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A laser repair welding method for casting defects of tial castings

A technology of casting defects and laser repair welding, which is applied in the field of laser repair welding of casting defects of TiAl castings and repairing of casting defects of TiAl castings, can solve the problems of high temperature endangering the safety of welders, high requirements for preheating tooling, and large residual stress, etc. Achieve the effect of fast heating speed, small deformation and small residual stress

Active Publication Date: 2017-01-04
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

When argon arc welding is used for direct repair welding, due to the large heat input of argon arc welding, the fusion ratio of filler solder and matrix is ​​large, the residual stress caused after welding is large, and welding cracks will inevitably appear in the repair welding position. For repair welding, TiAl castings must be preheated before welding, kept warm during welding, and the preheating temperature is above 800°C, and it needs to be cooled slowly after welding (cooling with the furnace). High temperature during welding endangers welder safety

Method used

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  • A laser repair welding method for casting defects of tial castings

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specific example 1

[0031] Repair welding of TiAl test piece by laser cladding

[0032] Defect preparation of TiAl test piece

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Abstract

The invention belongs to the technical field of laser processing, and relates to a laser repair welding method for casting defects of TiAl castings, which is mainly used for repairing casting defects of TiAl castings. The invention selects Ti2AlNb metal powder with better ductility than the substrate as the cladding material, adopts reasonable laser cladding process parameters, and repairs TiAl casting defects (cracks, inclusions, shrinkage porosity, and undercasting). The repaired part has almost no deformation, no cracks, pores, and unfused defects, forming a high-quality repaired welded joint.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and relates to a laser repair welding method for casting defects of TiAl castings, which is mainly used for repairing casting defects of TiAl castings. Background technique [0002] In order to improve the thrust-to-weight ratio of aero-engines, it is necessary to focus on breakthroughs in key technologies such as structural design, materials, and molding processes of engine components. Reducing the weight of the engine is one of the important ways to increase the thrust-to-weight ratio of the engine. Therefore, lightweight and high-temperature-resistant materials have become excellent materials for advanced aero-engines. Among them, Ti-Al-based alloys have great potential in the application of high-temperature structural materials. It is the material of choice for partial replacement of superalloys. TiAl-based alloy, as a kind of Ti-Al-based alloy, has entered the stage of mature appli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10
Inventor 孙兵兵陈波陈冰清张学军郭绍庆李能
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS