Ultrasonic flaw detection method of heavy-thickness austenitic stainless steel welded splices

A technology of austenitic stainless steel and welded joints, applied in the direction of using sound waves/ultrasonic waves/infrasonic waves to analyze solids, instruments, and analysis materials, etc.

Active Publication Date: 2017-07-07
西安核设备有限公司
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AI Technical Summary

Problems solved by technology

At present, there is no corresponding mature and complete UT detection technology at home and abroad. For this reason, it is urgent to develop a detection method that can meet the requirements of welded joints of spent fuel transportation containers.

Method used

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  • Ultrasonic flaw detection method of heavy-thickness austenitic stainless steel welded splices
  • Ultrasonic flaw detection method of heavy-thickness austenitic stainless steel welded splices
  • Ultrasonic flaw detection method of heavy-thickness austenitic stainless steel welded splices

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Embodiment Construction

[0074] The technical solutions of the present invention will be further described in detail below through specific examples.

[0075] In this embodiment, an ultrasonic flaw detection method for large-thickness austenitic stainless steel welded joints uses a longitudinal wave double-crystal angle probe to perform oblique-wave direct-wave method on single-sided welds of austenitic stainless steel with a thickness of ≤163 mm from one side and both sides carry out a scan test;

[0076] During scanning, the weld seam is layered in the thickness direction, each layer is combined with probes with different focal lengths and angles for detection, and an area covered by each other is set between adjacent two layers of probes; the specific steps are as follows:

[0077] (1) Delamination in the thickness direction

[0078] The welds with a thickness of ≤163mm are divided into three layers in the thickness direction for inspection. The detection range of each layer is: the first layer de...

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Abstract

The invention belongs to the technical field of ultrasonic detection of austenitic stainless steel welded seams, and specifically relates to an ultrasonic flaw detection method of heavy-gauge austenitic stainless steel welded splices. The method adopts longitudinal-wave double-crystal angle probes to conduct a method of oblique wave and direct wave from two sides on one side of welded seams of an austenitic stainless steel with the thickness less than 163mm. During the process of scanning, the welded seam is laminated in the direction of thickness and the combination in every layer uses probes in different focal lengths and angles to detect, meanwhile, an overlapped area is positioned between two adjacent layers of probes. By testing capabilities of the detection system, according to the technical scheme, the detection system fully meets the ultrasonic detection requirements of welded seams of heavy-gauge austenitic stainless steels which are the preparation materials of spent fuel transfer casks.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic detection of austenitic stainless steel welds, and in particular relates to an ultrasonic flaw detection method for large-thickness austenitic stainless steel welded joints. Background technique [0002] The spent fuel transport container is mainly welded by austenitic stainless steel inner cylinder, outer cylinder and upper and lower end forgings, the structure see figure 1 , lead is poured between the inner and outer cylinders for shielding. See Table 1 for the components, materials, thickness and welding methods of the inspected area. [0003] Table 1 [0004] [0005] CNSC Spent Fuel Transport Container Technical Conditions (106241E1001JT) requires: "The operation method of the welded joints in the container with a thickness greater than 50mm shall be implemented in accordance with ASME Volume V, Chapter 5, and the acceptance criteria shall be in accordance with ASME Volume VIII, Part ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
CPCG01N29/04G01N2291/0234
Inventor 王振忠陈建春赵琨
Owner 西安核设备有限公司
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