The eddy current inspection method: Part 3. Instrumentation and applications

Hansen, John

doi:10.1784/insi.46.7.414.55584

Cited by 2 publications

(5 citation statements)

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“…6, if a defect is introduced in the materialtested, eddy currents are disrupted. This defect reduces the eddy current which leads to decreasing the loading in the coil and changing the impedance of the system [10,11,12]. This system detects not only the cracks on the surface but also the discontinuities under the surface.As shown in Fig.…”

Section: Real-time Ndt Welded Areamentioning

confidence: 99%

“…7a) inside the material change the impedance (Fig. 7b) and the operator can distinguish the defects in the display by monitoring both the amplitude and phase [11]. Before inspection the operator needs to calibrate the eddy current machine by a test block.…”

Section: Real-time Ndt Welded Areamentioning

confidence: 99%

“…If it is parallel to the current path, the magnetic field and impedance will not be affected (Fig. 9) [10,11,14,15]. Fig.…”

Section: Real-time Ndt Welded Areamentioning

confidence: 99%

“…However, it is affected by different factors such as material composition,heat treatment, and work hardening. This may be described as the ease with which a material can be magnetized [11]. It is possible to adjust the frequency during inspection.…”

Section: Real-time Ndt Welded Areamentioning

confidence: 99%

“…It is possible to adjust the frequency during inspection. Depending on the material, lower frequencies are used for greater subsurface depths and higher frequenciesare used for the detection of flaws near the surface [10,11].…”

Section: Real-time Ndt Welded Areamentioning

confidence: 99%

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Real Time Non-Destructive Testing Methods of Welding

Kah

Mvola

Martikainen

et al. 2014

AMR

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This work presents a review of the three most efficient non-destructive testing methods. The methods are radiography, eddy current and ultrasonic inspection. These particular techniques were chosen because they are able to cover most of the industrial needs for welding joint inspection. The aim of this work is to present the physical background of operation for the given methods, discuss their benefits, limitations, and typical areas of application, and compare them with each other. In the first part of this work, all three methods and their variations are described in detail with schemes and figures which represent their working principles. It appears that, although all the given methods can detect all types of flaws in welded joints, they have their specific limitations. For example, ultrasonic testing is able to detect defects only in certain directions. The eddy current technique is also sensitive to defect direction, but it can be applied for inspecting conductive materials only. The main flaw of radiography is the resolution: it is not usable for very fine defects. The second part of the work is for comparing the testing methods and for drawing the conclusions. The methods are compared according to the possible materials, defect types and their position, as well as the possible areas of application. This part gives the background for choosing a proper welding joint testing method for certain applications in the welding industry.

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Section: Real-time Ndt Welded Areamentioning

confidence: 99%

Section: Real-time Ndt Welded Areamentioning

confidence: 99%

“…If it is parallel to the current path, the magnetic field and impedance will not be affected (Fig. 9) [10,11,14,15]. Fig.…”

Section: Real-time Ndt Welded Areamentioning

confidence: 99%

Section: Real-time Ndt Welded Areamentioning

confidence: 99%

Section: Real-time Ndt Welded Areamentioning

confidence: 99%