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

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 ...

AI Technical Summary

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 and image three-dimensional reconstruction technology, and adopts new Nano-CT equipment to carry out non-destructive testing on welding components

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