CN104122275A - Radiographic method for 9% Ni steel - Google Patents
Radiographic method for 9% Ni steel Download PDFInfo
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- CN104122275A CN104122275A CN201410307936.9A CN201410307936A CN104122275A CN 104122275 A CN104122275 A CN 104122275A CN 201410307936 A CN201410307936 A CN 201410307936A CN 104122275 A CN104122275 A CN 104122275A
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Abstract
The invention provides a radiographic method for 9% Ni steel. The radiographic method comprises the following steps: 1, adjusting an X-ray machine so that the focal length of the X-ray machine is adjusted to 600mm and aligned to the detection position of a 9% Ni steel workpiece; 2, arranging a film and an intensifying screen, placing the film on the back of the detection position and arranging the intensifying screen in front of the film, wherein lead foils which are 0.03mm thick are arranged on the front and rear screens of the intensifying screen respectively; 3, arranging a lead foil filter plate, namely arranging the lead foil filter plate having the thickness of d in a transmission path between a window of the X-ray machine and the film, wherein d is greater than or equal to 0.06mm and smaller than or equal to 0.2mm; 4, carrying out ray exposure under the condition that the tube voltage of the X-ray machine is set to be 220KV and the exposure time is adjusted to be 25d minutes according to the thickness of the lead foil filter plate; and 5, performing developing on the exposed film at the temperature of 20+/-2 DEG C for 6 minutes.
Description
Technical field
The invention provides a kind of detection method for quality of welding line, especially a kind of for the radiographic X detection method of 9%Ni steel and realize the X-ray machine X of the method.
Background technology
Along with socioeconomic development, the demand of the energy is increasing, construction project constantly increases, new science and technology new material is also constantly used in engineering project, the non-ferrous metals such as aldary, titanium alloy, zircaloy, nickel alloy use more and more in Petrochemical Industry, structure also becomes increasingly complex, and following, detection means also must improve thereupon.
9%Ni steel sensitivity of film subject matter is the requirement that on egative film, mother metal part and weld seam part blackness can not meet standard/specification simultaneously, and conventional double film technique or the method for using short time, high voltage to increase transillumination tolerance solve this problem at present.
But adopt two Film Dosimeters to detect, because the tolerance of conventional film is improper, therefore, can adopt synchronized pair of Film Dosimeter, between two films, add certain thickness pair of film lead foil screen of folder, regulate two film intensifying screen thickness, make that anter welded seam area blackness reaches 2.0～4.0, rear panel mother metal region blackness also reaches 2.0～4.0, this is conventional gimmick in the radiography of 9Ni steel at present.But, making like this to detect required film quantity double, cost significantly improves, and darkroom disposal amount increases simultaneously, and the first-time qualification rate of egative film will decline, and sticking patch probability increases, and affects detection progress.
In the time using short time, high voltage to increase the method for transillumination tolerance, because the transillumination equivalent coefficient difference of mother metal region and welded seam area is larger, the constraint of existing equipment and field condition can not too improve tube voltage (or high-energy checkout equipment) and reduce exposure increases tolerance.
Summary of the invention
The technical problem to be solved in the present invention is that while adopting two Film Dosimeter, quantity is double, cost is high, while adopting short time, high voltage to increase the method for transillumination tolerance, existing equipment and field condition is had relatively high expectations.
In order to solve the problems of the technologies described above, the invention provides a kind of 9%Ni steel radiographic method, comprise the steps:
Step 1, regulates X-ray production apparatus, is 600mm, and aims at the detection position of 9%Ni steel workpiece by the focus adjustment of X-ray production apparatus;
Step 2, arranges film and intensifying screen, places film, and shield the intensifying screen that is 0.03mm thickness lead foil before and after arranging at the back side of detection position before film;
Step 3, arranges lead foil filter band, and it is the lead foil filter band of d that thickness is set on the transmission path between window and the film of X-ray production apparatus, wherein, and 0.06mm≤d≤0.2mm;
Step 4, carries out x ray exposure x, and the tube voltage of setting X-ray production apparatus is 220KV, and regulating the time shutter according to the thickness of lead foil filter band is 25d minute;
Step 5, develops to the film after exposure, and setting development temperature is 20 ± 2 DEG C, and development time is 6 minutes.
Adopt, on the transmission path between window and the film of X-ray production apparatus, lead foil filter band is set, can carry out filtering to the ray of transmission, sponge the low-yield ray that 9%Ni steel mother metal region blackness is had to considerable influence, and can reduce limit erosion scattering, the density difference of 9%Ni steel mother metal region and welded seam area is reduced in the controlled range meeting the requirements (the maximum density difference of weld seam and mother metal is 1.55); Adopt the tube voltage of X-ray production apparatus to be set to 220KV, can improve the effective energy of ray.
Scheme as a further improvement on the present invention, lead foil filter band is arranged between the window place or 9%Ni steel workpiece and film of X-ray production apparatus.Adopt lead foil filter band is arranged between the window place or 9%Ni steel workpiece and film of X-ray production apparatus, can effectively carry out filtering to ray.
Scheme as a further improvement on the present invention, the thickness d=0.13mm of lead foil filter band.When the thickness of lead foil filter band is set to 0.13mm,, between 1.27～1.3, both meets and be less than controllable values 1.55 in the density difference scope of middle part, left end and the right end position of film, again within the scope of effective identification.
The equipment installing structure of this method comprises X-ray production apparatus, chuck and lead foil filter band, and described chuck is fixed on the window place of X-ray production apparatus, and described lead foil filter band is fixed on chuck, and lead foil filter band is sealed on the window of X-ray production apparatus.Window place at X-ray production apparatus arranges lead foil filter band, becomes one structure, and can further increase work efficiency, but also can on chuck, change according to actual needs the lead foil filter band of different-thickness.
The thickness of lead foil filter band is 0.06mm≤d≤0.2mm.The thickness of lead foil filter band is arranged in the scope of 0.06～0.2mm, makes the blackness scope control of film between 1.92～1.1, can meet the standard-required that blackness scope is less than 2.0.
And the thickness d=0.13mm of lead foil filter band.When the thickness of lead foil filter band is set to 0.13mm,, between 1.27～1.3, both meets and be less than controllable values 1.55 in the density difference scope of middle part, left end and the right end position of film, again within the scope of effective identification.
Beneficial effect of the present invention is: (1) adopts, on the transmission path between window and the film of X-ray machine X, lead foil filter band is set, can sponge the low-yield ray that 9%Ni steel mother metal region blackness is had to considerable influence, and can reduce limit erosion scattering, the density difference of 9%Ni steel mother metal region and welded seam area is reduced in the controlled range meeting the requirements; (2) adopt the tube voltage of X-ray machine X to be set to 220KV, can improve the effective energy of ray; (3) when the thickness of lead foil filter band is set to 0.13mm,, between 1.27～1.3, both meets and be less than controllable values 1.55 in the density difference scope of middle part, left end and the right end position of film, again within the scope of effective identification; (4) at the window place of X-ray production apparatus, lead foil filter band is set, becomes one structure, can further increase work efficiency, but also can on chuck, change according to actual needs the lead foil filter band of different-thickness.
Brief description of the drawings
Fig. 1 is method flow diagram of the present invention;
Fig. 2 is equipment installing structure schematic diagram of the present invention.
Embodiment
As shown in Figure 1,9%Ni steel radiographic method of the present invention, comprises the steps:
Step 1, regulates X-ray machine X, is 600mm, and aims at the detection position of 9%Ni steel workpiece by the focus adjustment of X-ray machine X;
Step 2, arranges film and intensifying screen, places film, and shield the intensifying screen that is 0.03mm thickness lead foil before and after arranging at the back side of detection position before film;
Step 3, arranges lead foil filter band, and it is the lead foil filter band of d that thickness is set on the transmission path between window and the film of X-ray machine X, wherein, and 0.06mm≤d≤0.2mm;
Step 4, carries out x ray exposure x, and the tube voltage of setting X-ray machine X is 220KV, and regulating the time shutter according to the thickness of lead foil filter band is 25d minute;
Step 5, develops to the film after exposure, and setting development temperature is 20 ± 2 DEG C, and development time is 6 minutes.
In the time that the method is carried out to contrast test, 9%Ni Steel material thickness is 15.8mm, examination criteria is JB/T4730-2005.2, X-ray machine X adopts EGS2-250, before and after intensifying screen, screen is 0.03mm lead foil, focal length is 600mm, in the time not adopting lead foil filter band, film adopts AGFA-C4, time shutter is 2.5min (meeting the requirement of JB/T4730-2005.02AB level to minimum exposure amount), and tube voltage is selected 230KV, 20 ± 2 DEG C of development temperatures, development time 6min, the film density result obtaining is as shown in table 1:
Table 1
In the time adopting lead foil filter band, film adopts AGFA-C7, tube voltage 220KV (increasing with respect to conventional sense method energy), for different filter band thickness, the film density result that suitably adjustment time shutter t (adopting 2.5min, i.e. t=25d when the thick lead foil of 0.1mm) obtains is as shown in table 2:
Table 2
As can be seen from Table 1, selecting the film that tolerance is larger can reduce the density difference (being 0.97 to the maximum) of 9%Ni steel mother metal and weld seam, and can meet the requirement of examination criteria/technique to photographic density, is a kind of feasible Optimized Measures.But exposure parameter is higher, can not meet the requirement of construction to progress, and also higher to the requirement of equipment, according to the status of equipment of unit and field condition restriction, this kind of optimal way is not suitable for this project implementation.
As can be seen from Table 2, adopt the lead foil filter band of 0.06～0.2mm thickness to carry out filtering, and the tube voltage of X-ray machine X is set to 220KV, improve the effective energy of ray, can carry out filtering to the ray of transmission, sponge the low-yield ray that 9%Ni steel mother metal region blackness is had to considerable influence, and can reduce limit erosion scattering, the density difference of 9%Ni steel mother metal region and welded seam area is reduced in the controlled range meeting the requirements (the maximum density difference of weld seam and mother metal is 1.55).
In order further to improve the dirigibility using, lead foil filter band can be arranged between the window place or 9%Ni steel workpiece and film of X-ray machine X.Adopt lead foil filter band is arranged between the window place or 9%Ni steel workpiece and film of X-ray machine X, can effectively carry out filtering to ray, improved the dirigibility that method is used.
In order further to improve filter effect, thickness that can lead foil filter band is set to 0.13mm.When the thickness of lead foil filter band is set to 0.13mm,, between 1.27～1.3, both meets and be less than controllable values 1.55 in the density difference scope of middle part, left end and the right end position of film, again within the scope of effective identification.
As shown in Figure 2, the photographic ray machine that the present invention adopts, comprises X-ray production apparatus, chuck and lead foil filter band, and chuck is fixed on the window place of X-ray production apparatus, and lead foil filter band is fixed on chuck, and lead foil filter band is sealed on the window of X-ray production apparatus.Window place at X-ray production apparatus arranges lead foil filter band, becomes one structure, and can further increase work efficiency, but also can on chuck, change according to actual needs the lead foil filter band of different-thickness.
In order further to limit lead foil filter band usable range, the thickness of lead foil filter band is set to 0.06mm≤d≤0.2mm, and wherein, d is the thickness of lead foil filter band.The thickness of lead foil filter band is arranged in the scope of 0.06～0.2mm, makes the blackness scope control of film between 1.92～1.1, can meet the standard-required that blackness scope is less than 2.0.
In order further to improve filter effect, the thickness d=0.13mm of lead foil filter band, wherein, d is the thickness of lead foil filter band.When the thickness of lead foil filter band is set to 0.13mm,, between 1.27～1.3, both meets and be less than controllable values 1.55 in the density difference scope of middle part, left end and the right end position of film, again within the scope of effective identification.
To two 160,000 cubes of low temperature storage tanks of certain LNG liquefied natural gas (LNG) receiving station, this method detects, effectively solve under existing equipment condition, how in the situation that not increasing cost and workload, obtain the way that meets the radiographic film that meets Specification, this saves than conventional at present two film methods the film cost that half is many, also reduce sticking patch amount, accelerated the progress of ray detection.
Claims (4)
1. a 9%Ni steel radiographic method, is characterized in that, comprises the steps:
Step 1, regulates X-ray production apparatus, is 600mm, and aims at the detection position of 9%Ni steel workpiece by the focus adjustment of X-ray production apparatus;
Step 2, arranges film and intensifying screen, places film, and shield the intensifying screen that is 0.03mm thickness lead foil before and after arranging at the back side of detection position before film;
Step 3, arranges lead foil filter band, and it is the lead foil filter band of d that thickness is set on the transmission path between window and the film of X-ray production apparatus, wherein, and 0.06mm≤d≤0.2mm;
Step 4, carries out x ray exposure x, and the tube voltage of setting X-ray production apparatus is 220KV, and regulating the time shutter according to the thickness of lead foil filter band is 25d minute;
Step 5, develops to the film after exposure, and setting development temperature is 20 ± 2 DEG C, and development time is 6 minutes.
2. 9%Ni steel radiographic method according to claim 1, is characterized in that: described lead foil filter band is arranged between the window place or 9%Ni steel workpiece and film of X-ray production apparatus.
3. 9%Ni steel radiographic method according to claim 1 and 2, is characterized in that: the thickness d=0.13mm of described lead foil filter band.
4. 9%Ni steel radiographic method according to claim 1 and 2, it is characterized in that: the equipment installing structure of this method comprises X-ray production apparatus, chuck and lead foil filter band, described chuck is fixed on the window place of X-ray production apparatus, described lead foil filter band is fixed on chuck, and lead foil filter band is sealed on the window of X-ray production apparatus.
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| CN201410307936.9A CN104122275A (en) | 2014-06-30 | 2014-06-30 | Radiographic method for 9% Ni steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827977A (en) * | 2017-11-22 | 2019-05-31 | 宁波至信检测技术有限公司 | The detection method of X-ray of transillumination component |
| CN110987980A (en) * | 2019-10-30 | 2020-04-10 | 四川航天川南火工技术有限公司 | High-definition high-tolerance transillumination method for complex-structure initiating explosive device |
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| CN103207191A (en) * | 2013-03-25 | 2013-07-17 | 国家电网公司 | Method for accurately controlling photographic density during radiographic inspection |
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2014
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827977A (en) * | 2017-11-22 | 2019-05-31 | 宁波至信检测技术有限公司 | The detection method of X-ray of transillumination component |
| CN110987980A (en) * | 2019-10-30 | 2020-04-10 | 四川航天川南火工技术有限公司 | High-definition high-tolerance transillumination method for complex-structure initiating explosive device |
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Application publication date: 20141029 |