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基于损伤理论，将用于评价体积型缺陷的API RP 579公式进行了改进，建立了点腐蚀损伤管道的剩余强度评价公式。
Based on damage theory, residual strength assessment formula has been developed by modifying API RP 579 formula for volumetric flaw evaluation.
经过对32个实际焊接缺陷超声回波信号的分类识别，平面型缺陷的正确分类率为86%，体积型缺陷的正确分类率为78%；
The investigation of 32 natural weld defects show that 86% of the plane defects and 78% of the volume defects can be correctly classified.
而线缺陷型包裹体体积变化较大；
The inclusions trapped in line defect usually have different volumes.
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