Furnace brazing method for nickel-based superalloy material

The invention discloses a furnace brazing method for a nickel-based superalloy material, and belongs to the technical field of aero-engines. The furnace brazing method of the nickel-based superalloy material comprises the following steps: S1, preparation before welding: inserting a nozzle into a fuel oil main pipe ring, for a position, where the assembly gap between the nozzle and the fuel oil main pipe ring is 0.1-0.2 mm, in an area to be welded, cutting a GH600 solder sheet into long strip-shaped fragments and filling the fragments in the gap, and painting nickel powders in the assembly gap,and for a position, wherein the assembly gap between the nozzle and the fuel oil main pipe ring is 0.03-0.05 mm, in the area to be welded, directly painting nickel powders and arranging a solder ringin the area to be welded, and spot welding and positioning the solder ring at the nozzle to form an assembly to be welded; S2, soldering: placing the assembly to be welded into a vacuum brazing furnace to be brazed; and S3, w