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从断裂力学、焊缝内在质量两者分析着手，找出焊接质量的薄弱区域，在标准、规程允许范围内，还过控制检测的方法、手段、技术，用以保证局部无损探伤可靠性几率最大，并不至漏检危险性缺陷。
From the fracture mechanics, weld quality analysis of both start, to find the welding quality of the weak area, in the standard, the procedure allows the range, but also control testing methods, means and techniques to ensure the reliability of local non-destructive testing the most likely , Not to undetected dangerous defects.