CECS: 7094 Radiographic Inspection Standard for Metal Fusion Welding in Building Installation Engineering CECS70:94 CECS:7094 Standard download decompression password: www.bzxz.net

CECS:70: 94
CECS 71 : 94
Standard of China Association for Standardization of Engineering Construction
Standard of Radiography for Metal Melting Weld Seamoving Installation Engineering
STANDARD OF INSPECTION AND MEASUREMENT OF RAYPHOTOGRAPHING FOR METAL MELTING WELD SEAMOFBUILDING INSTALLATION ENGINEERING CODE OF VISUAL INSPECTION AND ACCEPTANCE FOR SITE WELD OF ENGINEERING CONSTRUCTIONChina Planning Press
Standard of China Association for Standardization of Engineering Construction
Standard of Radiography for Metal Melting Weld Seamoving Installation Engineering CECS 70 : 94
Welding on construction site
Visual inspection specification
CECS 71:94
Editor: Structural Welding Committee of China Association for Engineering Construction Standardization
Approval unit: China Association for Engineering Construction Standardization Approval date: December 26, 1994
China Planning Press
1995 Beijing
China Association for Engineering Construction Standardization Standard
Metal fusion welding of building installation engineering
Radiographic inspection standard
CECS70:94
Welding on construction site
Visual inspection specification
CECS71:94
China Association for Engineering Construction Standardization
Editor-in-chief of Structural Welding Committee
(Address: 4th Floor, Building C, Guohong Building, No. 11, Mugundi Beilijia, Xicheng District, Beijing ) (Postal code: 100038 Tel: 6390641363906414) Issued by Beijing Branch of Xinhua Bookstore
Printed by World Knowledge Printing Factory
850×1168 mm 1/323.25 sheet
80,000 words
First edition in January 1996, second printing in November 2001, print run 10101-16100 copies
Unified book number: 1580058·321
Price: 7.00 yuan
The two standards "Standard for Radiographic Inspection of Metal Fusion Welds in Building Installation Engineering" and "Specifications for Visual Inspection of Welding at Construction Sites in Engineering Construction" edited by the Structural Welding Committee of the China Association for Engineering Construction Standardization have been reviewed and approved by relevant experts after extensive consultation with relevant units. The "Radiographic Inspection Standard for Metal Fusion Welding Seams in Building Installation Engineering" (CECS70:94) and "Visual Inspection Specification for Welding at Construction Sites" (CECS71:94) are now approved as the standards of the China Association for Engineering Construction Standardization. In the process of implementing these two standards, it is hoped that all units will carefully summarize their experience and pay attention to accumulating data. If any modification or supplement is found, please send your opinions to the Structural Welding Committee of the China Association for Engineering Construction Standardization (Address: Management Cadre College of the Ministry of Chemical Industry, Shijiazhuang City, Hebei Province, Postal Code: 050031). China Association for Standardization of Engineering Construction
December 26, 1994
Total Contents
Standard for Radiographic Inspection of Metal Fusion Welds in Building Installation Engineering:
Standard for Visual Inspection of Welds at Construction Sites of Engineering Construction CECS71:94(75)
CECS 70:94
Standard of China Association for Standardization of Engineering Construction
Standard for Radiographic Inspection of Metal Fusion Welds in Building Installation Engineering
STANDARD OF INSPECTION AND MEASUREMENT OF RAYBUILDING INSTALLATION ENGINEERING China Engineering Construction Standardization Association Standard
Metal Fusion Welding Seams in Building Installation Engineering
Radiographic Inspection Standard
CECS70:94
Editor: China Engineering Construction Standardization Association Structural Welding Committee
Approval Unit: China Engineering Construction Standardization Association Approval Date: December 26, 1994
2 General provisions
Conditions of radiographic testing units
Conditions of radiographic testing staff
Working procedures for radiographic testing
2.4 Number of welds to be tested by radiography
Location of welds to be tested by local radiography
Conditions to be met for welds to be tested by radiography Radiographic process
3, 14
Choice of radiation source energy
Radiographic quality grade
Classification and selection of films·
Intensifying screens
Image quality indicators (radiographs)
Symbols and codes used in marking
Exposure curvebzxZ.net
Transillumination method
Geometric conditions
Position and number of image quality indicators··
Placement of positioning marks and identification marks
Darkroom cassettes and their placement
Shielding of useless rays and scattered rays·
Photographic operation
Darkroom processing of films and film observation and weld quality grading 4.1
Darkroom processing of films
Quality of film
(8)||tt| |4.3 Film observation
4.4 Photographic film weld quality assessment
4.5 Steel fusion weld quality classification
4.6 Steel pipe fusion weld butt joint weld quality classification (30)
Test report, handling of unqualified and controversial films, spot check of test work..…(36)
5.1 Test report
5.2 Handling of unqualified films
5.3 Handling of controversial films
5.4 Spot check of radiographic test work
Construction site radiography Phase protection
Appendix A
Appendix B
Fusion welding butt joint penetration thickness
Calculation of effective focus size
Appendix C
Quality classification of aluminum fusion welding
Appendix D
Appendix E
Quality classification of titanium fusion welding
Treatment methods for expanding the assessment area
Additional instructions
Appendix: Explanation of clauses
1.0.1 This standard applies to radiographic inspection of metal fusion welding seams in building installation engineering and maintenance engineering.
1.0.2 When implementing this standard, the provisions of relevant national standards and professional standards shall also be observed.
1.0.3 When confirming the use of this standard in technical documents or contracts, all provisions of this standard shall be implemented. If only part of the provisions of this standard are adopted in radiographic inspection work, it cannot be regarded as the implementation of this standard.
General Provisions
2.1 Conditions for Radiographic Inspection Units
2.1.1 Inspection units shall meet all of the following conditions to be qualified to engage in radiographic inspection of construction and installation projects.
2.1.2 Have X-ray or other radiation sources that can be used at the construction site and fully meet the maximum penetration thickness requirements of the inspected workpieces, film processing darkroom facilities, and film observation facilities.
2.1.3 Have photographers and film assessors engaged in radiographic inspection, of which at least two photographers and one film assessor should obtain the corresponding work qualifications.
2.1.4 Units engaged in radiographic inspection that falsify records and reports shall not engage in radiographic inspection at the construction site before conducting an inspection and formulating improvement measures.
2.2 Conditions for radiographic inspection personnel
2.2.1 Personnel engaged in radiographic inspection shall undergo systematic training before work and must master the relevant technical knowledge of the radiographic inspection work they are engaged in and the basic knowledge of metal melting welding in construction and installation projects. 2.2.2 Radiographic inspection personnel must hold a work qualification certificate corresponding to their work and issued by a national authorized department. Foreign-related projects should obtain the radiographic inspection qualification certification stipulated in the contract.
2.2.3 The vision of film reviewers should be checked once a year, and the corrected vision should not be less than 1.0. It is required that a group of printed letters with a height of 0.5mm and a spacing of 0.5mm can be read at a distance of 400mm.
2.2.4 Radiographic inspection personnel must comply with the provisions of this standard. If any fault is found, 8
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