In this paper,the fracture of grey cast iron weld has been observed by SEM,and the mechanisms of the cracking initation and progression have been discussed.

• 通过灰口铸铁同质电弧冷焊焊缝断口宏观与显微分析，对灰口铸铁焊缝裂纹的形成及扩展机理进行了探讨。