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Hot Cracking Susceptibility of Wrought 6005 and 6082 Aluminum Alloys

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Hot Cracking Phenomena in Welds III

Abstract

Hot cracks can easily be produced in the welding of aluminium 6000 series if the welding conditions and welding procedures are not carefully controlled. The aim of this study is to examine both theoretically and experimentally some of the factors that cause hot cracks and how to minimize or avoid this undesirable outcome when welding 10 mm thick heat treatable wrought aluminium alloys 6005-T6 and 6082-T6 bead-on-plate using 4043 and 5356 alloy filler metal by mechanised gas tungsten arc (GTA) and gas metal arc (GMA) welding processes. The welding process, filler metal composition and preheating temperature have been chosen as the main factors affecting the formation of hot cracking. A comparison of these welding processes will be made based on heat input (Q). The influence of different factors on sensitivity to cracking is evaluated by preparing macro and micro photos of the test samples, and Vickers hardness tests were used to examine the extent of cracks formed and the degree of the loss of hardness. It has been shown in experiments that specimens welded with 5356 alloy filler wire are more prone to hot cracking than those welded with 4043 wire, and GMAW shows less cracks than GTAW due to its lower heat input. The effect of preheating proves to have little or no consequence.

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Acknowledgements

This work was supported by the Finnish Funding Agency for Technology and Innovation (TEKES) under Grant (MODUVA). The authors are grateful to Antti Kähkönen and Antti Heikkinen for providing the test materials.

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Authors and Affiliations

  1. Laboratory of Welding Technology and Laser Processing, Lappeenranta University of Technology, Lappeenranta, Finland

    Paul Kah, Esa Hiltunen & Fisseha Brhane

  2. Department of Mechanical Engineering, Laboratory of Welding Technology and Laser Processing, Lappeenranta University of Technology, Lappeenranta, Finland

    Jukka Martikainen, Esa Hiltunen & Fisseha Brhane

  3. Department of Welding and Laser Technologies, St. Petersburg State Polytechnic University, Saint Petersburg, Russia

    Victor Karkhin

Authors
  1. Paul Kah
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  2. Jukka Martikainen
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  3. Esa Hiltunen
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  4. Fisseha Brhane
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  5. Victor Karkhin
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Correspondence to Paul Kah .

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Editors and Affiliations

  1. Materialforschung und -prüfung (BAM), Bundesanstalt für, Unter den Eichen 87, Berlin, 12205, Berlin, Germany

    Thomas Böllinghaus

  2. , Dept. of Industrial, Welding,, The Ohio State University, Arthur E. Adams Drive 1248, Columbus, 43221, Ohio, USA

    John Lippold

  3. Materialforschung und -prüfung (BAM), Bundesanstalt für, Unter den Eichen 87, Berlin, 12205, Berlin, Germany

    Carl E. Cross

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Kah, P., Martikainen, J., Hiltunen, E., Brhane, F., Karkhin, V. (2011). Hot Cracking Susceptibility of Wrought 6005 and 6082 Aluminum Alloys. In: Böllinghaus, T., Lippold, J., Cross, C. (eds) Hot Cracking Phenomena in Welds III. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-16864-2_4

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