Laser composite repair method for surface corrosion of inner hole of shell

Abstract

The invention relates to a laser composite repair method for surface corrosion of an inner hole of a shell. The laser composite repair method comprises the following steps of disassembling and cleaning the surface of an inner hole of a powder push rod shell, and measuring the dimensions; determining the local corrosion part and corrosion amount of the inner hole; analyzing the powder push rod shell and evaluating the life of the powder push rod shell according to the detection results, and removing the corrosion layer of the inner hole of the shell; and adopting magnetic particle testing, andensuring that no crack defects occur after removal of the corrosion layer. By adopting preset additive materials of microarc deposition GH4169 corrosion resistant metal bars, the trouble that powder is hard to reach the repair part of the inner hole in a laser cladding feeding mode is overcome; by adopting a microarc deposition and laser scanning composite processing mod, a specific method for corrosion repair of the inner hole is formed; beneficial reference is provided for damage repair of the inner hole, and the repair method has the advantages of low heat input amount and thermal deformation amount, and less heat effect on and heat damage to metal base; and the repair quality of the inner hole of the shell can be improved obviously.

Description

technical field [0001] The invention relates to the technical field of laser cladding, in particular to a laser composite repair method for surface corrosion of inner holes of shells. Background technique [0002] The material of the aircraft propellant push rod shell parts is 30CrMnSiA. Due to the influence of the propellant storage environment during its long-term service, local corrosion failures in the inner hole with a diameter of 50mm have occurred, and appropriate methods need to be used to repair it. With the existing micro-arc deposition method, there are many micropores in the repair layer, and the surface roughness and air tightness test of the repaired inner hole are difficult to meet the requirements. Due to the limited inner hole diameter of the part, it is difficult to accurately clad the powder by using the laser cladding repair method. Delivered to repair site. "Thermal Processing Technology", Volume 41, Issue 20, Pages 111-114, published in 2012, discloses...

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Problems solved by technology

With the existing micro-arc deposition method, there are many micropores in the repair layer, and the surface roughness and air tightness test of the repaired inner hole are difficult to meet the requirements. Due to the limited inner hole diameter of the part, it is difficult to accurately clad the powder by using the laser cladding repair method. Delivery to the repair site

"Thermal Processing Technology", Volume 41, Issue 20, Pages 111-114, published in 2012, discloses the research on laser cladding-micro-arc spark deposition composite repair technology, the purpose of which is to use the micro-arc spark deposition process to obtain A layer of intermediate transition layer, and then use laser cladding on the intermediate coating to prepare the coating with the required properties of the substrate. The disadvantage is that it is difficult to implement laser cladding powder feeding for inner hole repair, and there is no clear solution to inner hole corrosion. The specific method of repair

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