Preparation method for sintered flux used for nickel base strip electrode submerged arc surfacing

Disclosed is a preparation method for a sintered flux used for nickel base strip electrode submerged arc surfacing. The sintered flux contains fluorite, marble, alpha-aluminum oxide, zircon sand, sodium fluoride, pure potash water glass and alloy powder. A nickel base band is an EQNiCrMo-3 welding strip. The fluorite, the marble, the alpha-aluminum oxide, the zircon sand, the sodium fluoride and the alloy powder are subjected to dry mixing together and stirred evenly. Afterwards the pure potash water glass is added for wet mixing pelletizing and wet-mixed pellets are stirred evenly. The wet-mixed pellets are put into a drying oven for low temperature drying, and the temperature of low temperature drying is controlled to be 300 DEG C. Then the wet-mixed pellets are moved into a high temperature sintering furnace for high temperature sintering, and the temperature of high temperature sintering is controlled to be 650 DEG C-700 DEG C. After high temperature sintering, the sintered flux is obtained after 20-100 mesh screening. The sintered flux has a good welding technological property and is matched with the corresponding welding strip for welding. The chemical components of a surfacing layer meet requirements. The result of an intergranular corrosion test is good. No cracks are generated when a bending test is conducted after corrosion. The use requirements are met.