Supersonic flaw detection method of weld joint

An ultrasonic and creeping wave probe technology, applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, etc., can solve the problems of radiographic flaw detection clarity, decreased sensitivity, difficult radiation, low flaw detection accuracy, etc., to avoid detection blind spots and ensure detection. The effect of accuracy

Inactive Publication Date: 2014-07-16
SEPCOIII ELECTRIC POWER CONSTR CO LTD
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Problems solved by technology

[0007] C. The accuracy of flaw detection is not high. With the increase of the detection size, the clarity and sensitivity of radiographic flaw detection drop sharply
In particular, the ray can only obtain the top view informat

Method used

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Embodiment Construction

[0015] 1. Preparation for data review

[0016] Before implementing the inspection, it is necessary to know more about the condition of the workpiece, the condition of the weld, and the conditions of the defects to be detected, which will help to design a better inspection plan. This information includes: For workpieces in progress, you should know the design and manufacturing specifications, methods of inspection and testing items, manufacturing processes, equipment, and environmental conditions; for equipment in use, you should also understand the operating conditions, fault conditions, and problems found in the last inspection; It is necessary to understand the weldability of the material, the structure of the weld, the welding method, the site conditions during welding, and the types of defects that need to be detected.

[0017] 2. Preparation of workpiece to be inspected

[0018] Check the appearance of the weld, width and height of the reinforcement, whether the thicknes...

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Abstract

A supersonic flaw detection method of a weld joint is characterized in that another two detection channels are arranged on a TOFD detector, creep wave probe scanning of the upper portion of the weld joint and transverse wave probe scanning of the lower portion of the weld joint are carried out while TOFD scanning in order to simultaneously carry out three detections. The respective advantages of UT detection and the TOFD detection are fully utilized, and the whole weld joint can be all-directionally detected through one time scanning. The method has the advantages of high detection efficiency and high accuracy.

Description

technical field [0001] The invention relates to ultrasonic detection of weld seams of high-alloy steel pipelines in power station boilers, and other special material ultrasonic flaw detection can also be referred to for use. Background technique [0002] In power production, safety is above all else. There are a large number of high-temperature and high-pressure pipelines in thermal power stations, and their dangers are well known. And there are many welds in the pipeline, which is the weakest link of pipeline safety. Therefore, it is a great responsibility to do a good job in welding inspection during the installation stage of the power station. [0003] The evaluations of foreign research institutions on the detection rate of various detection methods are: manual UT, 50-70%; TOFD, 70-90%; mechanical scanning UT+TOFD, 80-95%. Radiographic detection 75%. However, because manual UT is affected by human factors, its use has been strictly restricted in most important pipeli...

Claims

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Application Information

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IPC IPC(8): G01N29/04
Inventor 刘向东王立新
Owner SEPCOIII ELECTRIC POWER CONSTR CO LTD
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