Abstract: A flux for wire electrode submerged arc welding of stainless steel containing Nb or Ti has been developed. Slag sticking has been avoided by controlling the total amount of SiO₂ within the scope of 7.55%~8.15%. The agglomerated flux adopted CaF₂-Al₂O₃ slag system. When the flux is matched with welding wires of ER347 and ER321, the arc is staoble, the detachability good and appearance after welding good. The agglomerated flux has metallurgy capability. The chemical composition, mechanical properties and intergranular corrosion resistance of the deposited metal are good.