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针对某型发动机燃烧室外套搭接滚焊缝处存在的裂纹,从冶金和有限元强度分析角度对焊缝裂纹扩展寿命、试片疲劳和全寿命疲劳试验等进行研究与验证,给出焊缝裂纹的扩展寿命,得出搭接滚焊缝处存在裂纹的燃烧室外套可安全使用的结论。
In view of the cracks existing in the lap seam welds of a certain type of engine combustor jacket, the crack propagation life, specimen fatigue and fatigue life test of the weld are studied and verified from the perspective of metallurgy and finite element analysis. The extended life of the crack leads to the conclusion that the combustion chamber jacket with cracks in the lap seam weld can be safely used.