GB/T 17925-2011 in English

《GB/T 17925-2011气瓶对接焊缝X射线数字成像检测》由TC31（全国气瓶标准化技术委员会）归口，TC31SC2（全国气瓶标准化技术委员会焊接气瓶分会）执行，主管部门为国家标准化管理委员会。

1 Scope

This standard specifies the system composition, radiation detector, examination environment, examination method, imaging technology, image quality, image display and observation, image assessment, examination report, image storage and procedure qualification and the like for X-ray digital radioscopic examination method of cylinder weld.
This standard is applicable to the X-ray digital radioscopic examination of cylinder weld made of steel and nonferrous materials with 1.5 mm ~ 20.0 mm thick base metals.
The radiographic examination technique specified in this standard is the technology of Level AB-medium sensitivity.
This standard may be regarded as the reference to the X-ray digital radioscopic examination of the butt weld of other apparatus.

2 Normative References

The following documents are indispensable for the application of this document. For dated references, only the dated edition is applicable to this document. For undated references, the latest edition (including all the amendments) applies.
JB/T 4730.2-2005 Nondestructive Testing of Pressure Equipments - Part 2: Radiographic Testing
JB/T 7902 Non-destructive Testing-Image Quality Indicators (wire type) for Radiographic Testing
JB/T 10815 Non-destructive Testing-Image Resolution Indicators for Radioscopy Testing

3 Term and Definitions

Contents
Foreword I
Introduction II
1 Scope
2 Normative References
3 Term and Definitions
4 Symbols
5 Examination Personnel
6 X-ray Digital Radioscopic Examination System
7 Examination Environment
8 Examination Technique Requirements
9 Imaging Technology Requirements
10 Image Quality
11 Image Display and Observation
12 Image Assessment
13 Examination Report
14 Image Storage
15 Examination Procedure Qualification
16 Procedure Documents
Appendix A (Normative) Testing Procedure of Image Grey Level
Appendix B (Normative) Testing Method for Image Resolution and Unsharpness
Appendix C (Normative) Minimum Transillumination Times of the Whole Girth Weld
Appendix D (Normative) Geometrical Tester
Appendix E (Informative) Examination report
Appendix F (Normative) Examination Procedure Qualification