tool depth improves the weld strength of a pinless weld. The fracture morphology of a pinless weld is influenced by the in-nugget Alclad content. Interfacial fracture with midpoint defect, interfacial fracture and nugget pull-out are the fracture modes of pinless welds while a conical pin weld fails by circumferential nugget shear failure. A direct correlation exists between nugget rotation and lap shear failure load. Maximum lap shear failure loads of 4.0 kN and 2.1 kN are obtained in pinless and conical pin welds at the optimum welding parameter combinations of 1500 rpm – 0.8 mm – 8 s and 1400 rpm – 0.43 mm – 4 s, respectively.

Kurzfassung

Diese Arbeit zielt darauf ab, die Rolle von innenliegenden Nugget/Rest-Alclad in Rührreibpunktschweißungen von 1,6 mm dicker Alclad-AA2219-Aluminiumlegierung über die Bewertung der Mikrostruktur, der mechanischen Eigenschaften und der Brucharten von Schweißnähten zu bestimmen. Die Umverteilung/Dispergierung von Alclad innerhalb der Rührzone der Legierung wird durch Verwendung verschiedener Werkzeugprofile (stiftlose und konische Stiftwerkzeuge) und Schweißparameterkombinationen variiert. Die Ergebnisse zeigen, dass das stiftlose Werkzeug die Retention von Alclad innerhalb der effektiven Fugenlinie/-breite der Schweißnaht fördert, während kein wesentliches restliches Alclad in der effektiven gebundenen Breite der Schweißnaht mit konischem Stiftwerkzeug beobachtet wird. Die Vergrößerung der Werkzeugtiefe verbessert die Schweißnahtfestigkeit von stiftlos erzeugten Schweißnähten. Die Bruchmorphologie der stiftlos erzeugten Schweißnaht wird durch den Gehalt innenliegender Alclad-Nuggets beeinflusst. Grenzflächenbruch mit Mittelpunktdefekt, Grenzflächenbruch und Nuggetausreißen sind die Bruchmodi von stiftlosen Schweißnähten, während konische Stiftschweißung infolge umlaufender Nuggetscherung versagen. Es besteht eine direkte Korrelation zwischen der Drehung der Nuggets und der Zugscherbruchlast. Die maximale Zugscherbruchlast. von 4,0 kN und 2,1 kN werden für stiftlos und mit konischem Stiftwerkzeug erzeugten Schweißnähten bei den optimalen Schweißparameterkombinationen von 1500 U/min – 0,8 mm – 8 s und 1400 U/min – 0,43 mm – 4 s erreicht.

*Correspondence Address, Prof. Dr. Emel Taban, Kocaeli University, Engineering Faculty, Dept. of Mechanical Engineering, 41380, Kocaeli, Izmit, Turkey, E-mail: ,

Dr. Olatunji Oladimeji Ojo, born in 1983, worked as a research assistant from 2010 to 2012 and presently holds the position of Assistant Lecturer at the Federal University of Technology Akure, Ondo State, Nigeria. He obtained his BS in mechanical engineering and MSc in production engineering option from the school of engineering and engineering technology, the Federal University of Technology, Akure, Nigeria in 2008 and 2012, respectively. He completed his PhD in 2016 at Kocaeli University, Turkey. His current research interest covers welding engineering technologies and material characterizations.

Prof. Dr. Emel Taban, born in 1980, received her BS, MSc and PhD in Mechanical Engineering in 2002, 2004 and 2007, respectively. She has been working as Professor in the Department of Mechanical Eng. at Kocaeli University, Turkey and is the Vice Director of the Welding Research Center. She has over 100 publications and books on welding technologies, weldability and welding metallurgy of stainless steels, high alloyed steels and aluminum alloys using conventional and advanced welding processes.

Prof. Dr. Erdinc Kaluc, born in 1958, received his BS, MSc and PhD in Mechanical Engineering in 1980, 1982 and 1988, respectively. He has 30 years of experience and over 200 publications in welding technologies, welding metallurgy and welding of stainless steels, HSLA steels and aluminum alloys. He has been working as Professor in the Department of Mechanical Engineering at the University of Kocaeli, Turkey since 1997 and serves as Director of Welding Research Center.

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Published Online: 2018-09-26
Published in Print: 2018-10-27

© 2018, Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Inhalt/Contents
  2. Contents
  3. Laudatio
  4. Professor Dr.-Ing. Harald Zenner: on the occasion of his eightieth birthday
  5. Fachbeiträge/Technical Contributions
  6. Fatigue life curve – A continuous Wöhler curve from LCF to VHCF
  7. On the accuracy of estimating fatigue notch factors
  8. Analytical strength assessments of austempered ductile iron components
  9. On the estimation of cyclic material properties – Part 1: Quality of known estimation methods
  10. On the estimation of cyclic material properties – Part 2: Introduction of a new estimation method
  11. Execution and evaluation of cyclic tests at constant load amplitudes – DIN 50100:2016
  12. Wear resistance of laser cladded Stellite 31 coating on AISI 316L steel
  13. Determination of the Johnson-Cook damage parameter D4 by Charpy impact testing
  14. Effect of residual Alclad on friction stir spot welds of AA2219 alloys
  15. Effect of cooling rate on microstructure, mechanical properties and residual stress of 7075 aluminum alloy
  16. Failure analysis of an adhesively joined composite pipe system under internal pressure
  17. Non-metallic inclusions and fatigue strength of steel 34CrNiMo6
  18. Untersuchungen des Schädigungsgrades von Polyethylenformstoffen als Werkstoffe von Heizöllagerbehältern nach einer Nutzungsdauer von über 30 Jahren
  19. Microstructure and mechanical properties of AZ31 Mg alloy produced by a new compound extrusion technique
  20. Failure analysis of a cracked Q125 casing for ultra-deep wells at the Tarim Oilfield
https://doi.org/10.3139/120.111245

Artikel in diesem Heft

  1. Inhalt/Contents
  2. Contents
  3. Laudatio
  4. Professor Dr.-Ing. Harald Zenner: on the occasion of his eightieth birthday
  5. Fachbeiträge/Technical Contributions
  6. Fatigue life curve – A continuous Wöhler curve from LCF to VHCF
  7. On the accuracy of estimating fatigue notch factors
  8. Analytical strength assessments of austempered ductile iron components
  9. On the estimation of cyclic material properties – Part 1: Quality of known estimation methods
  10. On the estimation of cyclic material properties – Part 2: Introduction of a new estimation method
  11. Execution and evaluation of cyclic tests at constant load amplitudes – DIN 50100:2016
  12. Wear resistance of laser cladded Stellite 31 coating on AISI 316L steel
  13. Determination of the Johnson-Cook damage parameter D4 by Charpy impact testing
  14. Effect of residual Alclad on friction stir spot welds of AA2219 alloys
  15. Effect of cooling rate on microstructure, mechanical properties and residual stress of 7075 aluminum alloy
  16. Failure analysis of an adhesively joined composite pipe system under internal pressure
  17. Non-metallic inclusions and fatigue strength of steel 34CrNiMo6
  18. Untersuchungen des Schädigungsgrades von Polyethylenformstoffen als Werkstoffe von Heizöllagerbehältern nach einer Nutzungsdauer von über 30 Jahren
  19. Microstructure and mechanical properties of AZ31 Mg alloy produced by a new compound extrusion technique
  20. Failure analysis of a cracked Q125 casing for ultra-deep wells at the Tarim Oilfield
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