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Investigation of the hardness–toughness relationship of a welded joint after different heat treatment cycles

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Abstract

Due to the increasing use of high-strength steels, the requirements for filler materials are also growing. To investigate the toughness properties of the corresponding welded joints, a new testing method has to be developed. This new test method uses subsized Charpy-V specimens (abbr. KLST samples) which permit the analysis of welded sheets with a thickness of approx. 5 mm. For the development and evaluation of the new method, a high-strength steel (S690) and a high-strength filler metal (T 69 5 ZMn2NiCrMo M M1 H5) were used. Physical simulations of various post-weld heat treatment cycles and multipass welding were conducted in a dilatometer. After the heat treatment, the toughness of the specimens was tested by Charpy impact testing and the hardness with Vickers hardness measurements. Additional metallographic investigations were also carried out. The results show that the method provides useful results for a wide range of parameters and it is appropriate for the simulation of post-weld heat treatment cycles and multipass welding on welded joints.

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Acknowledgments

Financial support of the Austrian “Österreichische Forschungsförderungsgesellschaft (FFG)” in framework of the project “Welding of High Strength Steels” is thankfully acknowledged by the authors of this article.

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Authors and Affiliations

  1. TÜV AUSTRIA SERVICES GMBH, Graz, Austria

    Thomas Schlagradl

  2. Upper Austria University of Applied Science, Wels, Austria

    Reinhold Schneider

  3. Fronius International GmbH, Wels, Austria

    Gerhard Posch

  4. Böhler Schweißtechnik Austria GmbH, Kapfenberg, Austria

    Ronald Schnitzer

Authors
  1. Thomas Schlagradl
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  2. Reinhold Schneider
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  3. Gerhard Posch
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  4. Ronald Schnitzer
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Corresponding author

Correspondence to Thomas Schlagradl.

Additional information

Doc. IIW-2270, recommended for publication by Commission II “Arc Welding and Filler Metals”.

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Schlagradl, T., Schneider, R., Posch, G. et al. Investigation of the hardness–toughness relationship of a welded joint after different heat treatment cycles. Weld World 57, 113–121 (2013). https://doi.org/10.1007/s40194-012-0012-4

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  • DOI: https://doi.org/10.1007/s40194-012-0012-4

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