According to API 1104, several radiographic indications observed during radiographic testing (RT) of a pipeline weld would warrant rejection. Cracks, regardless of their size or orientation, are unacceptable and cause for rejection because they represent a significant loss of structural integrity and can propagate under stress. Lack of fusion, which occurs when the weld metal does not properly fuse with the base metal, is also cause for rejection. This indication appears as a dark line on the radiograph and indicates a weak ....
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