A micro-beam plasma welding repair method for titanium alloy air intake casing support plate cracks

Abstract

The invention belongs to the technical field of aero-engines, and relates to a microbeam plasma welding repairing method for titanium alloy inlet casing support plate cracks. The repairing method comprises the steps that firstly, the range of the cracks is determined according to a color check method; secondly, the cracks are removed through a slotting method; thirdly, an oxidization layer near the cracks is removed; fourthly, the slotted portion is coated with a titanium alloy active agent, microbeam plasma welding parameters are set, and microbeam plasma welding is carried out; fifthly, the welding quality is detected, if the quality is qualified, the seventh step is executed, and if not, the sixth step is executed; sixthly, the microbeam plasma repair welding is carried out, and the fifth step is executed; seventhly, the welding position is polished and repaired; eighthly, the welding quality is detected after polishing and repairing, if the quality is qualified, the ninth step is executed, and if not, the first step is executed; and ninthly, the local shaping thermal treatment is carried out, and repairing of the inlet casing support plate cracks is finished. The quality of an inlet casing repaired through the method meets the requiring requirement of an overhaul machine, meanwhile, using is flexible, and the welding quality is good.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, and in particular relates to a micro-beam plasma welding repair method for a titanium alloy air intake casing support plate crack. This method can be directly applied to the technical field of repair welding repair of crack defects in titanium alloy air intake casing support plate, and can also be extended to the field of repair welding repair of local defects of titanium alloy parts to solve the problem of repairing local cracks and other defects of titanium alloy parts. Background technique [0002] The welded machined components of the intake casing are one of the important parts of the aero turbofan engine, and its structure is complex. At present, the support plate of the titanium alloy air intake case is a multi-layer titanium plate superplastic forming / diffusion connection structure, and cracks on the outer plate often occur during use, and such faulty parts cannot be installed and us...

AI Technical Summary

Problems solved by technology

[0003] The existing method of using argon arc welding to repair the crack failure of the support plate of the titanium alloy intake casing, due to the low power density and shallow penetration of argon arc welding, the surface metal cannot be completely fused with the inner metal, and the formed weld cannot be well Fill the defect

There is also a method of using laser welding to repair cracks on the support plate of the titanium alloy air intake casing. Due to the uncertain location of the crack on the support plate, there is interference between the laser head and the part structure, which lacks flexibility. More importantly, due to the high-energy beam laser welding. The shape of the weld seam is poor, and the heat treatment is not timely, and cracks are easily generated