A Lamb wave contact type flaw detection method for a 2XXX type aluminum alloy sheet

A technology for aluminum alloys and thin plates, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, and measuring devices, etc. Defects and other problems to achieve the effect of meeting the quality requirements

Active Publication Date: 2018-11-30
NORTHEAST LIGHT ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem that the prior art cannot detect metallurgical defects such as structure inclusions and delaminations inside the aluminum alloy plate less than 6mm, the present invention proposes a Lamb wave contact flaw detection method for 2××× series aluminum alloy thin plates

Method used

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  • A Lamb wave contact type flaw detection method for a 2XXX type aluminum alloy sheet
  • A Lamb wave contact type flaw detection method for a 2XXX type aluminum alloy sheet

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specific Embodiment approach 1

[0027] Specific implementation mode one: combine figure 1 and figure 2 To illustrate this embodiment, the Lamb wave contact flaw detection method for 2××× series aluminum alloy thin plates in this embodiment is carried out according to the following steps:

[0028] 1. Probe selection:

[0029] Select two variable-angle ultrasonic probes, marked as probe No. 1 and probe No. 2;

[0030] 2. Make a comparison test block:

[0031] Select the 2××× alloy plate with a thickness of 3.0-4.0mm as the base material, and cut it into a sample with a length of 600-610mm and a width of 150-160mm. The longer side of the sample is perpendicular to the rolling direction. And after the shearing process, the shear surface of the sample is consistent with the flatness of the surface of the plate; the center of the circle is 50mm from the shorter side and 50mm from the longer side on the sample, and an artificial through hole with a diameter of 1mm is processed to obtain a comparison test block...

specific Embodiment approach 2

[0045]Embodiment 2: This embodiment differs from Embodiment 1 in that: the range of the angle of No. 1 probe in step 1 is 0° to 60°, the size of the piezoelectric chip is 10x8 mm, and the frequency of the piezoelectric chip is 5 MHz. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0046] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the range of the angle of No. 2 probe described in step 1 is 0-60°, the size of the piezoelectric chip is 5x13mm, and the frequency of the piezoelectric chip is 4MHz. . Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a flaw detection method for an aluminum alloy sheet, particularly a Lamb wave contact type flaw detection method for a 2XXX type aluminum alloy sheet. The method is provided to solve a problem that tissue inclusion, layering and other metallurgical flaws in aluminum alloy plates having a size less than 6 mm cannot be detected by the prior art. The method includes selectingtwo angle-variable ultrasonic wave probes, manufacturing a contrast test piece, determining reference sensitivity through a detection angle difference between the two angle-variable ultrasonic wave probes, setting the maximum scanning interval and a scanning path, setting a scanning speed, searching for flaw positions, determining flaw waves, and precisely determining flaw positions through comparison of oil waves with the flaw waves. Flaws of an aluminum alloy sheet having a size less than 6 mm can be accurately and reliably detected through the method, acoustic beams of the probes cover theoverall sheet in a scanning process to ensure no omission of flaws. The method is suitable for flaw detection of a 2XXX type aluminum alloy sheet.

Description

technical field [0001] The invention relates to a flaw detection method for an aluminum alloy thin plate. Background technique [0002] 2××× aluminum alloy sheet is an important material used in aviation and aerospace industries. With the rapid development of national defense and aviation technology, the requirements for its internal quality are becoming increasingly stringent. At present, one of the important means of detecting the internal structure of aluminum alloy sheets is ultrasonic testing technology. The current GB / T6519 "Ultrasonic Testing Method for Deformed Aluminum and Magnesium Alloy Products" and GJB1580A "Ultrasonic Testing Method for Deformed Metals" are mainly longitudinal wave and transverse wave. Detection, affected by the upper and lower blind areas, the thickness detection range is ≥6mm. The existing technology cannot detect metallurgical defects such as structure inclusions and delamination inside the aluminum alloy plate less than 6mm. Contents of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/24G01N29/30
CPCG01N29/043G01N29/2437G01N29/30G01N2291/0237G01N2291/0289G01N2291/106
Inventor 杨志刚郑磊王洪玉刘超张磊李德贵杜丽颖
Owner NORTHEAST LIGHT ALLOY CO LTD
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