T.O. 33B-1-13-92Figure 3-42. Sharp, Well Defined Indication of Surface Discontinuity in a WeldFigure 3-43. Broad Indication of Subsurface Discontinuity in a Weld3.7.3.3 EvaluatingTheIndicationFinally, after the indication has been formed and has been interpreted, it must be evaluated. Evaluation is thedetermination of the consequences of the presence of the discontinuity. This includes determining if the discontinuityis a defect and if so, can the part be reworked or repaired, or must the part be scrapped.3.7.3.3.1Generally, an inspector has fairly detailed guidance concerning the interpretation and evaluation of indicationsincluded with the procedure by which the inspection was done. In the event such guidance is not available, thefollowing basic considerations may be used in conjunction with the inspector's knowledge and experience to help in theevaluation of indications.a. A discontinuity of any kind lying at the surface is more likely to be harmful than a discontinuity of thesame size and shape which lies below the surface.b. Any discontinuity having a principal dimension or a principal plane which lies at right angles or at aconsiderable angle to the direction of principal stress, whether the discontinuity is surface or sub-surface, is more likely to be harmful than a discontinuity of the same size, location, and shape lyingparallel to the stress.
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