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Method for detecting welding seam on basis of quantum dot infrared fluorescence display technology

A technology of infrared fluorescence and display technology, which is applied in the field of non-destructive detection of nano-scale metal welds, and can solve the problems of cumbersome detection process and low detection accuracy

Inactive Publication Date: 2013-11-06
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Description
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of low detection accuracy and cumbersome detection process in the prior art, and provide a new welding seam detection method based on quantum dot infrared fluorescence display technology

Method used

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  • Method for detecting welding seam on basis of quantum dot infrared fluorescence display technology
  • Method for detecting welding seam on basis of quantum dot infrared fluorescence display technology
  • Method for detecting welding seam on basis of quantum dot infrared fluorescence display technology

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Embodiment

[0040] Embodiment: Man-made scratches between 5 μm and 100 μm in the metal surface,

[0041] From step (1), preliminary cleaning is carried out on the metal surface. From step (2), the colloid immobilized with the quantum dot material is coated on the metal welding surface to be tested, so that the colloid penetrant can fully penetrate. Here, quantum dots with a line size of 5nm are used. From step (3), after standing for a few minutes, until the colloid is basically fixed, clean the metal surface penetrant residue containing scratches with acetone. From step (4), turn on the power of the infrared laser and let the laser pass through figure 2 The middle beam expander 22 expands the beam output by the infrared laser to a width of 6 cm. The expanded beam laser scans the metal plate along a fixed direction to realize the development of infrared fluorescence. Real-time infrared fluorescence capture is carried out through the detector, and the image of infrared fluorescence is ...

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Abstract

The invention relates to a method for detecting a welding seam on the basis of a quantum dot infrared fluorescence display technology. The detection process comprises the following steps of: carrying out primary cleaning on the surface of a welding zone; adding a quantum dot infrared fluorescence material; carrying out infrared laser scanning; acquiring a defect image by a detector; and recording and analyzing defects. The semiconductor quantum dot infrared fluorescence material is applied to carry out defect marking on the welding zone; beam-expanded laser emitted by an infrared laser with the corresponding wavelength is used for carrying out scanning on the welding seam so as to realize infrared excitation of the fluorescence material at the defect position; and then the recording of an implementing image is carried out by the detector. The image can be subjected to post processing to obtain more detailed information of the welding seam and the defect distribution condition of the welding zone is analyzed and forecasted. The method can be used for realizing the detection of the micro welding seam by utilizing the advantages of the linearity of quantum dots at the nano scale, has high detection accuracy and simple process, is used for detecting the defects of the welding seam on the premise of not damaging the welding seam and belongs to the category of the nondestructive testing. According to the method disclosed by the invention, the high precision detection standard can be met and the potential fault of the welding seam can be forecasted.

Description

technical field [0001] The invention belongs to the technical field of non-destructive detection of metal welds, relates to a detection process using semiconductor quantum dot infrared fluorescence display, in particular to a method capable of non-destructive detection of nanoscale metal welds. Background technique [0002] In many aspects of construction, such as railway bridge construction, urban building construction, petrochemical industry, etc., a large number of metal pipes and metal steel plates will be involved in the laying work. Most of the connections between pipes or other metals are constructed by welding methods. However, in order to ensure the engineering quality of metal welding, evaluation and non-destructive testing of welding results are required. [0003] There are mainly three kinds of welding quality detection methods at present: in the welding process, by monitoring various optical electromagnetic signals and welding conditions that occur during weldin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/91G01N21/64
CPCG01N21/91G01N2021/646
Inventor 魏臻王茂榕邢志广赵思宁赵彩敏苌浩姜啸宇钟声
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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