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Summary
The improved performance due to the use of flux in automatic welding of a superduplex stainless steel with the A‐TIG process is presented. The flux used during welding enables molten pool depth to be increased in a single pass, with complete penetration of a plate 5.6 mm thick and without edge preparation. Welding energy is located in the range of values recommended for this type of steel. The beads obtained were observed using optical micrography and were subjected to mechanical and corrosion tests, as well as ferrite content measurement testing. In addition, the influence of flux grain measurement and the nature of welding gas on flux effectiveness were studied. These tests reveal that the use of flux not only enables superduplex stainless steels 5.6 mm thick to be welded in a single pass but it also improves mechanical properties, corrosion characteristics and austenite content of welded joints, while maintaining an austenite volume fraction identical to that of the parent metal.