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Dissimilar welding of the creep resistant steels CB2 and P92 with flux cored wires

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Abstract

The new boron-alloyed 9Cr-1.5Mo-1Co cast steel designated as CB2 is used for intermediate pressure turbine inner casings with steam temperature up to 620 °C. To connect the casing with a pipe made of P92 steel, dissimilar welding is necessary. As flux cored arc welding (FCAW) is a highly productive welding process, the applicability of flux cored wires is evaluated. Therefore, three test welds in vertical-up position were produced with different welding procedures: the first with P92 tungsten inert gas (TIG) welding for root and second pass and P92 FCAW for intermediate and final passes; the second with P92 TIG welding for root and second pass and CB2 FCAW for intermediate and final passes; and the third with CB2 flux cored wire for all layers as no CB2 TIG rod is available yet. Cross-weld tensile tests and impact tests on weld metal and heat-affected zones were carried out after post weld heat treatment (PWHT) of 2 × 730 °C for 12 h. The differences in mechanical and technological properties are discussed, as well as the hardness profiles in the cross sections. Thermokinetic calculations with the software package MatCalc estimate the long-term microstructural evolution of precipitates depending on the chemical composition of the weld metal.

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Acknowledgments

The authors want to thank the Austrian “Forschungsförderungsgesellschaft” (FFG) for the financial support based on the contract no. 831995.

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Authors and Affiliations

  1. voestalpine Böhler Welding Austria GmbH, Böhler-Welding-Straße 1, 8605, Kapfenberg, Austria

    S. Baumgartner, A. Holy & R. Schnitzer

  2. Institute for Materials Science and Welding, Graz University of Technology, Kopernikusgasse 24, 8010, Graz, Austria

    M. Schuler & N. Enzinger

Authors
  1. S. Baumgartner
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  2. M. Schuler
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  3. A. Holy
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  4. R. Schnitzer
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  5. N. Enzinger
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Corresponding author

Correspondence to S. Baumgartner.

Additional information

Doc. IIW-2553, recommended for publication by Commission IX “Behaviour of Metals Subjected to Welding”

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Baumgartner, S., Schuler, M., Holy, A. et al. Dissimilar welding of the creep resistant steels CB2 and P92 with flux cored wires. Weld World 59, 655–665 (2015). https://doi.org/10.1007/s40194-015-0241-4

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  • DOI: https://doi.org/10.1007/s40194-015-0241-4

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