Characterization Electrochemical Duplex Steel UNS S31803 Welded By TIG Autogenous

Abstract

The duplex steels are widely used in the area of oil exploration, both in structure and equipment. These steels provide excellent mechanical properties combined with excellent corrosion resistance. The welding of this material takes into account the loss of alloying elements, which are directly linked to the excellent properties of this material, this loss being compensated by the addition of metal during welding. In an autogenous weld, this addition of material to balance the loss is eliminated, and under these conditions, a study subjecting the duplex UNS S31803 steel to this process, a relationship between the microstructure of the weld region and an electrochemical characterization, will be shown that this loss does not interfere with the quality of the weld and the resistance of the material to corrosion.