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 Posted: Thu 22:22, 13 Jan 2011 Post subject: moncler günstig Radiography of weld defects can b |
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Radiography of weld defects can be seized in the linear thinking of re-
The specified value, is based on economic rather than technical reasons the exposure point of view. 7.2 The proposed two-wire 7.2.1 active use of BS (Pt-W) as quality indicators to monitor the exposure parameters (kV, F). 7.2.2 for the detection of small cracks, use a larger focal length values, so that Ug ≤ Ui. 7.2.3 should use double-trough type image quality indicator to draw the crack sensitivity curve, the crack detection index calculated gc, and evaluation of performance and image quality of photographic film; on the daily weld inspection,[link widoczny dla zalogowanych], such as promoting the use of drum groove quality indicator by 1O. Monitoring according to law through the crack detection rate. 7.2.4 where necessary, change the type of film to improve the detection rate of the crack, the use of particle film to make up for the loss of sensitivity caused by increased kv. 7.2.5 should increase the blackness film, D can take the linear defects were 2.8 hinder higher detection rate. GB3323 - 87 standard class AB blackness under the low limit of D = 1.2, should be raised to 1.5 or 1.8 (according to current rules, with the highest praise of 3.5 compared to the black, D1.2 time contrast to 51% loss). 7.2.6 off \1% of the trough in order to obtain quality indicators such as sensitivity to different thickness of the steel selected parameters of Confucianism recommended values shown in Table 4, were seized when 7.2.7 tendency to weld cracks on some of the original AE conditions,[link widoczny dla zalogowanych], parameters should try to change. Film based on the technology chosen should refer to the latest IIW / ISO draft standard as the quality indicator according to the above recommendations (3), or provided by JISZ3104 contrast sneeze count plus total BS double silk like quality standards and ASTM standards 7.2.8AE test object should be to develop technical requirements for three levels of RT, A class of a ~ very strict; B forging one by one medium, C-class one by one is not strict. The selection of these levels should be based on different ray ray source Ix l ~ ... 1 ●''- ● h ... A t 'A ● ● ____ a steel and weld material type decisions. Necessary, with urge acoustic detection. Depression can fish out reliably at full quality parameter sensitivity is also required to push the value of the provisions of MOU to ensure that the linear missing when called for by AE in-service equipment, products or RT [arts time. Detection must be considered measures of linear defects, according to India through the process parameters and quality parameters should be higher than the AE requirements. 7.2.9 Similarly, the weld in order to meet the requirements of linear defects in the fish out of GB3323-87 standard, some basic parameters, such as Ug, Vmax, D,[link widoczny dla zalogowanych], F and Sw, also want to make the appropriate changes. Note the chart in the Department of cars set Luowu Ni P, Ciofan the experimental results. References (abbreviated) (then 38 li) Then put on the plate C (5) into (19) 1. Temple and using the (7) into (Ig)-like do the same. Obtained (22) a 1 a ÷; ezD a ~) 1ItDTT (22) + (】 ~ a) (2-1) ... by (22) can be canthal see the blackness step plate C light (Dc -D) divided by the degree of a base to remove the fog off parts of the black level (D-~ a) and step thickness difference (TZ - T.) multiplied by the correction factor of its income, you can obtain the blackness level board Evaluation of poor value. Radiographic film directly from the blackness on the determination, be able to find / (1 +13.1). 5 Conclusion In the time-line inspection of steel welds, in order to ensure order Lai leisure dollars of basic characteristics. The current use of the assumed tone of the steps into a simple plate model, according to the film's image through quality evaluation methods are discussed,[link widoczny dla zalogowanych], and its conclusions are as follows: (1) The board recommended level except for its black-level difference average film thickness and the amine . Shí than on assessing the value of l as a new calculation of the 28 amendments to the table the number of fixed Kc Some Numerical TlBP (1-17 \1170. O5853.00.1000.0667, 4. O0. O8840.06485.00.0769-0.0, 6156.00.0709O. 0591 to replace the original parameters used in Dark Tone of dollars according to bud through the film to represent the image quality. (2 defined by the thickness and width are very small step board evaluation values and the funerary pictures produced in the film depends on the chosen quality factor of radiation energy line P / (1 + n) equal to back. In addition, pursuant to edge clear evaluation value can be identified with the penetrometer relationship Mo minimum diameter. (3) showed a very wide degree of difference between the black level demand pull small basking trap level simulation of the evaluation board directly, using the correction factor is necessary. This correction factor, the exposure time in the practical context of ensuring the energy,[link widoczny dla zalogowanych], spring rejection of the vast thickness of the specimen to amend. References (omitted) Huiming rubber translated from Japanese non-destructive test No. 4l Volume No. 5 (25l ~ 259 页)
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