The Weldability of Duplex Stainless-Steel in Structural Components to Withstand Corrosive Marine Environments
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2020-11-05
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Multidisciplinary Digital Publishing Institute (MDPI)
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Abstract
There is still a considerable gap in the definition of the weldability of Duplex Stainless Steel
(DSS). A lack of clarity that is explained by the standard specification of the maximum content of
equivalent carbon that defines a “weldable” steel coupled with the fact that the alloying elements of
DSS exceed this defined limit of weldability. In this paper, welding quality in an inert environment
and in presence of chlorides is analyzed with the aim of defining optimum welding conditions of
2001, 2304, and 2205 DSS. The same procedure is followed for a hybrid weld between DSS 2205 and a
low carbon mild steel, S275JR. As main output, this study defined the optimal welding conditions
with tungsten inert gas without filler for each type of DSS weld that showed excellent anti-corrosion
performance, with the exception of the DSS 2205-S275JR weld where widespread corrosion was
observed. Additionally, this study established a relationship between the thermal input during
welding and the content of alloying elements in defect-free joints. Furthermore, it demonstrated that
an increase in ferrite content did not lead to a worse corrosion resistance, as expected after passivation.
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Stainless steels, Weldability, Aggressive environments, Marine environments, Heat input
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journal article
Citation
Calderon-Uriszar-Aldaca, Iñigo, Estibaliz Briz, Harkaitz Garcia, and Amaia Matanza. “The Weldability of Duplex Stainless-Steel in Structural Components to Withstand Corrosive Marine Environments.” Metals 10, no. 11 (November 5, 2020): 1475. doi:10.3390/met10111475.