A Study of Inspection Systems for Welded Products. Part 1: Principles of Inspection

摘要

The publication reports the general results from a study of the efficiency of inspection systems applied to large, welded products. Several aspects of inspection systems have been analyzed. Various sources of uncertainty inherent to inspection systems have been identified. Formulas for determination of OC-curves and safety factors on defect size are given for defects following a log-extreme value distribution. The uncertainties involved in conventional inspection of large, welded products appear to be very large and to necessitate a substantial safety factor on defect size. This may explain the strict acceptance criteria commonly found in standards, codes and specifications. It is evident, however, that any amelioration of the examination, either through an expansion of the examination, or through more efficient NDE procedures, allows acceptance of larger defects. (Copyright (c) The Danish Welding Institute 1978.)