Studies on metallurgical and corrosion characteristics of dissimilar GTAW welding of alloy 800 and SS316L using multicomponent activated flux

Abstract

Abstract Gas tungsten arc welding have been carried out using two multicomponent fluxes. Fluxes used in welding were made out of various compositions of metal oxides with different weight percentages. Flux assisted gas tungsten arc welding were performed on dissimilar metals like stainless steel 316L and Alloy 800. Large improvement in depth of penetration was observed with applied multicomponent flux. Nevertheless, metal oxides like ZnO and MoO3 could provide even better weld properties compared to some other multicomponent fluxes. Depth of penetration along with weld shape were analyzed for two multicomponent fluxes. Microstructure, grain growth, and intermixing of metals were analyzed at different locations of welds. Hardness alteration at weld locations and neighborhood were investigated. Effect of multicomponent flux at welded regions on corrosive behavior were analyzed using electrochemical corrosion tests. Multicomponent flux comprised of oxides like ZnO and MoO3 with other metal oxides appeared as better flux in terms of metallurgical accomplishments.