![]() The cracks form at the solidification boundaries and are characteristically interdendritic. On breaking open the weld, the crack surface in steel and nickel alloys may have a blue oxidised appearance, showing that they were formed while the weld metal was still hot. as the cracks are often 'open', they can be visible to the naked eye.solidification cracks in the final crater may have a branching appearance.they normally appear as straight lines along the centreline of the weld bead, as shown in Fig.1, but may occasionally appear as transverse cracking depending on the solidification structure.Solidification cracks are normally readily distinguished from other types of cracks due to the following characteristic factors: Click here to see our latest technical engineering podcasts on YouTube. Cracks not only reduce the strength of the weld through the reduction in the cross section thickness but also can readily propagate through stress concentration at the tip, especially under impact loading or during service at low temperature. It is the most serious type of imperfection found in a weld and should be removed. National Structural Integrity Research CentreĪ crack may be defined as a local discontinuity produced by a fracture which can arise from the stresses generated on cooling or acting on the structure.Structural Integrity Research Foundation.
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