Standard Digital Reference Images for Steel Fusion Welds

Importancia y uso:

4.1 These digital reference images may be used as a means for establishing the types and severity levels of discontinuities that are revealed by digital radiographic examination of steel fusion welds.

4.2 Personnel utilizing digital reference images to this standard shall be qualified to perform radiographic interpretation in accordance with a nationally or internationally recognized NDT personnel qualification practice or standard and certified by the employer or certifying agency, as applicable. The practice or standard used, and its applicable revision shall be identified in the contractual agreement between the using parties. If assistance is needed with interpreting specifications and product requirements as applied to the reference radiographs, a certified Level III shall be consulted before accept/reject decisions are made (if the Level III is the radiographic interpreter, this may be the same person).

4.3 The combined volumes contain illustrations of representative graded and ungraded discontinuities applicable to seven thickness ranges, as shown in Table 1. Table 2 lists the discontinuity types and severities illustrated for each thickness of base material. Each of the graded discontinuity types has five severity levels, 1 through 5 in order of increasing severity. The ungraded discontinuities are included for informational purposes.

(A) In the special cases of joining two members of unequal thickness, the standard applicable to the thinner member shall be used. (A) The severity of linear porosity (globular indications) should be judged by their length and clustering rather than by their optical density.

4.4 These digital reference images may be used in contractual specifications, for which agreement has been reached between purchaser and supplier, to establish acceptance limits of the types and severity levels of discontinuities revealed by digital radiographic examination.

4.5 The use of this document is not intended to be restricted to the specific energy levels given in Table 3 or to the thickness limits given in Table 1. This document may be used, where there is no other applicable document, for other energy levels or thicknesses, or both, for which it is found to be applicable and for which agreement has been reached between purchaser and manufacturer.

(A) All films were processed by automatic film processors.(B) ASTM Guide E94.(C) Not defined in Guide E94; manufacturers' description is—ultra fine grain, high contrast.(D) These reference radiographs were made with ⁶⁰Co.

Subcomité:

E07.02

Volúmen:

03.04

Palabras clave:

discontinuities; fusion welds; gamma ray; reference radiographs; steel; X-ray;