Study of cold crack initiation and propagation of compacted graphite iron weld

The specimens cf welded joint of compacted graphite cast iron with homogeneous electrode were polished and then stressed under diffrent load on a tensile testing machine. Then the specimens were taken down to examine the crack initiation and propagation of the compacted graphite iron weld. Results showed that cracks were liable to be initiated in the narrow metal bridge between close graphites as well as from the tip of graphite. Further propagation cf crack developed along a path connecting the highest number of graphites.