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Weld joint array far-field eddy current detection probe and detection method thereof

A far-field eddy current and detection probe technology, which is applied to measuring devices, instruments, and material analysis through electromagnetic means, can solve problems such as hidden safety hazards of aluminum alloy welding parts, and the inability to detect hidden defects inside welds, so as to improve sensitivity Effect

Pending Publication Date: 2020-11-03
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0003] In the prior art, the welding seam eddy current detection probe orthogonal to the detection coil and excitation coil is generally used to detect the weld seam of aluminum alloy welding parts. This kind of eddy current detection probe can effectively find the crack defect on the surface of the weld seam, but it cannot detect the inside of the weld seam The hidden defects of aluminum alloy welding parts still have great potential safety hazards

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  • Weld joint array far-field eddy current detection probe and detection method thereof
  • Weld joint array far-field eddy current detection probe and detection method thereof

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Embodiment Construction

[0023] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Several embodiments of the invention are shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0024] It should be noted that when an element is referred to as being “fixed on” another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only.

[0025] Unless otherwise def...

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Abstract

The invention provides a weld joint array far-field eddy current detection probe which at least comprises an excitation unit used for generating an excitation magnetic field, a detection unit used forpicking up eddy current field signals containing detected weld joint defect information in a far-field mode, and a shielding unit used for blocking a direct coupling electromagnetic field induced bythe excitation unit. The excitation unit comprises an excitation magnetizer and an excitation coil wound on the excitation magnetizer, the detection unit comprises a detection coil group perpendicularto the trend of the weld joint, and the shielding unit comprises a first shielding piece capable of accommodating the excitation unit and the detection unit. The invention further provides welding seam array far-field eddy current testing. According to the invention, a low-frequency electromagnetic field generated by the excitation coil can permeate into the weld joint and form an indirect coupling electromagnetic field in the weld joint, so that the detection coil group in a far field area can pick up an eddy current field signal containing defect information of the detected weld joint, andthe aim of detecting hidden defects in the weld joint is fulfilled.

Description

technical field [0001] The invention relates to the technical field of weld seam detection, in particular to a weld seam array far-field eddy current detection probe and a detection method thereof. Background technique [0002] The rail vehicle body is mainly composed of aluminum alloy welded parts. Since the service environment of the welded parts is harsh and the welds are prone to harmful defects, the inspection of the welded parts of the welded parts is very important. There is an eddy current testing technology, because it has the advantages of no couplant, fast detection speed, high sensitivity, in-service detection, etc., so the eddy current testing technology has been widely used in the weld detection of aluminum alloy welded parts. [0003] In the prior art, the welding seam eddy current detection probe orthogonal to the detection coil and excitation coil is generally used to detect the weld seam of aluminum alloy welding parts. This kind of eddy current detection p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90
CPCG01N27/904G01N27/9006
Inventor 宋凯欧阳永杰崔西明张丽攀
Owner NANCHANG HANGKONG UNIVERSITY
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