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1、INTERNATIONAL STANDARD IS0 9916 First edition 1991-02-15 Aluminium alloy and magnesium alloy castings - Liquid penetrant inspection Pi - the severity level. It should be noted that sensitivity may differ de- pending on the method of liquid penetrant inspection selected. Hence required severity level
2、s shall be selected as a function of the penetrants and the method agreed upon by the purchaser and the sup- plier. The type of discontinuity and the severity level may vary depending on the area of the casting inspected (see table 2, table 3 and table 4). Inspection shall be considered satisfactory
3、 if the discontinuities found correspond to a severity level lower than, or equal to, that agreed upon by con- tract If this is not the case, the casting shall be either re- jected or brought into conformity with the specifi- cation agreed upon by contract, by a method acceptable to the purchaser. I
4、n general, there is no limit to the extent of the ac- ceptability of discontinuities in a casting provided that, in the casting as a whole, no single area of 105 mm x 148 mm*) contains discontinuities which exceed the severity level in question. *) A6 Format. If the dimensions of a casting do not co
5、rrespond to this format, severity levels corresponding to a new format will have to be agreed upon by the purchaser and the supplier. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21
6、/2007 08:55:05 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 9916:1991 (E) 4 Method of inspection 4.1 Procedure The general principles shall be as described in IS0 3452: 1984, clause 7. The characteristics of the penetrants shall be checked in accordance with the requ
7、irements of IS0 3453. 4.2 Competence of operators Liquid penetrant inspection shall be performed by technically competent operators. Their competence shall be demonstrated by certi- fication procedures. 4.3 Surface preparation The surface to be inspected shall be clean and free from oil, grease, mou
8、lding residues or any other contaminant which could interfere with the correct interpretation of the penetrant inspection test re- sults. The surface shall be prepared taking into account the dimensions of the smallest discontinuity present. The surface finish shall be selected from table 1, unless
9、otherwise specified at the time of ordering. It is recommended that the assessment of surface finish be carried out using a visual cast-surface roughness gauge. Liquid penetrant inspection shall be performed on castings in the as-delivered condition. If sand- blasting or shot-blasting is required, i
10、t shall be as light as possible, in order to avoid sealing or closing up possible defects. If this risk cannot be accepted (e.g. in the case of lost-wax castings), blasting may be followed by chemical etching in order to make detection of de- fects easier. The bath composition and application (conce
11、ntration, temperature, immersion time, etc.) shall be defined for each case. Table 1 - Recommended surface finish for liquid penetrant inspection of aluminium alloy and magnesium alloy castings Size of smallest Indication considered R, 1 mm vm 0,3 25 1) For guidance in the selection of a visual cast
12、- surface roughness gauge. By agreement, one of the following specimens may be used: - LCA No. 3 (obtainable from: Forges du Vulcain, 26, rue du Bailly, 93200 St Denis, France, or Lefkvre Prkision, 2.1. des Richardets, 14-16, rue du Ballon, 93160 Noisy Le Grand, France, - CSC (Cast Surface Comparato
13、r) (obtainable from: The Aluminium Association, 818 Connecticut ave- nue, Washington, DC 2006, USA). 4.4 Conditions of examination The inspection shall be carried out with the naked eye or at a maximum magnification of x 3. 5 Acceptance test 5.1 Discontinuity indications The images of discontinuitie
14、s or so-called disconti- nuity indications may be non-linear (isolated or clustered), aligned or linear. Although liquid penetrant inspection cannot generally be used to determine the size of detected discontinuities, it al- lows linear discontinuities to be assessed by meas- urement of the length I
15、, of the discontinuity indication. The various types of penetrant indication can correspond to the discontinuities shown in table 2. 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/
16、2007 08:55:05 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 9916:1991 (E) Table 2 - Nature of discontinuities and types of corresponding indication Type of indication Nature of discontinuity Blowholes, pinholes Inclusions (other than alumina) Shrinkage Cracks Cold shu
17、ts, cold sets Alumina Designation Non-linear Aligned Linear isolated clustered SR AMR AR LR A X X X B X X X C X X X X D X X H X X X J X X The physical discontinuities designated A, B, C, D, H, J in table2 can give different types of penetrant indication: a) non-linear, such that 1, 3b; where 5.2 Sev
18、erity levels Different severity levels may be selected from table 3 and table 4. Table 3 corresponds to linear indications “SR” or clustered “AMR” indications. Table4 corresponds to linear indications “LR” or aligned Indications “AR”. The maximum permissible length for linear indi- cations may vary
19、depending on the casting thick- ness. The corresponding severity level shall be selected accordingly and specified in the order by agreement between the purchaser and the supplier. Table 3 and table4 are independent. The severity level for each type of indication shall be specified at the time of or
20、dering. The penetrant indications to be taken into account shall have dimensions varying according to the se- verity level. L is the length of the indication: b is the width of the indication. 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=
21、NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 08:55:05 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 9916:1991 (E) Table 3 - Severity levels for penetrant inspection - Non-linear indications (isolated “SR” or clustered “AMR”) This table specifies th
22、e maximum permissible number of indications in an area of 105 mm x 148 mm. Severity levels are designated SR Ol-AMR 01 to SR 3-AMR 3. SR 01 SR 02 SR 03 SR 1 SR 2 SR 3 Severity levels AMR 01 AMR 02 AMR 03 AMR 1 AMR 2 AMR 3 Means of observing penetrant Magnifying indications glass or Eye eye Magnifica
23、tion for observation Q 5 mm, forming a cluster with a diameter less than 16 mm. SR 2 AMR 2 . . . . . . *. . .*a. . . . . . . . . .*. . .*. . . * . . . . . . . . . * . . . .*.* -. . . . . . .* . . *: . * . . . .*.* a:. . . * -. .*.* a.*. . .*a, . . .*.* . . . . . . . .:. . .*. . . * *. . . . . . . .*
24、:. . . P 7 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 08:55:05 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 9916:1991 (E) A.1.3 Severity lev
25、el SR 3 - AMR 3 Maximum twelve non-linear indications, 2 mm D 8 mm, forming a cluster with a diameter less than 25 mm. SR 3 AMR 3 1 b 0 I I . ,.- ,:.I:.:. . . . . . . . . . . . I:.:.:.:.:. :;:.:.:.: . . . . . . . . . . :.:.:. . . :.:.:.:.:.: . . :.;:.: . . :.:;:.:.:.j :.:.:.:;:.:I .: , . . . . ,: :.
26、:I,.: . _. 8 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 08:55:05 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 9916:1991(E) A.2 Severity leve
27、ls - Aligned and linear lndlcatlons (types A, 6, C, D, H, and J) designated AR-LR A.2.q Severity level AR 1 - LR 1 I,5 mm isolated length Q 2 mm. Cumulative length Q 4 mm. AR 1 LR 1 I . c 9 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA
28、Technical Standards 1/9972545001 Not for Resale, 04/21/2007 08:55:05 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 9916:1991(E) A.2.2 Severity level AR 2 - LR 2 2 mm isolated length G 4 mm. Cumulative length 6 mm. AR 2 LR 2 c . 10 Copyright International Organization
29、for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 08:55:05 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 9916:1991(E) A.2.3 Severity level AR 3 - LR 3 2 mm isolated length Q 6 mm. Cumul
30、ative length 10 mm. AR 3 LR 3 . Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 08:55:05 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 9916:1991(E
31、) A.2.4 Severity level AR 4 - LR 4 2 mm -c isolated length 16 mm. Cumulative length 25 mm. AR 4 LR 4 L . 12 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 08:55:05 MDTNo reprodu
32、ction or networking permitted without license from IHS -,-,- IS0 9916:1991 (E) A.2.5 Severity level AR 5 - LR 5 3 mm isolated length Q 40 mm. Cumulative length 63 mm. AR 5 LR 5 c 13 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technica
33、l Standards 1/9972545001 Not for Resale, 04/21/2007 08:55:05 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 9916:1991(E) UDC 1669.715 + .721.5.018.28:620.179.111 Descriptors: light alloys, aluminium alloys, magnesium alloys, castings, tests, nondestructive tests, penetration tests. Price based on 13 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 08:55:05 MDTNo reproduction or networking permitted without license from IHS -,-,-