FIELD: metallurgy.
SUBSTANCE: invention relates to welding by fusion of superalloys and can be used for manufacturing and repairing gas turbine engine elements. Base material made of superalloy is coated with a composite filler powder, containing 5–50 wt% brazing powder, which includes melting point depressants, and 50–95 wt% high temperature welding powder. Method includes simultaneous heating base material and composite filler powder to a temperature that will fully melt brazing powder and and at least partially melt high temperature welding powder, and also melt a surface layer to form a weld pool. Weld pool is cooled at rate providing, during crystallisation and cooling, formation of a composite structure, comprising interconnected grid of dendrites with high melting point, obtained from high-temperature welding powder, and formation from high-melting point solder powder, high-temperature welding powder and base material in weld bead of dendritic eutectic matrix. Splicing of weld bead and base material is obtained. Method includes performing post-welding thermal treatment at temperature above temperature of solidus of brazing powder and below temperature of solidus of high-temperature welding powder.
EFFECT: technical result is enabling self-healing of cracks during welding and post-welding heat treatment.
10 cl, 8 dwg, 3 tbl, 9 ex
