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Ultrasonic testing process for thick-wall container

A thick-walled vessel and ultrasonic technology, applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, can solve the problems of increased plate thickness, missed area defect detection, and low detection rate of cracks in thick specimens. Destructive, Accuracy-Increasing Effects

Inactive Publication Date: 2016-01-13
NANJING JIAYE INSPECTION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the detection rate of cracks in thick test pieces is low due to the unclear display of image details of thick workpieces
[0006] 2) It is suitable for detecting thinner workpieces but not for thicker workpieces; as the plate thickness increases, the absolute sensitivity of radiography decreases
That is to say, if radiography is used for thick workpieces, the possibility of missing small-sized defects and some area-type defects will increase.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: An ultrasonic testing process for thick-walled containers, comprising the following steps:

[0031] 1) According to the wall thickness of the detection container, the material is low-alloy steel, the pressure is 1.7MPa, the wall thickness is 42mm, and the diameter is 3m, the class III container is ultrasonically tested; the qualified level of the detection container is determined according to the solid capacity regulation. The detection technology level is Class B, Class A and Class B welds are 100% tested, and the qualified level is Class I.

[0032] 2) According to the characteristics of the detection container, determine the surface attenuation and material attenuation during the detection process. This type of container is made of low-alloy steel, and the wall thickness is 42mm. According to NB / T47013.3-2015, the frequency of the angle probe is 2.5MHz, and the sound path does not exceed 200mm, regardless of material attenuation. Since the diameter of th...

Embodiment 2

[0039] Example 2: An ultrasonic testing process for thick-walled containers, comprising the following steps:

[0040] 1) According to the wall thickness of the detection container, the material is low-alloy steel, the pressure is 1.7MPa, the wall thickness is 26mm, and the diameter is 5m, the class III container is ultrasonically tested; the qualified level of the detection container is determined; the detection technology level is determined according to the solid capacity regulations. It is Class B, 100% inspection of Class A and Class B welds, and the qualified level is Class I.

[0041] 2) According to the characteristics of the detection container, determine the surface attenuation and material attenuation in the detection process; this type of container is low-alloy steel, because the wall thickness is 26mm, according to NB / T47013. The distance does not exceed 200mm and does not consider material attenuation. Since the diameter of the container is 5m and the radius of...

Embodiment 3

[0048] Example 3: An ultrasonic testing process for thick-walled containers, comprising the following steps:

[0049] 1) According to the wall thickness of the detection container, the material is low-alloy steel, the pressure is 1.7MPa, the wall thickness is 84mm, and the diameter is 3m, the class III container is ultrasonically tested; the qualified level of the detection container is determined according to the solid capacity regulation. The detection technology level is Class B, Class A and Class B welds are 100% tested, and the qualified level is Class I.

[0050] 2) According to the characteristics of the detection container, determine the surface attenuation and material attenuation in the detection process; this type of container is low-alloy steel because the wall thickness is 84mm, according to NB / T47013. The distance does not exceed 200mm and does not consider material attenuation. Since the diameter of the container is 3m and the radius of curvature is 1500mm, w...

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Abstract

The invention discloses an ultrasonic testing process for a thick-wall container. Based on the actual conditions of the thick-wall container, the ultrasonic testing process eventually presents testing results of the thick-wall container via determination of qualifying grades, analysis of curved surface attenuation and material attenuation, selection of a detection probe, adjustment of apparatus sensitivity, determination of a detection area, determination of the moving region of the probe, determination of apparatus defects and reinspection. The ultrasonic testing process provided by the invention can effectively avoid the situation of missed detection of area type defects in thick wall detection caused by reasons like the shape and size of a defect and transillumination conditions of ray detection; and 100% ultrasonic reinspection increases accuracy of the detection results and greatly reduces destructiveness of hazard defects like cracks.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing of devices, in particular to an ultrasonic testing process for thick-walled containers. Background technique [0002] The state vigorously develops the real economy, provides strong support for the manufacturing industry, and also puts forward the importance of quality assurance. Therefore, all kinds of large-scale manufacturers vigorously update welding technology, and put forward higher requirements for non-destructive testing, because non-destructive testing is the most intuitive and powerful proof of welding quality. [0003] At present, when thick-walled containers are mass-produced on the market, due to their large wall thickness, it is difficult to accurately detect thick-walled containers using traditional radiographic inspection methods, and the detection accuracy is greatly reduced, which cannot meet the sensitivity requirements of non-destructive testing. . [0004] Tr...

Claims

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Application Information

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IPC IPC(8): G01N29/04
Inventor 胡家富向阳缪斌陈荣华艾伟施鹏飞
Owner NANJING JIAYE INSPECTION ENG
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