Nickel-based alloy 625 +F65 composite thick-wall pipe butt weld PAUT detection method
A technology of nickel-based alloys and butt welds, which is applied in the field of detection, can solve the problems of not being able to meet the full coverage of welds, and the detection of welds cannot achieve the expected results, so as to improve the service life of crude oil and prevent corrosion.
Pending Publication Date: 2022-07-05
CHINA MERCHANTS HEAVY IND JIANGSU
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[0006] In the published document CN201720339741-A RT ray non-destructive testing layout structure of semi-circular pipe fillet welds, conventional RT testing is used, even if the gamma source of Ir192 is used, it cannot penetrate. If UT testing is used, only direct waves can be used. It also cannot satisfy the full coverage of the weld seam, and the detection of the weld seam cannot achieve the desired effect
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[0035] In order to deepen the understanding of the present invention, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.
[0036] According to the acceptance requirements of the project, combined with the welding joint parameters (see attached figure 1 ), designed and fabricated comparative test blocks for sensitivity and TCG calibration. There are 4 comparison test blocks in total. The artificial reflectors are distributed in typical areas such as the outer surface of the weld, the fusion surface, the middle of the weld, and the root of the weld. The weld is a φ3 transverse hole, and the upper surface and the root are 2×2 grooves. like Figure 3 to Figure 6 shown;
[0037] Make a scanning plan: Use the Olympus Omni PC 5.4 simulation software to conduct a ...
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Abstract
The invention discloses a nickel-based alloy 625 + F65 composite thick-wall pipe butt weld PAUT detection method. The method comprises the following steps that 1, a weld is scanned; 2, manufacturing two test tube weld joints equivalent to the product as verification test blocks; 3, carrying out longitudinal detection on the test block; step 4, performing transverse scanning as supplement; 5, inputting the parameters into the instrument; 6, a DAC curve is established, scanning detection is conducted on the upper portion, the middle lower portion and the root portion of the weld joint, and results are recorded. The method can completely replace a conventional RT detection method used by a high-pressure pipe, important areas such as the outer surface, the fusion surface, the center and the root of a welding seam are completely covered, defects are judged according to collected data, and then the defects are positioned, qualitative and quantitative; and finally, whether the quality of the detected welding seam meets the acceptance requirement or not is judged, and the data collected by the method can be stored and recorded.
Description
technical field [0001] The invention relates to the field of detection, in particular to a method for detecting the butt weld of a nickel-based alloy 625+F65 composite thick-walled pipe PAUT. Background technique [0002] With the rapid development of the steel structure manufacturing industry, there are more and more industrial welding products, and the welding technology continues to deepen and develop. How to control and inspect the welding quality of metal products is also more and more required to meet customer needs and enhance brand effect. higher. Welding inspection is a close combination of total quality management and NDT technology. In addition to personnel, equipment and management, which are important factors for controlling quality and ensuring safe product operation, suitable welding inspection methods and testing techniques are also very important. Especially with the emergence of new materials and new welding processes, the matching detection methods and de...
Claims
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Login to View More IPC IPC(8): G01N29/04G01N29/30G01N29/48
CPCG01N29/04G01N29/30G01N29/48
Inventor 郑中举王永强刘其勋孙学荣
Owner CHINA MERCHANTS HEAVY IND JIANGSU