USED FOR:
(Parts 1–2) Non destructive testing (NDT) of welds — Radiographic testing
Film-based (Part 1) and digital (Part 2) radiographic examination of welded joints.
RELATED STANDARDS:
- ISO 19232-1 “Non-destructive testing – Image quality of radiographs – Part 1: Determination of the image quality value using wire-type image quality indicators”
- ISO 19232-2 “Non-destructive testing – Image quality of radiographs – Part 2: Determination of the image quality value using step/hole-type image quality indicators”
- ISO 9712 “Non-destructive testing – Qualification and certification of NDT personnel”
- ISO 10675-1 “Non-destructive testing of welds – Acceptance levels for radiographic testing – Part 1: Steel, nickel, titanium and their alloys”
- ISO 17635 “Non-destructive testing of welds – General rules for metallic materials”
DIMENSIONAL RANGE:
The dimensional variable that actually drives ISO 17636 is penetrated material thickness, not pipe DN or NPS: the standard’s tables map penetrated thickness bands to the minimum wire (or step/hole) that must be visible on the radiograph for a given technique class, at a given thickness the required IQI sensitivity for Class B is always tighter than for Class A. There’s no absolute thickness ceiling declared in the standard itself, but the tables carry specific caveats at the lower end, for instance a restriction on using Se-75 sources for penetrated thicknesses under about 12 mm unless the contracting parties agree otherwise. We always treat “penetrated thickness plus technique class” as the real sizing input here, rather than expecting a DN or wall-thickness range the way we would for a component standard.
DESCRIPTION:
Defines technique Class A (basic) versus Class B (improved, higher sensitivity), image-quality-indicator selection, source-to-film distance, and exposure geometry. Choosing Class A when the contract quality level actually demands the resolution of Class B is one of the more common, and expensive, mistakes we’ve seen at incoming inspection stage.
IMPORTANT NOTES:
ISO 17636 governs the technique; it does not certify the operator (that’s ISO 9712) and does not set the pass/fail criteria (that’s ISO 10675).
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