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Nondestructive testing method of three-dimensional shape and stress characteristics of internal defects of metal welding seam

A technology of internal defects and three-dimensional topography, applied in measurement devices, instruments, material analysis using radiation, etc., can solve problems such as inability to guarantee the accuracy of the model, infeasibility, etc., to save manpower, material resources and time, ensure accuracy, Guaranteed Integrity Effect

Active Publication Date: 2017-05-31
WENZHOU UNIVERSITY
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Problems solved by technology

In short, the above detection methods are infeasible or require more manual measurement operations and longer time consumption, and the accuracy of the model cannot be guaranteed

Method used

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  • Nondestructive testing method of three-dimensional shape and stress characteristics of internal defects of metal welding seam
  • Nondestructive testing method of three-dimensional shape and stress characteristics of internal defects of metal welding seam
  • Nondestructive testing method of three-dimensional shape and stress characteristics of internal defects of metal welding seam

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Embodiment Construction

[0018] A specific embodiment of the present invention is a method for detecting internal defects formed by dissimilar metal welds, especially for non-destructive testing of the three-dimensional shape and stress characteristics of the internal defects. The detection method is mainly composed of X-ray computed tomography scanner, dissimilar metal welding sample, VG Studio MAX software, and ansys software; the detector type of X-ray computed tomography scanner is Y.XRD 0820, and the number of detector units is 1024, the number of pixels is 1024×1024. The shape of the dissimilar metal welding sample is arbitrary, and generally it is a flat cuboid, and the size should not be too large, because the smaller the size, the higher the resolution of the three-dimensional reconstruction image. The analysis software used VG Studio MAX2.0 for data processing. The finite element analysis software uses hypermesh and ansys software for analysis and processing.

[0019] Next, an embodiment o...

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Abstract

The invention discloses a nondestructive testing method of a three-dimensional shape and stress characteristics of internal defects of a metal welding seam. According to the nondestructive testing method, with combination of an X-ray computed tomography scanning technology and a finite element analysis technology, the three-dimensional shape and the stress characteristics of the internal hole defects of the dissimilar metal welding seam can be tested under the condition without destroying a test piece. The method can also be used for obtaining space distribution, the hole size, the porosity, a pore-size distribution evolution law and the hole topological performance such as information including connectivity and tortuous degree of the internal hole defects of the dissimilar metal welding seam. The nondestructive testing method comprises the following steps: preparing a sample, scanning the test sample piece to acquire a scanned picture, recording a corresponding metal welding parameter, processing acquired scanned picture information, rebuilding a three-dimensional model, and testing and verifying the three-dimensional model by carrying out model mechanical analysis.

Description

technical field [0001] The invention belongs to the technical field of detection of dissimilar metal welding structures, and relates to a method for detecting internal defects formed by dissimilar metal welds, in particular to non-destructive detection of the three-dimensional appearance and stress characteristics of the internal defects. Background technique [0002] For metal welds, due to the welding process, various microscopic defects will inevitably occur in the metal welding area. Among them, microscopic holes are the main defect form in the welded structure, and these microscopic holes will cause stress concentration of the structure. Under the action of external load, the internal microscopic pores of the structure evolve continuously, which will eventually lead to the destruction of components and the overall structure. Both the volume and position distribution of microscopic pores are random, and their development process is a multi-scale damage evolution process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/18G01D21/02
CPCG01D21/02G01N23/18
Inventor 龙江启管倩倩黄文浩
Owner WENZHOU UNIVERSITY
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