This standard specifies the conventional non-destructive testing method for forged and welded parts of centrifuges and separators. This standard applies to ultrasonic, radiographic, magnetic particle and color testing of forged and welded parts of centrifuge and separator drums, shafts and similar parts. JB/T 9095-1999 Conventional non-destructive testing technology for forged and welded parts of centrifuges and separators JB/T9095-1999 Standard download decompression password: www.bzxz.net

JB/T9095-1999
This standard is a revision of ZBJ77002-88 "Technical Specifications for Conventional Nondestructive Testing of Forged and Welded Parts of Centrifuges and Separators". During the revision, only editorial changes were made to the original standard, and the main technical content remained unchanged. This standard replaces ZBJ77002-88 from the date of implementation. Appendix A and Appendix B of this standard are both appendices to the standard. This standard is proposed and managed by the National Technical Committee for Separation Machinery Standardization. The responsible drafting units of this standard are Guangzhou Heavy Machinery Factory and Chongqing Jiangbei Machinery Factory. The main drafter of this standard is Zhao Hongliang.
Standard of the Machinery Industry of the People's Republic of China
Conventional nondestructive testing methods for forging and—Technical speciflcation
weldment of centrifuge and separator-1 Scope
JB/T90951999
Replaces ZBJ77002-88
This standard specifies the conventional nondestructive testing methods for forging and—Technical speciflcation
weldment of centrifuge and separator-1 Scope
JB/T90951999
Replaces ZBJ77002-88
This standard specifies the conventional nondestructive testing methods for forging and—Technical speciflcation
weldment of centrifuge and separator-1 Scope
JB/T90951999
Replaces ZBJ77002-88
This standard specifies the conventional nondestructive testing methods for forging and—Technical speciflcation
Weld ... GB/T3323--1987 Radiography and quality grading of steel fusion welded butt joints JB4730-1994 Nondestructive testing of pressure vessels
JB/T10061--1999 General technical requirements for type A pulse reflection ultrasonic flaw detector JB/T10062--1999 Performance test method for probes for ultrasonic flaw detection 3 Ultrasonic longitudinal wave flaw detection of forgings such as drum body, drum cover, piston, locking nut and similar forgings When the purchaser requires shear wave flaw detection for forgings, the supply and demand parties shall negotiate. 3.1 Workpiece
a) The surface roughness Ra value of the workpiece detection surface shall not exceed 6.3μm; b) The workpiece detection surface and its opposite surface shall be parallel to each other. If it is really difficult to achieve, the allowable deflection angle shall not exceed 3°; c) The detection surface shall not have various debris that hinders the flaw detection: d) The grain size of the material shall not affect the judgment of the flaw detection result; when the workpiece being detected affects the flaw detection due to coarse grains, the workpiece shall be re-heat treated to refine the grains.
3.2 Instrument
The flaw detector shall comply with JB/T10061 and shall meet the following requirements: a) At the maximum detection sound range of the workpiece, the combined sensitivity margin of the instrument and the probe shall not be less than 10dB(A) b) The frequency range is 1~5MHz.
3.3 Probe
a) The performance of the probe shall comply with the provisions of JB/T10062; b) When the thickness of the workpiece to be inspected is greater than or equal to 20mm, a longitudinal wave straight probe with a frequency of 2.5MHz and a chip diameter between 10 and 20mm shall be used;
c) When the thickness of the workpiece to be inspected is 10 to 19mm, a probe of special specifications shall be selected, or the dual crystal probe method shall be used for flaw detection. It is recommended to use a high-frequency large-diameter probe.
Approved by the State Bureau of Machinery Industry on July 12, 1999 244
Implemented on January 1, 2000
3.4 ​​Workpiece Acceptance Requirements
3.4.1 Standard Test Blocks
JB/T 9095--1999
When the thickness of the workpiece to be inspected is greater than or equal to 20mm, the CS-2 standard test block shall be used, see Appendix A (Appendix to the Standard), and shall comply with the provisions of 7.6.1 of JB 4730-1994. When the thickness of the workpiece to be inspected is less than 20mm, a .5mm horizontal through hole test block shall be used. 3.4.2 The flaw detection sensitivity shall be such that the reflected wave of a defect with an equivalent diameter of 1mm on the bottom surface of the forging to be inspected reaches 80% of the screen height. The difference in decibels (r) when the initial sensitivity of the flaw detection is converted from $2mm equivalent to rainbow mm equivalent is calculated by formula (1): [dB(A)] = 40log
The flat bottom aperture of the standard test block used to adjust the initial sensitivity: Wuzhong: Zhong
. The initial sensitivity aperture actually required during flaw detection. 3.4.3 The defect equivalent existing inside the workpiece is determined by comparison method or calculation method. 3.4.4 Acceptance requirements for drum body, drum cover, piston and similar parts (1
The acceptance of drum body, drum cover, piston and similar parts is divided into three zones according to the different positions along the radial direction of the workpiece cross section (see Figure 1 and Figure 2). Defects with an equivalent diameter of 1mm in each zone are not counted, but no single defect with an equivalent diameter greater than 4mm is allowed. Figure 1 Drum body (or piston)
Figure 2 Drum cover
Figure 3 Locking nut
Zone I (referring to the drum circular simplified part, or the part of the cone part close to the large end that occupies 1/3 of the part height): the inner There are scattered defects with an equivalent diameter of less than 3mm, but the distance between two adjacent defects in any direction should be greater than 40mm, and the number of defects on the same circumference should not exceed 4, and the distance between two adjacent defects on the same busbar should be greater than 100mm, and the number of defects should not exceed 3; in an area of ​​100cm2, the number of defects should not exceed 5. The total number of defects allowed in the drum in this area is determined by dividing its maximum diameter (mm) by 35. Zone II (refers to the bottom of the drum or the cone part of the drum cover, that is, between Zone I and Part between Zone III): It is allowed that there are scattered defects with an equivalent diameter of less than 3mm inside the workpiece, but the distance between two adjacent defects should be greater than 40mm, and the number of defects should not exceed 5 in an area of ​​100cm2. Zone III (referring to the drum hub or the smallest end of the cone): It is allowed that there are scattered defects with an equivalent diameter of less than 4mm inside the workpiece, but the distance between two adjacent defects should be greater than 20mm. 3.4.5 Acceptance requirements for locking nuts
Locking nuts are handled as Zone I, see Figure 3. This zone allows the existence of scattered defects with an equivalent diameter of less than 2mm inside the workpiece, But the distance between two adjacent defects should be greater than 40mm. In an area of ​​100cm2, the number of defects shall not exceed 2. The total number of defects allowed in the locking nut in this area is determined by dividing its maximum diameter (mm) by 70. 3.4.6 Ultrasonic flaw detection of tubular separator drum shall be in accordance with the provisions of 8.4 of JB4730--1994. 4 Ultrasonic shear wave flaw detection of drum welds
4.1 Workpiece
a) There shall be no debris that hinders flaw detection within 100mm on both sides of the weld; b) Coarse-grained material weld joints and austenitic stainless steel weld joints are not suitable for shear wave flaw detection. 4.2 Weld flaw detection and quality assessment
The longitudinal and circumferential welds of the drum are all subjected to 100% ultrasonic flaw detection inspection, and their quality assessment shall be in accordance with the provisions of 9.1 of JB4730-1994: longitudinal welds shall be assessed as Class I, and circumferential welds shall be assessed as Class II. 5 X-ray flaw detection of drum welding
5.1 Workpiece
The weld surface and both sides shall not have debris and surface defects that hinder the quality assessment of radiographic films, such as welding spatter, weld bead and undercut.
5.2 Inspection and acceptance requirements for drum weld joints a) 100% radiographic flaw detection shall be performed on the longitudinal welds of the centrifuge drum and the welds of the separator drum. The weld quality shall be assessed according to the level II of the AB level photography in GB/T3323;
b) The circumferential weld of the centrifuge drum shall be spot-checked by radiographic flaw detection. The number of radiographic flaw detection photos shall not be less than 2 (the length of each photo shall not be less than 200mm), and the length of the spot-checked weld shall not be less than 20% of the total length of the weld. The weld quality shall be assessed according to the level III of the AB level photography in GB/T3323.
6 Ultrasonic longitudinal wave flaw detection of centrifuge and separator shafts and similar parts forgings When the demander requires transverse wave flaw detection for forgings, the supply and demand parties shall negotiate. 6.1 Workpiece
a) The surface roughness Ra value of the workpiece detection surface shall not exceed 6.3μm; b) The workpiece detection surface should not have debris that hinders flaw detection. 6.2 Acceptance requirements
When the diameter of the forging is less than 100mm, sporadic defects with an equivalent diameter of less than 2mm are allowed to exist inside the workpiece: when the diameter is greater than 100mm, sporadic defects with an equivalent diameter of less than 3mm are allowed to exist inside the workpiece. However, the distance between two adjacent defects should be greater than 40mm, and the number of defects on the same straight line shall not exceed 4, and no more than 5 on an area of ​​100cm2. 7 Surface flaw detection of forging drums and shafts
Surface flaw detection refers to magnetic particle and color flaw detection 7.1Workpiece
JB/T9095-1999
a) The detection surface should not have scale, rust, paint layer and other dirt that hinders flaw detection; b) The flaw detection of workpieces should be carried out after the final heat treatment or finishing. 8Flaw detectors
Flaw detectors whose vision does not reach 0.8 cannot participate in the work of radiographic flaw detection and film evaluation; color blind people cannot participate in color flaw detection; the safety protection of flaw detectors shall comply with the provisions of GB/T3323. www.bzxz.net
Flaw detectors must have basic knowledge and experience in the corresponding flaw detection methods. The operation shall be performed by those who have obtained the qualification certificate recognized by the relevant competent departments of the state organs after assessment, and the report issuance shall be the responsibility of those who have obtained the qualification certificate of level II or above of the method. 9Flaw detection report
Flaw detection reports shall be filled in for all kinds of flaw detection inspection results. The contents include: workpiece name, drawing number, material, thickness, surface condition, flaw detection method, specification, implementation standard, qualified level, instrument model, certificate number, name, date and other relevant information. 247
JB/T9095-1999
Appendix A
(Appendix of Biao Xiong)
CS-2 reference test block size and appearance
A1CS-2 standard test block is a flat test block, which consists of two types of test blocks, one is a large flat bottom test block without flat bottom hole, and the other is a test block with a flat bottom hole of 2 to 4 mm in diameter at the bottom.
A2 test block is made of the workpiece material itself, or similar materials such as 45 carbon steel ingot smelted in an electric furnace or open hearth furnace, and is processed and manufactured after forging (forging ratio is not less than 3) and normalizing. A3 When the test block is probed with a sensitivity of 5MHz, 1.6mm flat bottom hole and a signal amplitude equal to 80% of the screen height, no defect signal should appear on the oscilloscope screen, the signal-to-noise ratio should not be less than 6dB(A), and the material attenuation coefficient on the central axis of the test block should not be greater than 4dB(A)/m. A4 The appearance and dimensions of each part of the test block are shown in Table A1. A5 The test block is not allowed to have cracks.
Table A1 CS-2 reference test block dimensions and appearance serial number
Test block number
Aperture d
Distance L
Height L
Outer diameter D
Reference drawing
Test block number
JB/T 9095—1999
Table A1 (end)
Distance L
Aperture d
Height L
Outer diameter D
≥100
≥110
≥110
≥120
≥120
≥140
≥155
Reference drawing
JB/T 9095--1999
Appendix B
(Appendix to the standard)
CS-R type standard test block and its technical requirements
B1CS-R type standard test block is a large flat bottom test block, which is used to measure the acoustic energy loss caused by different curvatures in the flaw detection of forgings with convex cylindrical detection surfaces.
B2There are 14 test blocks in total, of which 1 has a flat detection surface and the other 13 have convex cylindrical surfaces with different curvatures. B3The test block is made of 45 carbon steel ingots smelted in an electric furnace or open hearth furnace, and is processed after forging (forging ratio is not less than 3) and normalizing. B4When the test block is detected with a sensitivity of 5MHz, 1.6mm flat bottom hole, and signal amplitude equal to 80% of the screen height, no defect signal should appear on the oscilloscope screen, the signal-to-noise ratio should not be less than 6dB(A), and the material attenuation coefficient on the central axis of the test block should not be greater than 4dB(A)/m. The appearance and dimensions of each part of the B5 test block are shown in Table B1. No cracks are allowed in the B6 test block.
Table B1 Dimensions and appearance of CS-R standard test blocks
Test block number
75/100
75/125
75/150
75/200
75/300
75/400
75/500
75/600
75/700
75/750
75/800
Detection surface R
Reference figure
[E0. 06 A] -
JB/T 9095—1999
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