Repair method and repair device for concave and convex defects in laser light internal powder feeding cladding

Abstract

The invention discloses a repairing method and device for a concave-convex defect of inside-laser powder feeding cladding. The repairing method comprises the following steps of S1, controlling a concave point in a concave-convex defect surface of a base material to be located on an initial negative defocusing position of an annularly-tapered focused laser beam; S2, controlling the annularly-tapered focused laser beam, a powder beam located inside the laser beam and a protective gas located at the periphery of the powder beam to coaxially emit; S3, controlling the laser beam, the powder beam located inside the laser beam and the protective gas located at the periphery of the powder beam to move along the concave-convex defect surface; and S4, melting the powder beam on the surface of the material by using the laser beam, solidifying to form a cladding runner, and repeatedly moving to repair the concave-convex defect step by step in a layer-by-layer cladding way. The repairing method disclosed by the invention is used for repairing the concave-convex defect surface of the base material based on hollow laser and inside-laser powder feeding; and meanwhile, an even cladding layer is formed on the concave-convex defect surface through reasonably controlling the defocusing amount of laser, so that the unevenness caused by accumulation on a forming surface in a cladding accumulation forming process is repaired.

Description

technical field [0001] The invention relates to the technical field of laser cladding three-dimensional forming, in particular to a method and a corresponding device for repairing concave-convex defects in the laser cladding process. Background technique [0002] Laser cladding three-dimensional forming technology is to irradiate the laser beam on the processing surface to form a molten pool on the surface of the metal material, and simultaneously send the powder beam into the molten pool. The laser melts the powder and moves on the processed surface, and the molten pool is continuously solidified to form a molten channel. This technology can realize moldless, fast, full-dense near-net shape of high-performance metal parts, and has developed rapidly in aerospace, metallurgy, mining, machinery manufacturing and other industries. [0003] In the process of cladding accumulation forming, process control is a very important aspect. Often during the first few layers of material ...

AI Technical Summary

Problems solved by technology

At this time, if it cannot be controlled, the surface will be uneven after several layers are piled up, which will seriously affect the forming quality, and even make the accumulation and forming process unable to continue.

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