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通过断口观察、金相检查及应力和断裂力学的分析，提出了某钛合金球形贮罐发生沿赤道焊缝热影响区爆裂事故的主要原因．
Through the fracture observation, the metallographic examination and the analysis of stress and fracture mechanics, the main reason for the burst accident occurred in the heat affected zone of a certain titanium alloy spherical tank along the equatorial weld was proposed.