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DD CEN/TS 14751:2004
Superseded
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Welding. Use of time-of-flight diffraction technique (TOFD) for examination of welds
Hardcopy , PDF
30-09-2011
English
24-11-2004
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 General remarks on the capabilities of the technique
5 Examination levels
6 Information required prior to testing
6.1 Items to be defined by specification
6.2 Specific information required by the operator
before testing
6.3 Written test instruction
7 Requirements for personnel and equipment
7.1 Personnel qualifications
7.2 Equipment
7.2.1 Ultrasonic equipment and display
7.2.2 Ultrasonic probes
7.2.3 Scanning mechanisms
8 Preparation for testing
8.1 Volume to be inspected
8.2 Set up of probes
8.3 Scan increment setting
8.4 Geometry considerations
8.5 Preparation of scanning surfaces
8.6 Temperature
8.7 Couplant
8.8 Provision of datum points
9 Testing of base material
10 Range and sensitivity settings
10.1 Settings
10.1.1 General
10.1.2 Time window
10.1.3 Time-to-depth conversion
10.1.4 Sensitivity settings
10.2 Checking of the settings
10.3 Reference blocks
10.3.1 General
10.3.2 Material
10.3.3 Dimensions and shape
10.3.4 Reference reflectors
11 Weld testing
12 Interpretation and analysis of TOFD images
12.1 General
12.2 Assessing the quality of the TOFD image
12.3 Identification of relevant indications
12.4 Classification of relevant indications
12.4.1 General
12.4.2 Indications from surface breaking
discontinuities
12.4.3 Indications from embedded discontinuities
12.4.4 Unclassified indications
12.5 Determination of location and size
12.5.1 Location
12.5.2 Sizing
12.6 Evaluation against acceptance criteria
13 Test report
13.1 General
13.2 Information relating to object under test
13.3 Information relating to equipment
13.4 Information relating to test technique
13.5 Information relating to test results
Annex A (informative) Reference blocks
A.1 Thickness requirements
A.1.1 Maximum thickness
A.1.2 Minimum thickness
A.2 Reference reflectors
A.3 Typical reference blocks
Annex B (informative) Examples of typical scans
B.1 Satisfactory and unsatisfactory TOFD-images
B.2 Typical TOFD-images of discontinuities in fusion
welded joints
B.3 TOFD-images of geometrical features
Bibliography
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