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Effect of Shielding and Backing Gases on Mechanical and Corrosion Properties of Alloy N08935 Welds

The newly developed super-austenitic alloy, N08935, combines the best features of a high performance austenitic stainless steel and Ni-based alloys. The alloy has a nickel content of 35 wt.%, which is relatively higher than the usual austenitic steels but lower than conventional Ni-base alloys. With a high resistance to localized and uniform corrosion, it is a good alternative when standard highly alloyed austenitic 6Mo or super-duplex stainless steels do not suffice, and a cost-efficient alternative is desired to Ni-base alloys such as Alloy 625. Due to an excellent corrosion resistance and high mechanical strength, the potential use of alloy N08935 extends to chemical, petrochemical, Oil & Gas equipment, and acidic environments. However, the true test of the suitability of a material is if the weldments also measure up to the performance standards of the base material. The present study examines this concern. In this work, the GTAW (TIG) method will be used to weld 2 mm thick sheets autogenously and with Ni-based filler metal ERNiCrMo-13. The tests were performed for a combination of different shielding and backing gases with and without additions of nitrogen. The welds were evaluated according to SS-EN ISO 15614-1:2017 and additionally the corrosion properties were evaluated using the ASTM G48 standard method E. The aim of this paper is to compare the different combinations of shielding and backing gases to present proper welding recommendations for alloy N08935.
Product Number: 51324-20854-SG
Author: Deepjyoti Mukherjee; Conrad Liebsch; Thomas Hündgen; Björn Helmersson; Ravi Vishnu
Publication Date: 2024
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