The effects of the type of electrode coating – basic or rutile – on the microstructure, and strength and impact properties of a welded structure constructed from duplex stainless steel UNS–S31803 were investigated. It was found that the use of a rutile coated electrode leads to considerable porosity and a higher nitrogen content but lower oxygen, and hence less ε-Fe2O3 is created compared with weldments produced using an electrode having a basic coating. These phenomena, in turn, cause a higher volume fraction of austenite and thus a higher low temperature impact energy, as well as improved ductility; however, the yield strength is reduced compared with that following basic coated electrode welding.
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