The invention relates to sintered flux for
nickel strip
electrode electro-
slag welding. The sintered flux for the
nickel strip
electrode electro-
slag welding is characterized in that the intered flux is prepared from
dry powder components and binder water glass; the
dry powder components comprise, by
mass, 45-75% of CaF2, 15-35% of Al2O3, 1-5% of SiO2, 1-5% of CaO, 1-5% of MgO, 1-10% of
sodium fluoroaluminate, 1-5% of
rare earth fluoride and 1-5% of
ferroniobium alloy powder; the ratio of
potassium to
sodium of the binder water glass is 1 to 1, the
molar ratio is 2.2-3.5, the baume degree at
room temperature is 38-50, and the dosage is 15-25% of the weight of the
dry powder. The sintered flux can be used through being matched with various
nickel base
welding strip such as EQNiCrMo-3 and EQNiCr-3, when strip
electrode electro-
slag surfacing is conducted through matching with the
nickel base welding strip, stable electro-slag process and welding technological property can be maintained at the quick welding condition of 250 mm / min, the quality of formation of surfacing
layers is good, defects do not exist in
lap joint, and various indexes of the surfacing
layers can meet usage requirements of users.