Laser cladding repair method for lip crack of piston rod of aircraft 300M steel landing gear

Abstract

The invention relates to a laser cladding repair method for a lip crack of a piston rod of an aircraft 300M steel landing gear. The method comprises the following steps of 1, determining laser repairprocess parameters by simulating stretching, impact and fatigue performance experiments of the piston rod, and meanwhile determining that the groove type of laser cladding repair is V-shaped; 2, selecting a simulation part before repairing, carrying out a simulation part fatigue experiment, evaluating an experiment result, and determining a final laser cladding repair process; 3, carrying out laser repair on the crack of the piston rod; 4, detecting a repair area of the piston rod to find no crack and non-fusion defect after the repair is completed; and 5, processing the repair area, recovering the size, and meeting the drawing or assembly requirements. According to the laser cladding repair method, the fatigue experiment is carried out on the simulation part of the piston rod to determinethe final repair process, it is guaranteed that the piston rod do not crack in the long period of use, so that the safety use requirements of an aircraft in the service life period can be ensured.

Description

technical field [0001] The invention relates to the field of piston rod repair, in particular to a laser cladding repair method for cracks on the piston rod lip of an aircraft 300M steel landing gear. Background technique [0002] Fatigue cracks are prone to occur in structural parts such as the outer cylinder of the aircraft landing gear, piston rod, body parts, joints and shafts. The traditional argon arc welding has a large thermal impact, is easy to deform, has a large residual stress, and has low repair reliability, which cannot meet the repair requirements. With the prolongation of the service life of the aircraft, the landing gear parts are subjected to long-term impact loads and are in a corrosive environment, and the probability of fatigue damage is increasing. In particular, the value of the landing gear piston rod is extremely high, and the scrapping of a single piece will lead to the scrapping of the entire landing gear device. The economic loss is huge. Carry o...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of poor mechanical properties and low reliability of traditional argon arc welding repair, a landing gear is proposed by utilizing the characteristics of laser cladding technology, such as high dimensional accuracy, small heat-affected zone, very small workpiece deformation, uniform structure, and stable mechanical properties. Laser Cladding Repair Technology for Piston Rod Cracks

[0004] For example, the application number CN201710785371.9 is an electromagnetic stirring laser cladding repair method for ultra-high-strength steel landing gear components, including the following steps: (1) preparing laser cladding repair materials, (2) cleaning the surface before repairing, (3) electromagnetic stirring assistance Laser cladding repair, (4) mechanical processing, (5) non-destructive testing, (6) stress relief annealing to complete the repair, the patent did not conduct a simulation performance test on the landing gear before the repair, so the reliability of the process cannot be guaranteed

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