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Corrected full-focus imaging method for anisotropy weld seam defect array detection

An anisotropy and imaging method technology, applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids and other directions, can solve problems such as weld seam anisotropy and non-uniformity, and achieve inaccurate and accurate defect positioning Effect

Active Publication Date: 2017-08-22
BEIJING UNIV OF TECH
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Problems solved by technology

However, they are all based on the commercial ultrasonic phased array system, so the anisotropy and non-uniformity of the weld are not considered

Method used

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  • Corrected full-focus imaging method for anisotropy weld seam defect array detection
  • Corrected full-focus imaging method for anisotropy weld seam defect array detection
  • Corrected full-focus imaging method for anisotropy weld seam defect array detection

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Embodiment 2

[0050] It is also possible to partition the weld model according to the grain orientation, that is, divide the weld into multi-layer grain orientation structures; see Figure 5 ; First calculate the time from the initial point excitation array element to the discrete point on the boundary of each layer; then calculate the time between the discrete point on the boundary line of the layer where the target point is located and the previous layer to the target point; since the incident direction of the wave is unknown , so the speed cannot be directly calculated. The propagation direction of the wave can be obtained according to the connection line between the discrete point on the boundary line of the layer where the target point is located and the previous layer and the target point, and the incident direction of the wave can be deduced according to the propagation direction of the wave; the incident direction of the wave and The group velocity can be calculated from the grain d...

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Abstract

The invention discloses a corrected full-focus imaging method for anisotropy weld seam defect array detection and belongs to the field of nondestructive testing. The method comprises the steps of processing full-matrix data received by a one-dimensional linear array sensor of a phased array, taking material anisotropy into consideration, calculating out group velocity of ultrasonic waves in an anisotropy medium, then utilizing a ray tracing algorithm based on a Fermat principle to calculate out propagation time of the ultrasonic waves in the anisotropy medium and finally achieving full-focus imaging of anisotropy weld seams. The method has the advantages that weld seam anisotropy is taken into consideration, the high-operation-efficiency ray tracing method based on the Fermat principle and the full-focus imaging method are combined, the problem that general full-focus imaging has inaccuracy in locating defects in the anisotropy medium is solved, and meanwhile, detection precision of the phased array in the anisotropy medium is improved.

Description

technical field [0001] The present invention relates to a corrected omni-focus imaging method for array detection of anisotropic weld defects, in particular to an ultrasonic array detection method suitable for defect positioning in anisotropic welds represented by austenitic stainless steel. Combining the ray tracing algorithm with the total focus imaging method to process the full matrix data collected by the phased array to realize the accurate positioning of the defects in the anisotropic weld belongs to the field of nondestructive testing. Background technique [0002] Austenitic stainless steel has the characteristics of excellent corrosion resistance, oxidation resistance and low temperature toughness, and is widely used in key parts of major basic industries such as petrochemical, machinery manufacturing and nuclear power, such as coolant pipes in nuclear power, spacecraft in fuselage, bulkheads and pressure vessels. In these large-scale equipment, the connection bet...

Claims

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Application Information

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IPC IPC(8): G01N29/06
Inventor 吴斌杨敬焦敬品何存富
Owner BEIJING UNIV OF TECH
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