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Effect of welding process on the microstructure and properties of dissimilar weld joints between low alloy steel and duplex stainless steel

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Abstract

To obtain high-quality dissimilar weld joints, the processes of metal inert gas (MIG) welding and tungsten inert gas (TIG) welding for duplex stainless steel (DSS) and low alloy steel were compared in this paper. The microstructure and corrosion morphology of dissimilar weld joints were observed by scanning electron microscopy (SEM); the chemical compositions in different zones were detected by energy-dispersive spectroscopy (EDS); the mechanical properties were measured by microhardness test, tensile test, and impact test; the corrosion behavior was evaluated by polarization curves. Obvious concentration gradients of Ni and Cr exist between the fusion boundary and the type II boundary, where the hardness is much higher. The impact toughness of weld metal by MIG welding is higher than that by TIG welding. The corrosion current density of TIG weld metal is higher than that of MIG weld metal in a 3.5wt% NaCl solution. Galvanic corrosion happens between low alloy steel and weld metal, revealing the weakness of low alloy steel in industrial service. The quality of joints produced by MIG welding is better than that by TIG welding in mechanical performance and corrosion resistance. MIG welding with the filler metal ER2009 is the suitable welding process for dissimilar metals jointing between UNS S31803 duplex stainless steel and low alloy steel in practical application.

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Authors and Affiliations

  1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Jing Wang, Min-xu Lu, Lei Zhang & Li-ning Xu

  2. Research Institute of China National Offshore Oil Corporation, Beijing, 100027, China

    Wei Chang & Li-hua Hu

Authors
  1. Jing Wang
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  2. Min-xu Lu
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  3. Lei Zhang
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  4. Wei Chang
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  5. Li-ning Xu
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  6. Li-hua Hu
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Corresponding author

Correspondence to Min-xu Lu.

Additional information

This work was financially supported by the National Science and Technology Major Project of China (Grant No.2011ZX05056).

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Wang, J., Lu, Mx., Zhang, L. et al. Effect of welding process on the microstructure and properties of dissimilar weld joints between low alloy steel and duplex stainless steel. Int J Miner Metall Mater 19, 518–524 (2012). https://doi.org/10.1007/s12613-012-0589-z

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  • DOI: https://doi.org/10.1007/s12613-012-0589-z

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