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GB/T 23901.3-2019 English PDF (GBT23901.3-2019)

GB/T 23901.3-2019 English PDF (GBT23901.3-2019)

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GB/T 23901.3-2019: Non-destructive testing -- Image quality of radiographs -- Part 3: Image quality classes

GB/T 23901.3-2019
Non-destructive testing--Image quality of radiographs--Part 3. Image quality classes ICS 19.100
J04
National Standards of People's Republic of China
Replace GB/T 23901.3-2009
Non-destructive testing radiographic inspection image quality
Part 3. Image quality classification
Part 3. Imagequalityclasses
(ISO 19232-3.2013, IDT)
Published on.2019-06-04
2020-01-01 implementation
State market supervision and administration
China National Standardization Administration issued
Content
Foreword III
1 range 1
2 Normative references 1
3 Terms and Definitions 1
4 image quality level 2
5 placement of the image quality 2
6 Determination of image quality 2
7 image quality value of gamma radiography detection 2
8 Single-wall transillumination technology (source side A-level image quality) 3 9 Single-wall transillumination technology (source side B-level image quality) 4 10 double wall double shadow transillumination technology (source side A level image quality) 5 11 double wall double shadow transillumination technology (source side B quality) 6 12 double wall double shadow or double wall single shadow transillumination technology (detector side A level image quality) 7 13 double wall double shadow or double wall single shadow transillumination technology (detector side B quality) 8 Foreword
GB/T 23901 "Non-destructive testing radiographic inspection image quality" is divided into five parts. ---Part 1. Determination of the image quality of the silk-type image quality meter; --- Part 2. Determination of image quality values of stepped hole image quality meters; --- Part 3. Image quality classification;
--- Part 4. Experimental evaluation of image quality and image quality table; --- Part 5. Determination of image clarity of double-filament image quality. This part is the third part of GB/T 23901.
This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 23901.3-2009 "Non-destructive testing of radiographic film quality - Part 3. s. Class, compared with GB/T 23901.3-2009, the main changes are as follows. --- Removed the restriction on "black metal" in the range, and changed "black metal image quality classification" to "image quality classification"; --- Revised the normative reference document (see Chapter 2, Chapter 2 of the.2009 edition); ---Modified terms and definitions (see Chapter 3, Chapter 3 of the.2009 edition); --- Updated the image quality value determination method when using Ir192 and Se75, and the image quality value of gamma radiography detection (see Chapter 7, Table 1~Table 4 of the.2009 edition;
--- Removed the footnotes from Table 1 to Table 12 (see Tables 1 to 12 of the.2009 edition); ---" Radiographic film quality" was changed to "radiography to detect image quality"; --- "Image quality index" was changed to "image quality value";
--- "film" changed to "detector";
--- "Linear image quality meter", changed to "silk image quality meter". This section uses the translation method equivalent to ISO 19232-3.2013 "Non-destructive testing radiographic inspection image quality Part 3. Image Quality classification.
The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows. ---GB/T 19802-2005 Minimum requirements for non-destructive testing of industrial radiographic viewing lamps (ISO 5580.1985, IDT) ---GB/T 19943-2005 Non-destructive testing of metal materials X and gamma radiography detection basic rules (ISO 5579. 1998, IDT)
--- GB/T 23901.1-2019 Non-destructive testing - Radiographic image quality - Part 1 . s Determination (ISO 19232-1.2013, IDT)
--- GB/T 23901.2-2019 Non-destructive testing - Radiographic image quality - Part 2. Stepped hole image quality image quality Determination of values (ISO 19232-2.2013, IDT)
This part is proposed and managed by the National Non-Destructive Testing Standardization Technical Committee (SAC/TC56). This section drafted by. Shanghai Space Propulsion Research Institute, Shanghai Aerospace Power Technology Engineering Co., Ltd., Shanghai Materials Research Institute, Zhejiang Province Jinyun Image Quality Factory, Hubei Sanjiang Aerospace Jiangbei Machinery Engineering Co., Ltd., Matrix Science and Technology Testing Technology (Beijing) Co., Ltd., China Guangdong Nuclear Power Engineering Co., Ltd. Co., Ltd., Shanghai Aerospace Equipment Manufacturing Co., Ltd., Sichuan Aerospace Chuanan Fire Technology Co., Ltd., Shanghai Aerospace Precision Machinery Research Institute, Shanghai Satellite Equipment Research Institute, Shanghai Feitian Zhongzhi Technology Co., Ltd., Zhejiang Special Equipment Inspection and Research Institute, Aerospace Materials and Process Research Research Institute, CITIC Daika Co., Ltd., Institute of Acoustics, Chinese Academy of Sciences, Donghai Research Station, Ningbo Special Equipment Inspection and Research Institute, Shanghai Airlines Tiantian Control Technology Research Institute, Aintik Testing Technology (Shanghai) Co., Ltd. The main drafters of this section. Chen Yiwei, Xu Guozhen, Jiang Jiansheng, Ding Jie, Liu Zhanglong, Wang Xiaoyong, Jiang Yunxi, Zhu Congbin, Xu Wei, Zhang Zheng, Zhou Jianping, Wei Wei, Sun Jianwei, Wang Daolong, Huang Wenda, Lu Yanda, Yuan Life, Liu Jun, Hu Ling, Chen Hu, Yuan Zhizuo, Zhang Rui, Zhang Yifeng, Yan Lianna, Ma Jun.
The previous versions of the standards replaced by this section are.
---GB/T 23901.3-2009.
Non-destructive testing radiographic inspection image quality
Part 3. Image quality classification
1 Scope
This part of GB/T 23901 specifies the image quality values to be achieved during radiographic inspection to ensure the same radiographic inspection image. Quality Evaluation.
This section applies to the wire-type image quality meter specified in ISO 19232-1 and the order specified in ISO 19232-2 for radiographic inspection. The ladder-type image quality meter evaluates the image quality.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. ISO 5579 Non-destructive testing of metal materials X or gamma radiographic inspection basic rules (Non-destructive testing-Ra- DiographicexaminationofmetalicmaterialsbyX-andgammarays-Basicrules)
ISO 5580 Non-destructive testing industrial radiography viewing lamp minimum requirements (Non-destructive testing-Industrialradi- ographiciluminators-Minimumrequirements)
ISO 17636 (all parts) Non-destructive testing of welds (Non-destructive testing ofwelds- Radiographictesting)
Non-destructive testing - Radiographic image quality - Part 1 . Determination of image quality values of silk-type image quality (Non-de- structivetesting-Imagequalityofradiographs-Part 1.Determinationoftheimagequalityvalueu- Singwire-typeimagequalityindicators)
Non-destructive testing - Radiographic image quality - Part 2. Determination of image quality values of stepped hole image quality (Non-destructivetesting-Imagequalityofradiographs-Part 2.Determinationoftheimagequality Valueusingstep/hole-typeimagequalityindicators)
3 Terms and definitions
The following terms and definitions defined by ISO 5579 apply to this document. 3.1
Image quality image qualityindicator; IQI
The ability to measure the quality of the image, consisting of a series of different grades of wire or a stepped hole. Note. The image quality indicator can also be expressed by image quality indicator and IQI. The image quality type is usually a wire type or a stepped hole type. 3.2
Image quality value
Expressed as a requirement to determine or achieve the most fine or smallest pore identifiable on the radiographic image of the image quality. Note. Image quality values can also be expressed in terms of image quality values and IQI sensitivity (IQIsensitivity). The image quality values are shown in Table 1 to Table 12. 3.3
Image quality table
A summary of the image quality values required to correspond to the transillumination thickness. 4 image quality level
4.1 Single wall transillumination
Meet the ISO 5579 testing requirements, can reach the image quality level of Table 1 ~ Table 4. a) for Class A radiographic inspection techniques, corresponding to Class A image quality (see ISO 5579); b) For Class B radiographic inspection techniques, corresponding to Class B image quality (see ISO 5579). The image quality values given in Tables 1 to 4 are used when the image quality meter is placed in the source. If the image quality meter cannot be placed in the source, it can be placed in the probe. On the side of the device, Tables 1 to 4 cannot be used in this case.
Note. For special transillumination (for example, using Ir192 to transilluminate thin-walled workpieces), different image quality values can be selected as specified, see Chapter 7. 4.2 Double wall transillumination
The ISO 5579 inspection requirements are met to achieve the image quality levels in Tables 5 through 12. a) for Class A radiographic inspection techniques, corresponding to Class A image quality (see ISO 5579); b) For Class B radiographic inspection techniques, corresponding to Class B image quality (see ISO 5579). Note. For special transillumination (for example, using Ir192 to illuminate thin-plate workpieces), different image quality values can be selected as specified, see Chapter 7. When a double-wall transillumination line photography technique is employed, the transillumination thickness w is the sum of the nominal thickness t of the workpiece through which the radiation penetrates. The image quality values shown in Tables 5 to 8 apply to the A-level and B-level image quality levels of the double-walled double-shadow transillumination method when the image quality meter is placed on the source side. The image quality values shown in Tables 9 to 12 are applicable to the A-level and B-level image quality of the double-wall single-shadow transillumination method when the image quality meter is placed on the detector side. Level, also applicable to the A-level and B-level image quality levels of the double-walled double-shadow transillumination method when the quality meter is placed on the detector side, as in ISO 17636. Line elliptical transillumination detection.
5 placement of the image quality meter
For radiographic inspection, the image quality meter should be placed on the source side surface of the workpiece to be inspected. When the source side surface of the workpiece to be inspected cannot be placed in the image quality meter When the image quality meter can be placed on the detector side of the workpiece to be inspected, the word "F" should be placed near the image meter to distinguish it. The image quality meter should be placed in the work A relatively uniform thickness of the area. If there are special requirements, it should be carried out according to the standards adopted. 6 Determination of image quality
With film radiographic inspection, when determining the image quality, the viewing conditions should meet the requirements of ISO 5580. For a silk-type image quality meter, the number of the finest filaments that can be recognized on the image is the image quality value. When the image density (or grayscale) is uniform When a continuous wire image having a length of not less than 10 mm is clearly recognized, the image of the wire is considered to be identifiable. For a stepped hole type image quality meter, the number of the smallest hole that can be recognized on the film is the image quality value. When there are two holes on the same ladder, Both holes should be identifiable on the image.
In general, each radiographic test should verify that the quality of the test meets the requirements by determining the image quality value. Similar in transillumination When the workpiece and area are inspected, if the same exposure and processing techniques are used to ensure that the resulting image quality values are not different, then no need is required. To verify the quality of each image, the scope of verification of image quality is agreed upon by the parties to the contract. 7 Image quality values detected by gamma radiography
When using Ir192 or Se75 for radiographic inspection, if the parties agree to the following regulations, the obtained image quality value may be lower than Table 1~ Table 12 specifies.
Double wall double shadow transillumination method (Table 5~ Table 8), transillumination thickness (w), image quality level including A grade and B grade. ---Use Ir192, 10mm \u003cw≤25mm,允许像质值减少1;
---Use Se75, 5mm \u003cw≤12mm,允许像质值减少1。
Single wall single shadow transillumination method and double wall single shadow transillumination method (Table 1, Table 2, Table 9 and Table 10), transillumination thickness (w), image quality level is Class A.
---Use Ir192, 10mm \u003cw≤24mm,允许像质值减少2;
---Use Ir192, 24mm \u003cw≤30mm,允许像质值减少1;
---Use Se75, 5mm \u003cw≤24mm,允许像质值减少1。
Single wall single shadow transillumination method and double wall single shadow transillumination method (Table 3, Table 4, Table 11 and Table 12), transillumination thickness (w), image quality level is Level B.
---Use Ir192, 10mm \u003cw≤40mm,允许像质值减少1;
---Use Se75, 5mm \u003cw≤20mm,允许像质值减少1。
8 single-wall transillumination technology (source side A-level image quality) The A-level image quality values that should be achieved when the image quality meter is placed on the source side are shown in Tables 1 to 2. Table 1 Silk quality image quality
Class A image quality
Nominal thickness t/mm image quality value
T≤1.2 W18
1.2 \u003ct≤2 W17
2 \u003ct≤3.5 W16
3.5 \u003ct≤5 W15
5 \u003ct≤7 W14
7 \u003ct≤10 W13
10 \u003ct≤15 W12
15 \u003ct≤25 W11
25 \u003ct≤32 W10
32 \u003ct≤40 W9
40 \u003ct≤55 W8
55 \u003ct≤85 W7
85 \u003ct≤150 W6
150 \u003ct≤250 W5
t>250 W4
Table 2 Stepped hole image quality image quality
Class A image quality
Nominal thickness t/mm image quality value
T≤2 H3
2 \u003ct≤3.5 H4
3.5 \u003ct≤6 H5
6 \u003ct≤10 H6
10 \u003ct≤15 H7
15 \u003ct≤24 H8
twenty four \u003ct≤30 H9
30 \u003ct≤40 H10
40 \u003ct≤60 H11
60 \u003ct≤100 H12
100 \u003ct≤150 H13
150 \u003ct≤200 H14
200 \u003ct≤250 H15
250 \u003ct≤320 H16
320 \u003ct≤400 H17
t>400 H18
9 single-wall transillumination technology (source side B-level image quality) The B-level image quality values that should be achieved when the image quality meter is placed on the source side are shown in Tables 3 to 4. Table 3 Silk quality image quality
Class B image quality
Nominal thickness t/mm image quality value
T≤1.5 W19
1.5 \u003ct≤2.5 W18
2.5 \u003ct≤4 W17
4 \u003ct≤6 W16
6 \u003ct≤8 W15
8 \u003ct≤12 W14
12 \u003ct≤20 W13
20 \u003ct≤30 W12
30 \u003ct≤35 W11
Table 3 (continued)
Class B image quality
Nominal thickness t/mm image quality value
35 \u003ct≤45 W10
45 \u003ct≤65 W9
65 \u003ct≤120 W8
120 \u003ct≤200 W7
200 \u003ct≤350 W6
t>350 W5
Table 4 Stepped hole image quality image quality
Class B image quality
Nominal thickness t/mm image quality value
T≤2.5 H2
2.5 \u003ct≤4 H3
4 \u003ct≤8 H4
8 \u003ct≤12 H5
12 \u003ct≤20 H6
20 \u003ct≤30 H7
30 \u003ct≤40 H8
40 \u003ct≤60 H9
60 \u003ct≤80 H10
80 \u003ct≤100 H11
100 \u003ct≤150 H12
150 \u003ct≤200 H13
200 \u003ct≤250 H14
10 double wall double shadow transillumination technology (source side A level image quality) The A-level image quality values that should be achieved when the image quality meter is placed on the source side are shown in Table 5 to Table 6. Table 5 Silk quality image quality
Class A image quality
Transillumination thickness w/mm image quality value
W≤1.2 W18
1.2 \u003cw≤2 W17
Table 5 (continued)
Class A image quality
Transillumination thickness w/mm image quality value
2 \u003cw≤3.5 W16
3.5 \u003cw≤5 W15
5 \u003cw≤7 W14
7 \u003cw≤12 W13
12 \u003cw≤18 W12
18 \u003cw≤30 W11
30 \u003cw≤40 W10
40 \u003cw≤50 W9
50 \u003cw≤60 W8
60 \u003cw≤85 W7
85 \u003cw≤120 W6
120 \u003cw≤220 W5
220 \u003cw≤380 W4
w>380 W3
Table 6 Stepped hole image quality image quality
Class A image quality
Transillumination thickness w/mm image quality value
W≤1 H3
1 \u003cw≤2 H4
2 \u003cw≤3.5 H5
3.5 \u003cw≤5.5 H6
5.5 \u003cw≤10 H7
10 \u003cw≤19 H8
19 \u003cw≤35 H9
11 double wall double shadow transillumination technology (source side B level image quality) The B-level image quality values that should be achieved when the image quality meter is placed on the source side are shown in Table 7 to Table 8. Table 7 Silk quality image quality
Class B image quality
Transillumination thickness w/mm image quality value
W≤1.5 W19
1.5 \u003cw≤2.5 W18
2.5 \u003cw≤4 W17
4 \u003cw≤6 W16
6 \u003cw≤8 W15
8 \u003cw≤15 W14
15 \u003cw≤25 W13
25 \u003cw≤38 W12
38 \u003cw≤45 W11
45 \u003cw≤55 W10
55 \u003cw≤70 W9
70 \u003cw≤100 W8
100 \u003cw≤170 W7
170 \u003cw≤250 W6
w>250 W5
Table 8 Stepped hole image quality image quality
Class B image quality
Transillumination thickness w/mm image quality value
W≤1 H2
1 \u003cw≤2.5 H3
2.5 \u003cw≤4 H4
4 \u003cw≤6 H5
6 \u003cw≤11 H6
11 \u003cw≤20 H7
20 \u003cw≤35 H8
12 double wall double shadow or double wall single shadow transillumination technology (detector side A level image quality) The image quality meter is placed on the detector side, and the A-level image quality values to be achieved are shown in Table 9 to Table 10. Table 9 Silk quality image quality
Class A image quality
Transillumination thickness w/mm image quality value
W≤1.2 W18
1.2 \u003cw≤2 W17
2 \u003cw≤3.5 W16
3.5 \u003cw≤5 W15
5 \u003cw≤10 W14
10 \u003cw≤15 W13
15 \u003cw≤22 W12
twenty two \u003cw≤38 W11
38 \u003cw≤48 W10
48 \u003cw≤60 W9
60 \u003cw≤85 W8
85 \u003cw≤125 W7
125 \u003cw≤225 W6
225 \u003cw≤375 W5
w>375 W4
Table 10 Stepped hole image quality image quality
Class A image quality
Transillumination thickness w/mm image quality value
W≤2 H3
2 \u003cw≤5 H4
5 \u003cw≤9 H5
9 \u003cw≤14 H6
14 \u003cw≤22 H7
twenty two \u003cw≤36 H8
36 \u003cw≤50 H9
50 \u003cw≤80 H10
13 double wall double shadow or double wall single shadow transillumination technology (detector side B level image quality) The image quality values of the B-class that should be achieved on the detector side are shown in Table 11 to Table 12. Table 11 Silk quality image quality
Class B image quality
Transillumination thickness w/mm image quality value
W≤1.5 W19
1.5 \u003cw≤2.5 W18
2.5 \u003cw≤4 W17
4 \u003cw≤6 W16
6 \u003cw≤12 W15
12 \u003cw≤18 W14
18 \u003cw≤30 W13
30 \u003cw≤45 W12
45 \u003cw≤55 W11
55 \u003cw≤70 W10
70 \u003cw≤100 W9
100 \u003cw≤180 W8
180 \u003cw≤300 W7
w>300 W6
Table 12 Stepped hole image quality image quality
Class B image quality
Transillumination thickness w/mm image quality value
W≤2.5 H2
2.5 \u003cw≤5.5 H3
...

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