Repair welding method for deep groove of blade casting

Abstract

The invention discloses a repair welding method for a deep groove of a blade casting, which comprises the following steps: firstly, melting a base body of a part by adopting laser welding equipment to carry out backing welding, and under the condition of not filling wires, enabling a base body material of the part to flow towards the bottom of the deep groove after being melted to form a laser welding seam so as to ensure that the bottom of the deep groove of the part is penetrated through and reduce the dilution rate of a base material; due to the fact that the laser welding energy density is high, the width of a heat affected zone is small, and heat input is small, part deformation is reduced, meanwhile, a deep and narrow deep groove in the part is changed into a shallow and wide U-shaped groove, and next-step repair welding of the part is facilitated; then high-frequency argon arc welding is adopted for conducting wire filling cover face surfacing on the U-shaped groove, the enough surfacing size is guaranteed, it is guaranteed that the part has enough machining allowance in follow-up machining after the part is repaired through repair welding, meanwhile, the high-frequency argon arc welding enables electric arc capacity to be concentrated, heat input is low, and a heat affected zone is smaller through superposition of high-frequency current and electric arc contraction; and a welding seam is narrower, deformation and cracking of parts are greatly reduced, and grain growth is inhibited.

Description

technical field [0001] The invention relates to the technical field of aero-engine casting repairs, in particular to a repair welding method for deep grooves of aero-engine gas turbine guide vane castings. Background technique [0002] Aeroengine gas turbine guide vane is an important part of the engine. Its structure is complex, especially the machining accuracy of the sealing groove is high. At the same time, the casting of the sealing groove is difficult, the process is complicated, the production cycle is long, and the processing cost is high. , Once the sealing groove is out of tolerance, due to the difficulty of repairing welding, it is easy to cause parts to be scrapped, causing serious losses, and reducing the development and production progress of the engine. This is because the sealing groove of the guide vane is generally EDM, the sealing groove is deep and narrow, and since the parts have been finished, the requirements for controlling the deformation of the weld...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a repair welding method for deep grooves of blade castings to solve the existing technical problems of large deformation and coarse grains of parts after repair welding of deep grooves of blade castings

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