Method for detecting weld seam of thin-wall small diameter tube by adopting phased array ultrasonic combination technology

Abstract

The invention provides a method for detecting a weld seam of a thin-wall small diameter tube by adopting a phased array ultrasonic combination technology. The method for detecting the weld seam of the thin-wall small diameter tube with the wall thickness of more than or equal to 3.5mm and smaller than or equal to 7mm by adopting the phased array ultrasonic combination technology is characterized in that the setting of a test block passing a phased array ultrasonic system is subjected to field detection by adopting phased array ultrasonic equipment through a phased array probe; the detection result is obtained by the flow of evaluating and issuing a detecting report. The method disclosed by the invention has the advantages of simplicity and practicality in operation, no radiation, no pollution, high detection efficiency, high quantitative precision, small influence from human factors and low possibilities of missing evaluation and misjudgment; the detection result is displayed in a three-dimensional image form, so the visibility and the understandability are realized. The method is suitably applied for detecting the weld seam of the thin-wall small diameter tube.

Description

technical field [0001] The invention relates to a thin-wall small-diameter pipe weld seam ultrasonic detection process, in particular to a method for detecting thin-wall small-diameter pipe weld seam by using phased array ultrasonic combination technology. Background technique [0002] According to the "National Medium and Long-Term Science and Technology Development Plan (2006-2020)", early warning and rescue of major production accidents in the field of public safety are priority topics. Pressure equipment includes various boilers, pressure vessels and pressure pipes, etc., which are important production equipment and are closely related to national economic production and people's daily life. However, pressure-bearing equipment often has the characteristics of high temperature, high pressure and toxic media. Once an accident occurs, the consequences will be extremely serious. In order to avoid possible quality accidents, a large number of non-destructive testing technolo...

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Problems solved by technology

[0005] Radiographic inspection is characterized by being sensitive to volume-type defects (such as pores), unclear to harmful area-type defects (such as cracks, lack of fusion), and easy to miss inspection. The advantage is that the defect display is intuitive, but there are radiation, Pollution, harmful to the human body, cross-operation cannot be carried out, test results cannot be issued on site, the detection efficiency is low, and the construction schedule is easily affected

[0006] Conventional ultrasonic testing is characterized by being sensitive to dangerous area-type defects, not sensitive to volume-type defects, easy to miss detection, no radiation during the detection process, can issue detection results on site, high detection efficiency, and can carry out cross-operation. The disadvantages are Using single-angle acoustic beam detection, the detection results are not displayed in the form of images, but in the form of A-scans, which is not intuitive, and the stored data cannot be played back dynamically. The technical level of the detection personnel is high, and the detection results are greatly affected by human factors. , Omissions and misjudgments often occur, which affect the quality of the project, especially for thin-walled small-diameter pipe welds with a wall thickness greater than or equal to 3.5mm and less than or equal to 7mm. It is very difficult to use single-angle primary wave and secondary wave detection. Therefore, the welding seams of thin-walled small-diameter pipes in this range are basically inspected by radiographs, which aggravates the inspection task, delays the progress of the project, and makes it difficult to ensure that the project is completed on schedule.

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