Effect of Oxide Fluxes on Activated TIG Welding of P91 Steel
The current work investigates effect of different oxide fluxes (TiO2, Cr2O3, CuO, and MoO3)on single pass autogenous tungsten inert gas welding of P91 steel. Weld bead geometries obtained with and without use of fluxes were studied. All the oxide fluxes resulted in improvement in depth of penetration and reduction in bead width. The role of oxygen content was analyzed and it was found that 30-80 ppm oxygen content is favorable for improving depth of penetration. Additionally, metallographic studies were done with the help of scanning electron microscopy.
Keywords - P91 steel, A-TIG welding, Oxide fluxes, Dissolved oxygen, Microstructure