Ultrasonic TOFD technology detection method for butt seam of different thickness plates

A butt weld and technical inspection technology, which is applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids and other directions, can solve problems such as the inability to detect thick plate weld parts, and achieve the effect of broadening the range

Active Publication Date: 2012-05-02
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0003] The purpose of the present invention is to provide an ultrasonic TOFD technology detection method for butt welds of unequal thickness plates. This method solves the problem that the existing TOFD technology cannot detect the weld parts of unequal thickness plates, and expands the TOFD technology. In order to achieve the purpose of expanding the detection range of TOFD technology

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  • Ultrasonic TOFD technology detection method for butt seam of different thickness plates
  • Ultrasonic TOFD technology detection method for butt seam of different thickness plates
  • Ultrasonic TOFD technology detection method for butt seam of different thickness plates

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Embodiment Construction

[0016] In conjunction with the content of the method of the present invention, the following numerical simulations and experimental tests are provided:

[0017] 1) Numerical simulation example

[0018] 1) Build as figure 1 The finite element model of the ladder-type test block shown is used for TOFD detection of welded joints of unequal thickness plates. The geometric parameters of the finite element model corresponding to the test block are shown in Table 1, and the material of the finite element model is steel. The diameter of the transverse through hole at the depth D=5mm from the surface of the thin plate at the butt joint is 1mm.

[0019] Table 1

[0020]

[0021] For this method, a stepped artificial defect test block is made, with a high plane thickness 20mm, bottom plane thickness is 10mm, and the defect depth is 5mm. Choose a probe with a longitudinal wave refraction angle of 60°, and the lengths S1 and S2 between the probe and the step are both 10mm. The r...

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Abstract

An ultrasonic TOFD technology detection method for butt seam of different thickness plates comprises the following steps of: Step 1, placing an emission probe on the upper plane of a thick plate of a butt seam of different thickness plates and placing a reception probe on the upper plane of a thin plate of the butt seam of different thickness plates; Step 2, determining the probe angle and the probe spacing by means of a method same with that described in the traditional TOFD method; Step 3, allowing the emission probe to firstly generate an incident longitudinal wave with a certain angle in the thick plate; Step 4, ending with bottom echo; and Step 5, calculating the defect depth. The technical effects of the invention are as follows: the novel TOFD technology is adopted to inspect the butt seam part of different thickness plates with a new near surface creeping wave replacing the traditional creeping wave disappeared in the plane so as to realize identification and positioning of defects and widen the range of TOFD inspection objects.

Description

technical field [0001] The invention relates to a detection method for butt joints of unequal thickness plates, in particular to an ultrasonic TOFD detection method for butt welds of unequal thickness plates. Background technique [0002] The time-of-flight diffraction method, also known as the TOFD method, is based on the interaction between ultrasonic waves and the end of the defect. The result of this interaction is that diffracted waves are emitted in a considerable range of angles. The detection of diffracted waves can determine the existence of defects and the depth and length of defects. In the specific detection process, the straight-through wave (that is, creeping wave near the surface) and the primary bottom echo are set as the detection range to ensure that the detection area completely covers the workpiece, which is suitable for the detection of flat welded workpieces with a certain thickness. However, for welded workpieces of unequal thickness, due to the struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07
Inventor 卢超王鑫陈振华
Owner NANCHANG HANGKONG UNIVERSITY
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