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A Method for Measuring the Loss of Ultrasonic Sound Energy in Small-diameter Tubes

An ultrasonic and small-diameter tube technology, which is used in the analysis of solids using sonic/ultrasonic/infrasonic waves, which can solve the problems of leaking welds and not considering the internal arc scattering of small-diameter tubes.

Active Publication Date: 2016-04-27
国能锅炉压力容器检验有限公司
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Problems solved by technology

However, the above two regulations only consider the amplitude attenuation caused by the depth of the defect, but do not consider the scattering of ultrasonic sound energy by the inner arc of the small-diameter pipe, which is likely to cause missed judgments on internal defects of the weld when using a reflected wave detection

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  • A Method for Measuring the Loss of Ultrasonic Sound Energy in Small-diameter Tubes

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Embodiment Construction

[0026] Depend on figure 1 As shown, the embodiment steps are as follows:

[0027] 1) Preparation of probe and ultrasonic inner arc sound energy loss measurement test block group:

[0028] Probe selection: Select a small-diameter tube ultrasonic transmitting probe 1 and a small-diameter tube ultrasonic receiving probe 2 with specifications of 5P6×6K2.5, leading edge of 5mm, and delay of 2.60μs. The probes are connected to the CTS- 9002 digital ultrasound machine;

[0029] Select the ultrasonic inner arc sound energy loss measurement test block: when the inspected workpiece 4 is a small-diameter tube of 20g and Φ57×8mm, select a group of ultrasonic inner arc sound energy loss measurement test blocks 3 made of the same material as the inspected workpiece 4 , one group includes 4 lengths of 100mm, width of 15mm, and ultrasonic inner arc sound energy loss measurement test blocks 3 with different thicknesses. The thicknesses of the four test blocks are 4mm, 6mm, 8mm, and 10mm resp...

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Abstract

The invention relates to a method for measuring inner arc ultrasonic sound energy loss of a small diameter tube. The method comprises the following steps: 1) choosing one small diameter tube ultrasonic emitting probe and one small diameter tube ultrasonic receiving probe which have the same parameters, and choosing one group of inner arc ultrasonic sound energy loss measurement test blocks; 2) measuring the highest amplitude value of ultrasonic wave in each measurement test block after being reflected through the bottom surface; 3) drawing a amplitude-thickness reference curve; 4) measuring the highest amplitude value e of the ultrasonic wave after being reflected through the bottom surface of the measured workpiece-small diameter tube; and 5) finding out the amplitude value f, corresponding to the thickness value of the measured workpiece-small diameter tube, from the amplitude-thickness reference curve, and calculating the sound energy loss delta C of the ultrasonic wave on the inner wall of the small diameter tube through the formula of delta C=2*(f-e). The method has the activities that as the sound energy loss of the ultrasonic wave on the inner wall of the small diameter tube is measured, and the measured value is combined with the sound energy loss of the ultrasonic wave on the inner wall of the small diameter tube, the defects of circular butt welding seams of the small diameter tube are accurately reflected, and the leakage of the originally wasted defects is avoided.

Description

technical field [0001] The invention relates to a method for measuring the loss of ultrasonic inner arc sound energy of a small-diameter tube. Background technique [0002] Small-diameter tubes are boiler heating surface tubes with outer diameter D = 32-89mm and wall thickness t = 4-14mm. Most superheaters, economizers, reheaters, and water-cooled walls in thermal power plants are within the above range. A newly built unit contains a large number of small-diameter pipe welds. At present, the detection methods used for the circumferential butt welds of small-diameter pipes are radiographic inspection and ultrasonic inspection. Compared with radiographic testing, ultrasonic testing technology has a higher detection rate of internal harmful defects such as cracks and lack of fusion in small-diameter pipe welds. In recent years, it has been widely used in the installation and maintenance inspection of large boilers. At present, the standard regulations for ultrasonic testing pr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/11
Inventor 王强刘长福牛晓光郝晓军郑相锋李树军王志永张广兴代小号杨新军
Owner 国能锅炉压力容器检验有限公司
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