A brazing method for the head assembly of a flame cylinder

Abstract

The invention discloses a flame tube head assembly brazing method and belongs to the technical field of aero-engine part manufacturing. In a brazing method of a traditional flame tube head assembly, an assembly substrate at a positioning welding point is oxidized due to the fact that a tube front section and a splash pan are positioned through argon arc welding, so that during brazing, brazing filter metal cannot moisten the substrate at the positioning welding point, the brazing seam is not continuous, and a design requirement of a continuous brazing seam cannot be achieved, and after brazing, a cold air hole is blocked by the brazing filter metal, the brazed rate between a sleeve and a swirler cannot achieve a design requirement of more than 80%. The flame tube head assembly brazing method has the advantages that the assembly substrate at the positioning welding point is avoided from being oxidized due to positioning through energy storage spot welding, enabling the paste brazing filter metal to moisten the substrate at the positioning welding point and guaranteeing the continuous brazing seam design requirement; enabling a to-be-welded position on the internal side of the sleeve to satisfy the brazed rate requirement and avoiding the brazing filter metal blocking the cold air hole during the brazing process due to the fact that check soldering flux pains inside the cold air hole; the operability is strong and production costs are obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of manufacturing aero-engine components, in particular to a brazing method for a flame tube head assembly. Background technique [0002] The head assembly of the flame tube is an important component of the aero-engine, and its working temperature is about 1000°C. The head assembly of the flame tube is composed of a vortex, the front section of the cylinder, a splash plate and a sleeve, all of which are made of superalloy materials. The front part of the cylinder, the splash plate and the sleeve are installed on the vortexer in three layers in sequence, and the front part of the cylinder, the splash plate, the sleeve and the vortexer must be connected by brazing. [0003] Traditional brazing methods for flame tube head assemblies are: [0004] ① Before brazing, argon arc welding is used to position the front section of the cylinder and the vortex according to the design size, and an appropriate amount of pas...

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Problems solved by technology

[0008] However, there are unavoidable defects in the brazing method of the above-mentioned flame cylinder head assembly: since the front section of the cylinder and the splash plate are positioned by argon arc welding, this leads to the oxidation of the component matrix at the positioning solder joint, During brazing, the brazing material cannot wet the substrate at the positioning solder joint, resulting in discontinuous brazing seam, which cannot meet the design requirements of continuous brazing seam; because the φ0.5mm cold air hole on the front section of the cylinder is close to the brazing seam, the brazing seam After welding, the cold air hole will be blocked by the solder; when the sleeve is assembled, the inside of the sleeve to be welded is covered, so it is impossible to add solder. When brazing, the inside of the sleeve to be welded can only rely on the The brazing material shared by the splash plate and biased towards the splash plate is used for welding, which directly leads to the brazing rate between the sleeve and the vortexer not meeting the design requirements of more than 80%.

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