INTERNATIONAL STANDARD
Non-destructivetestingofwelds- Radiographictesting-
X-andgamma-raytechniqueswith Part 1: film
Essais non destructifs des assemblages soudes - Controle parradiographie -
Partie 1: Techniques par rayons X ou gamma a laide de film
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Contents
Page
6.1 Protection against ionizing radiation. 46.3 6.2 Location of the weld in the radiograph. Surface preparation and stage of manufacture.6.4 Identification of radiographs. 5 56.6 6.5 Overlap of films. Marking 5 56.7 Types and positions of image quality indicators (IQIs). 56.8 6.9 Minimum image quality values. Evaluation of image quality. 6 66.10 Personnel qualification. 7
7.1 7
Test arrangements.7.1.1 7.1.2 Single-wall penetration of plane objects (see Figure 1) General. 8 77.1.3 Single-wall penetration of curved objects with the source outside the7.1.4 object (see Figures 2 to 4) Single-wall penetration of curved objects with the source inside the object 8for panoramic exposure (see Figures 5 to Z) Single-wall penetration of curved objects with the source located off- 67.1.5 centre and inside the object (see Figures 8 to 10) 107.1.6 Double-wall penetration and double-image evaluation (DWDl) of pipes with the elliptic technique and the source and the film outside the objectDouble-wall penetration and double-image evaluation (DWDl) with the (see Figure 11) 117.1.7 perpendicular technique and source and film outside the object (see7.1.8 Figure 12) Double-wall penetration and single-image evaluation (DWSl) of curved 11objects for evaluation of the wall next to the film (see Figures 13 to 16) Penetration of objects with different material thicknesses (see Figure 17 117.1.9 to 19) 137.2 7.2.1 Choice oftubevoltage andradiationsource. X-ray devices up to 1 000 kV. 13 137.2.2 Film systems and metal screens. Other radiation sources. 147.3 7.4 Alignment of beam. 15 177.5 7.5.1 Reduction of scattered radiation. Metal filters and collimators. 17 177.5.2 Source-to-object distance. Interception of backscattered radiation. 177.6 7.7 Maximum area for a single exposure. 20 187.8 7.9 Processing. Optical density of radiograph. 21 207.10 Film viewing conditions. 21
8 Test report. 21
Annex A (normative) Number of exposures for acceptable testing of a circumferential butt weld 23Annex B (normative) Minimum image quality values. 28Annex C (informative) Calculation of maximum X-ray tube voltages from Figure 20 35Bibliography. 36
Foreword
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This document was prepared by Technical Committee ISO/TC 44 Welding and allied processes Standardization (CEN) Technical Committee CEN/TC 121 Welding and allied processes in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 17636-1:2013) which has been technicallyrevised.
The main changes are as follows:
-the normative references have been updated; the Figures have been updated;- references to Figures 1 to 19 have been updated throughout the document; in 6.Z the use of ASTM wires and other image quality indicators (IQls) by agreement of contractingparties has been added;-in 6.7 a) the acceptance of a shorter wire visibility than 10 mm for pipes with an externalanbupa (m) ae-qnop mem-aqnop aoy aesn iau oy uogege e g pue gg Zg u diameter < 50 mm has been added;has been added; in 6.9 and Z.2.2 the lower thickness limit for Se 75 applications has been deleted;measurement of optical density in the root of the weld has been clarified; IQI use for the DWDI technique has been clarified. A list of all parts in the ISO 17636 series can be found on the ISO website.
