Journal of Materials Science

, Volume 42, Issue 17, pp 7154–7161 | Cite as

Microstructural and mechanical characterization of electron beam welded Al-alloy 7020



The electron beam (EB) welding process is used to weld any metal that can be arc welded with equal or superior weld quality. EB welding is carried out in a high-purity vacuum environment, which results in freedom from impurities such as oxides and nitrides. Thus, pore-free joints can readily be achieved in metallic materials, such as Al-alloys and Ti-alloys. However, autogenous EB welding of some aluminium alloys leads to a significant strength reduction (undermatching) in the fusion zone due to the loss of strengthening phases. For such Al-alloys, the local microstructure-property relationships should be established to satisfy the service requirement of a welded component with strength undermatching. Autogenous EB welding was performed on 5 mm thick aluminium alloy 7020 plate. Microstructural characterization of the weld metals was made by optical and scanning electron microscopy. Extensive microhardness measurements were conducted in the weld regions of the joints which exhibited a hardness loss in the fusion zone due to the loss of strengthening phases. Tensile properties of the joints were determined by testing flat transverse tensile specimens at room temperature without machining the weld profiles. Furthermore, elastic-plastic fracture toughness tests (CTOD) were carried out on the base material and welded joints at room temperature.


Welding Fracture Toughness Weld Metal Fusion Zone Hardness Profile 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This work is a part of the Brite Euram ASPOW project (BRPR95-0021). Authors wish to thank the European Commission for the financial support. Thanks are also due to Mr. S. Riekehr, Mr. H. Mackel, and Mr. V. Ventzke for their assistance in conducting the experimental work. They would also like to thank Mr. G. Jennequin and Mr. P. Gonthier-Maurin of CNIM, La Seyne-Sur-Mer Cedex, France, where electron beam welding was performed.


  1. 1.
    Kuo S (1986) Welding research council bulletin, no. 320, WRC, New YorkGoogle Scholar
  2. 2.
    Çam G, Koçak M (1998) Sci Technol Welding Joining 3(4):159Google Scholar
  3. 3.
    Çam G, dos Santos JF, Koçak M (1997) Laser and electron beam weldability of Al-alloys: literature review. GKSS 97/E/25, GKSS Research Center, Geesthacht, Germany, IIW Doc. IX-1896-98 Google Scholar
  4. 4.
    Çam G, Koçak M (1998) Int Mater Rev 43(1):1Google Scholar
  5. 5.
    Olson DL et al (eds) (1993) ASM handbook: welding, brazing, and soldering, vol 6. ASM International, Materials Park, OhioGoogle Scholar
  6. 6.
    Murphy JL, Huber RA, Lever WE (1990) Weld J Res Suppl 69(4):125sGoogle Scholar
  7. 7.
    Cieslak MJ, Fuerschbach PW (1988) Metall Trans B 19B:319Google Scholar
  8. 8.
    Petrov DA (1993) In: Petzow G, Effenberg G (eds) Ternary alloys, vol. 7. VHC Publishers, New York, p 57Google Scholar
  9. 9.
    Rao SRK et al (2005) Mater Charact 55:345CrossRefGoogle Scholar
  10. 10.
    Çam G et al (1999) J Sci Technol Welding Joining 4(5):317CrossRefGoogle Scholar
  11. 11.
    Çam G et al (2000) Practical Metallography 37(2):59, also available as GKSS Report, GKSS 2000/9, GKSS Research Center, Geesthacht, Germany, 2000Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Faculty of Engineering and Architecture, Mechanical Engineering DepartmentMustafa Kemal UniversityAntakyaTurkey
  2. 2.GKSS Research CenterInstitute of Materials ResearchGeesthachtGermany

Personalised recommendations