A laser cladding repair method for the surface of aircraft vertical pins and bolts

Abstract

The invention discloses a laser cladding repairing method for airplane normal pin and bolt part surfaces. The method comprises the steps that spherical superhigh-strength steel metal powder is selected for faults such as mechanical and corrosive wear to the part surfaces, reasonable laser cladding technology parameters are adopted, appropriate heat treatment is adopted for removing residual stress and hydrogen atoms in the cladded parts, and therefore the performance of the airplane normal pin and bolt parts is recovered, and life extension repair is achieved. The deformation probability of the repaired normal pin and bolt parts is almost zero, and the depth of a heat affected zone is controlled within 0.5 mm; the repaired portion has no crack or melting or slag inclusion or other defects; and the using performance of normal pins and bolts is recovered. The airplane normal pin and bolt parts repaired through the method pass authentication before installation, and are installed and used successfully.

Description

technical field [0001] The invention relates to a laser cladding repair method for the surface of aircraft vertical pins and bolts, which belongs to the technical field of laser cladding. Wear faults are repaired. Background technique [0002] Aircraft vertical pins and bolts are respectively made of 18Cr2Ni4WA and 40CrNiMoA quenched and tempered high-strength steel through precision forging. After the aircraft has gone through two or more overhaul cycles, due to long-term flight use, different degrees of mechanical or corrosion wear have occurred on the working surfaces (ie surfaces) of the vertical pin rods and bolts and screws, resulting in dimensional out-of-tolerance on the surface of the parts Phenomenon. The wear depth of the working face is usually 0.1-1.0mm. Due to the high requirements for the strength, wear resistance and corrosion resistance of the repaired area of ​​the vertical pin rod and bolt screw, the above defects need to be repaired by fusion welding. ...

AI Technical Summary

Problems solved by technology

Obviously, the heat input (≥0.5KJ / mm) of conventional fusion welding repair methods (such as manual arc welding, argon arc welding, etc.) is relatively large, which is likely to cause large deformation of vertical pins and bolts during the repair process. The depth of the heat-affected zone after repair is also relatively large, which often cannot meet the requirements of the factory or maintenance guidelines

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