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Dissimilar metal welding line ultrasonic creeping wave testing method

A technology of dissimilar metals and detection methods, applied in the field of ultrasonic detection, can solve the problems of inability to detect small opening cracks, missed inspections, and inability to determine the size of defects in the height direction, etc.

Active Publication Date: 2010-06-23
THIRD QINSHAN NUCLEAR POWER
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Problems solved by technology

Among them, the liquid penetrant testing method is a method of testing the surface of the weld with liquid. This method can only detect the opening defects on the outer surface of the weld, but cannot detect buried defects, and it is impossible to determine the size of the detected defects in the height direction.
Both the volumetric detection method RT and the volumetric detection method UT can detect most defects, but when the direction of the defect is at a specific angle to the direction of the ray, there will be missed detection, and this method cannot detect small opening cracks

Method used

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  • Dissimilar metal welding line ultrasonic creeping wave testing method
  • Dissimilar metal welding line ultrasonic creeping wave testing method
  • Dissimilar metal welding line ultrasonic creeping wave testing method

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Embodiment Construction

[0022] An ultrasonic creeping wave detection method for dissimilar metal welds, comprising the steps of:

[0023] (1) Instrument depth measurement calibration

[0024] The depth measurement and calibration of the ultrasonic instrument is carried out by using the special depth measurement calibration test block. The ultrasonic instrument includes a creeping wave probe and a computer for data processing, and the creeping wave probe is a known creeping wave probe. Such as figure 1 , figure 2 , image 3 As shown, the special depth measurement calibration test block is a small section of the pipe along its axial direction. Three flat-bottomed holes at different depths from the circumferential surface are drilled on the top of the special depth measurement calibration test block. The three flat-bottomed holes are all parallel to the The pipe is axially drilled from the top of the test block to the centerline of the weld, and the diameter of the flat-bottomed hole is 2 mm. The ...

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Abstract

The invention belongs to an ultrasonic creeping wave testing method, particularly relates to a dissimilar metal welding line ultrasonic creeping wave testing method, which comprises the following steps: (1) calibrating instrument depth measurement, (2) demarcating sensitivity, and (3) testing. The invention has the effects that: (1) the effect of creeping wave for defect depth measurement is that the creeping wave can test the depth of 0.5 to 9mm, and the depth measurement error is plus and minus 0.5mm, (2) the effect of creeping wave for defect height measurement is that the creeping wave can perform the height measurement for the planar defect with the self height of larger than or equal to 2mm, with the measurement error is plus and minus 1mm.

Description

technical field [0001] The invention belongs to an ultrasonic detection method, in particular to an ultrasonic creeping wave detection method of a dissimilar metal weld seam. Background technique [0002] Dissimilar metal welding is when the two metals being welded are of different types. Due to the different types of metal being welded, various defects may appear in the weld seam. The most typical defect is welding hot crack, that is, there are cracks in the weld, and the cracks appear singly or continuously. There is a small class of welding hot cracks called small opening cracks. Small opening cracks mean that the crack length is generally 2 to 3 mm, the defect height (crack longitudinal height) is less than 3 mm, the crack opening width is about 0.1 mm, and the defect depth (the distance between the crack and the weld seam) is less than 3 mm. The height of the surface) is generally within 3mm, and some are within 3-6mm. [0003] Since dissimilar metals after welding a...

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Application Information

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IPC IPC(8): G01B17/00
Inventor 于岗袁建中严智王庆武袁光华
Owner THIRD QINSHAN NUCLEAR POWER
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