THE INFLUENCE OF STRENGTH MISMATCHING ON THE FRACTURE PROPERTIES OF HETEROGENEOUS JOINTS
Abstract
The differences in mechanical properties among different weld regions affect the strain distribution around the crack tip during fracture toughness tests and consequently influence the fracture toughness values. This paper demonstrates that both strength and toughness affect the fracture behaviour of such complex weldments. High toughness of weld metal is necessary to enable local plastic deformation and to prevent brittle fractures. It is of the utmost importance not to exclude the possibility of plane faults and the appearance local brittle zones in steel welded joints, which can cause failure in heat affected zones and also in weld metal.
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References
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