Titanium alloy compressor blade welding repair method

Abstract

The invention relates to a titanium alloy compressor blade welding repair method, which comprises the following steps of 1) machining before welding; 2) conducting blade inspection; 3) clamping a blade; (4) planning a welding process: determining the number of welding beads for welding repair according to the missing size of a blade profile, planning a welding repair track according to the outlinesize and the shape of the to-be-welded repair surface of the blade, and requiring the welding track to move along the center line of the welding repair surface, wherein all welding parameters are inlinear transition, so that the welding quality and the forming precision of a transition section are improved; 5) removing welding thermal stress by adopting heat treatment; 6) machining by a weldingmachine; 7) conducting welding defect detection. According to the titanium alloy compressor blade welding repair method provided by the invention, a visual system is adopted for planning the welding track; micro-beam pulse plasma arcs are adopted as heat source input, and welding wires are filled in cooperation with a pulse wire feeding mode, so that heat input in the welding process is reduced; and a flexible clamping tool is adopted to achieve conformal clamping of the blade, so that the cooling strength of a welding repair part is improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for repairing titanium alloy compressor blades by welding. Background technique [0002] The compressor blade is a key component of an aero-engine. Its main function is to compress the air flowing through it, increase the pressure of the air entering the combustion chamber, and create conditions for the gas expansion of the combustion chamber to do work. Compressor blades are often damaged by foreign objects, friction and wear, airflow erosion and other reasons, resulting in the loss of blade profile, which is one of the parts with the highest failure rate in the engine. After surfacing and repairing the damaged blades, the aerodynamic shape of the blades can be restored by processing methods, which can reduce the cost of using the engine in its entire life. [0003] The working environment of aero-engine compressor blades is harsh, and the requirements for the forming...

AI Technical Summary

Problems solved by technology

[0003] The working environment of aero-engine compressor blades is harsh, and the requirements for the forming accuracy and welding quality of the repaired blades are very strict; the titanium alloy used to manufacture the blades has a low thermal conductivity, and it is easy to produce overheated structures due to the long residence time at high temperature during the welding process, and the welding pool is easily damaged. Oxygen, nitrogen, hydrogen absorption, resulting in deterioration of welded joint performance

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