A pipeline crackA fracture or discontinuity in the wall of a pipeline, where the material is separated or broken, potentially compromising the integrity and safety of the pipel… that is formed at the toe of a weldLocalized coalescence of metals produced by heating the materials to the welding temperature, with or without the application of pressure, or by the application… jointA single section (also pipe spool) of pipe that is circumferentially welded to form a pipeline.. It is typically a hairline crack located at the base or the root of the weld where it connects to the parent material of the pipe. Toe cracks can be a result of various factors, including welding defects, stressThe internal forces and pressures experienced by a pipeline as a result of various factors, including internal and external loads, operating conditions, and env… concentrations, or material properties.