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某航空发动机出现了焊接裂纹故障,在进行修理的过程中使用荧光渗透探伤并没有检验出来。在分析裂纹的性质后发现该裂纹主要是由残余应力造成的延时裂纹,进行荧光探伤后没有发现开口。采用金相分析裂纹性质后,证明裂纹主要是因为残余应力造成的。综合分析后研究决定使用X射线进一步进行探伤检测,并对修理工艺流程进行优化,消除残余应力的影响,有效解决了裂纹故障。
Aeroengine suffered a weld crack failure. Fluorescent penetrant testing was not performed during the repair process. After analyzing the nature of the crack, it was found that the crack was mainly caused by the delayed stress caused by residual stress, and no opening was found after the fluorescence flaw detection. Metallographic analysis of crack properties proves that cracks are mainly caused by residual stress. Comprehensive analysis of the study decided to use X-ray detection and further testing, and repair process optimization, eliminating the impact of residual stress, crack effectively solve the problem.