The invention discloses a
welding method for a central
nozzle flange and a
nozzle corrugated
pipe body of a 300MW-level gas
turbine, and relates to a corrugated
pipe body
welding method. The
welding method aims to solve the problems that a corrugated
pipe is compressed in the existing
brazing assembly process, so that non-uniform rebound force is formed by the corrugated pipe, and a
nozzle is seriously eccentric; and in a nozzle body
laser welding structure, a base material is a thin-wall part, uneven and rapid heat input causes stress to be generated in the material, and
welding deformation is particularly serious. The welding method comprises the steps that S1, a swirler is welded; S2, a nozzle swirler
assembly welding positioning tool is installed; S3,
brazing filler metal is added; S4,positioning and pressing are carried out; S5, the coaxiality is checked; S6, welding and fixing are carried out; S7, vacuum
brazing is carried out, specifically, a gas
turbine nozzle
assembly fixed in the sixth step is fed into a vacuum heat treatment furnace to be subjected to vacuum brazing. The welding method can used for welding the corrugated pipe body.