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Internal eddy current inspection

A technology of eddy current flaw detection and eddy current probe, which is applied in the field of non-destructive inspection and can solve problems such as inaccessibility

Active Publication Date: 2010-06-16
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The outer surfaces of the dovetail lobes are easily inspected with conventional eddy current measuring instruments, however the internal passages in the dovetail are relatively small and effectively hide their surfaces from easy access

Method used

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  • Internal eddy current inspection
  • Internal eddy current inspection
  • Internal eddy current inspection

Examples

Experimental program
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Embodiment Construction

[0020] exist figure 1 An eddy current inspection apparatus 10 specifically configured for eddy current inspection of a sample 12 having one or more accessible internal passages or channels 14 is shown in FIG. Samples may be of any construction and material composition amenable to eddy current testing. For example, the representative sample shown is a first stage turbine rotor blade for an aircraft gas turbine engine.

[0021] The blade sample 12 comprises a hollow airfoil with rows of film cooling holes for venting cooling air during operation. The airfoil is integrally formed in conventional casting with a conventional multi-lobed dovetail slot at its root end through which three representative internal passages 14 extend into the airfoil to provide the airfoil during operation. Provide coolant.

[0022] As mentioned above, during operation in the hot gas environment of the turbine at higher temperatures, rotor components of the turbine, such as representative blade sample...

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Abstract

An eddy current inspection apparatus (10) includes a holder (16) for a specimen (12), a holder (22) for an eddy current probe (20), and an eddy current instrument (32) operatively joined thereto. Theprobe holder (22) includes carriages (24,26) for translating the probe (20) along first and second axes. The probe holder (22) is selectively moved to align the probe (20) with an internal channel (14) of the specimen (12) for sliding movement therealong to conduct eddy current inspection thereof.

Description

technical field [0001] The present invention relates generally to non-destructive testing, and more particularly to eddy current testing of manufactured components. Background technique [0002] A gas turbine engine includes a shaft and disks that support the rotating blades in the fan, compressor, high-pressure turbine, and low-pressure turbine. Commercial and military turbine engines used to power aircraft in flight require the lowest possible weight while maintaining a reasonable service life for engine components. [0003] Rotating components are subjected to considerable centrifugal loads during operation which generate corresponding stresses which must be limited in order to increase the life of the components. Various forms of superalloy materials are commonly used in modern aircraft turbine engines in order to ensure the integrity of the component over its service life. [0004] However, defects, cracks or other abnormalities may exist in the material during the or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/90
CPCG01N27/902
Inventor M·W·费尔德斯M·L·齐克J·R·迪尔多夫A·W·梅洛尔斯J·M·约翰逊
Owner GENERAL ELECTRIC CO