Method of determining pipeline welding crack stress concentration using metal magnetic memory detection technology

A metal magnetic memory and stress concentration technology, applied in welding equipment, metal processing equipment, material magnetic variables, etc.

Inactive Publication Date: 2006-06-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no relevant literature report on the detection method of using the principle of metal magnetic memory to measure the internal stress concentration of welding cracks.

Method used

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  • Method of determining pipeline welding crack stress concentration using metal magnetic memory detection technology
  • Method of determining pipeline welding crack stress concentration using metal magnetic memory detection technology
  • Method of determining pipeline welding crack stress concentration using metal magnetic memory detection technology

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Embodiment Construction

[0031] The TSC-1M-4 metal magnetic memory detector is used to detect the welded joints of the X65 pipeline steel welded steel pipe on site. The geometric size of the steel pipe is Φ468×8mm. After nine welds containing welding cracks are detected, calculation is performed according to the calculation flow chart of the present invention, and the stress concentration value at the tip of each welding crack is obtained, as shown in Table 1. In order to compare with the calculated results, the stress concentration at the crack tip was measured by the small hole method, and the measured values ​​are shown in Table 1.

[0032] serial number

[0033] It can be seen from the data in the table that the error between the measured value and the calculated value is less than 15%, which shows that the non-destructive determination of the stress concentration at the tip of the welding crack by the present invention is accurate and reliable.

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Abstract

A method of using metal magnetic memory detection technique to confirm welding crack stress concentration of piping includes digitalizing magnetic memory signal obtained by metal magnetic memory detector and storing digital file in computer, confirming relation of pipe wall internal stress to self leakage magnetic field reacted by metal magnetic memory signal according to magnetic field Gauss theorem, defining maximum value of stress variation on welding crack pointed end as measuration of stress concentration degree on welding crack pointed end.

Description

technical field [0001] The invention relates to a method for determining the stress concentration of pipeline welding cracks by using metal magnetic memory detection technology, which belongs to the technology for determining the stress concentration at the tip of pipeline welding cracks. technical background [0002] Welding is an unbalanced process. The welded structure will inevitably produce welding residual stress, which will cause stress concentration in some local locations. Therefore, equipment and structures operating under high temperature, high pressure, and high load conditions are due to various stress concentrations. The damage caused by it is quite prominent. How to quantitatively measure the stress concentration of equipment and structures has always been a major concern of non-destructive testing. [0003] To measure the stress concentration of a certain part of the equipment and structure, the stress distribution of the part must ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/72B23K31/12G06F19/00
Inventor 李午申白世武邸新杰梁志芳刘方明
Owner TIANJIN UNIV
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