New non-destructive detection method for morphology and distribution of pores in welding seam

A technology of non-destructive testing and new method, applied in the direction of using radiation for material analysis, etc., to achieve the effect of wide detection range and reduced sensitivity

Inactive Publication Date: 2013-08-07
SHANGHAI JIAO TONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The invention aims at the porosity problem that is very easy to occur when laser welding metal materials, combines X-ray scanning technology...

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  • New non-destructive detection method for morphology and distribution of pores in welding seam
  • New non-destructive detection method for morphology and distribution of pores in welding seam
  • New non-destructive detection method for morphology and distribution of pores in welding seam

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Embodiment 1

[0033] In this embodiment, the schematic diagram of the process of the detection method can be found in figure 1, here the laser welded low-carbon steel T-joint workpiece is selected for detection, because during the laser deep penetration welding process, due to the instability of the small holes, macroscopic pores are particularly easy to produce, so there are many pores in the selected welded components, and the detection and observation results Obviously, it is more conducive to testing the reliability of the method.

[0034] (1) First cut out the T-shaped weldment of appropriate size, and grind its surface with coarse sandpaper to remove surface splashes, inclusions and other attachments and impurities to make the surface smooth, and then use ultrasonic cleaning for 8 minutes to completely remove surface impurities; Wherein, the time of ultrasonic cleaning can be selected at any time within 5-10 minutes, and the above-mentioned 8 minutes is only an example;

[0035] (2) ...

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Abstract

The present invention discloses a new non-destructive detection method for morphology and distribution of pores in welding seam. According to the method, a novel Nano-CT tomography system is adopted to detect a weldment, an X-ray source is adopted to carry out 360 DEG scanning on the welding component, a certain degree of attenuation can be generated when X rays penetrate through the weldment, energy attenuation of the X rays passing through the pores in a welding seam can be significantly lower than energy attenuation of the surrounding rays, a flat panel detector is adopted to receive transmission energies of different degrees of the attenuations so as to obtain multiple groups of tomography scanning images, and three-dimensional reconstruction is performed on the multiple groups of the tomography data to obtain a three-dimensional detection image of pore defect in the welding seam. The detection method has the following characteristics that: resolution is high, imaging is intuitive, the method is not affected by a weldment material type, a shape, a structure and other factors, important information such as a three-dimensional morphology, a pore size, a spatial distribution characteristic and the like of the pores in the welding seam can be obtained, and important significance is provided for pore classification, defect assessment and other aspects, wherein the important information such as a three-dimensional morphology, a pore size, a spatial distribution characteristic and the like is difficult obtained by using the conventional method.

Description

technical field [0001] The invention relates to the field of non-destructive testing of welding defects, in particular to a new non-destructive testing method for the shape and distribution of pores in welds. Background technique [0002] Welded components are widely used in modern science and technology and production. With the development of boilers, pressure vessels, ships, automobiles, aerospace vehicles, and nuclear power facilities to high parameters and large-scale development, the working conditions of welded components are becoming increasingly harsh and complex. , which puts forward higher requirements on the quality of welded components. In order to be able to find extremely small welding defects in welded components for repair, thereby improving the safe operation and reliability of welded components, it is necessary to adopt and develop advanced and high-precision welding defect inspection technology. [0003] Welding porosity is one of the very common welding ...

Claims

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Application Information

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IPC IPC(8): G01N23/18
Inventor 芦凤桂李希彬唐新华崔海超吴毅雄
Owner SHANGHAI JIAO TONG UNIV
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