Magnetic non-destructive testing method for thin-plate aluminum alloys

Hu, Bo; Yu, Runqiao; Zou, Hengcai

doi:10.1016/j.ndteint.2011.12.007

Cited by 41 publications

(10 citation statements)

References 9 publications

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“…The skin depth equation is given by, where μ is the permeability, σ is the conductivity and f is the frequency of excitation, and the penetration depth δ depends on excitation frequency f [8]. Because the Fourier transform of a pulse contains multiple frequency components [9,10], a rectangular pulse can provide the depth profile of a material under test [11]. The usage of short current pulse excitation reduces the power consumption, which is the most desired specification in the development of portable instruments.…”

Section: Introductionmentioning

confidence: 99%

Scanning the steel 08G2B using superminiature eddy current probe

et al. 2020

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The article describes a hardware and software complex designed for defectoscopy and study of material properties. Sections of high-strength steel 08G2B pipes were scanned in the course of the research. The purpose of this study is to determine dependency of eddy current sensor signal and mechanical and operational properties of the base metal (K65 steel grade) and demonstrate the ability of developed eddy current probe to detect continuity defects and corrosion in this type of metal. The steel is ultra-low-carbon, which makes it possible to study their properties using the eddy current method. The eddy current method is a non-contact one being used both for cracks identification and determination of their characteristics. A special superminiature eddy current probe was developed, which includes three coils - stabilizing, measuring and exciting. The coils were placed on a pyramid-shaped core made of alloy 81NMA. The eddy-current transducer runs under the control of the developed hardware-software complex with a system for suppression of noise and amplification of signal received from the eddycurrent transducer. Signal processing makes it possible to separate the effects of closely spaced cracks on the eddy-current transducer signal and evaluate the contribution of each crack separately. As a parameter containing information about the presence of defects in the object of control, the voltage arrived at the measuring coil of the eddy current probe signal was used. The work studied sections of pipes with model continuity defects – cracks and holes. A research that allows to simulate the presence of corrosion in the metal was also conducted. The extreme values of the eddy current probe signal over defects of different types are obtained at various velocity, that allows to identify the type of defect, while changing the frequency of the signal on the probe allows to determine the depth of the defect.

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Section: Introductionmentioning

confidence: 99%

Scanning the steel 08G2B using superminiature eddy current probe

et al. 2020

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“…Li et al [9] have reported on multiple nondestructive testing methods on the FSW of AA 2219-T6. Hu et al [10] also employed a high-precision magnetic sensor to detect the weld defects in aluminium Friction stir welds.…”

Section: Introductionmentioning

confidence: 99%

Scanning the welded joints of aluminium alloys using subminiature eddy-current transducers

et al. 2018

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Aluminium has a reputation for ease of use, strength and durability. In addition to its exceptional aesthetic properties, solid aluminium does not burn. As architects, contractors, consultants and real estate owners look to meet stringent safety requirements in the construction and refurbishment of high-rise constructions for both residential and commercial uses, aluminium cladding provides an alternative that is not only safe but that is also durable and attractive. One of the ways to connect elements into a aluminium construction is welding. friction stir welding is one of the most efficient. The authors developed a measuring system based on subminiaturized eddy-current transducers aimed at examining locally the defects of welded joints in aluminium-magnesium alloy plates connected by means of friction stir welding. The authors made a modification of the Delyann filter, which allowed them to increase considerably the signal-noise relations. The dependency of the eddy-current transducer response on defects was provided, i.e. concealed cuts and openings inside the welded joint, at the frequencies of 100-10000 Hz of the exciting winding.

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“…Hu et al [19] also used magnetic field sensors to study the welded joints obtained by FSW. They established that the magnetic permeability of such a welded seam changes significantly, which made it possible to use the eddy current method to find model defects having a size of the order of 13-130 mm.…”

Section: Introductionmentioning

confidence: 99%

Research on the welded seams of aluminum alloys using super-miniature eddy current transducers

2018

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Based on the eddy current transducer of the transformer type, a measuring system has been developed that makes it possible to investigate the welded joints obtained by friction stir welding (FSW). The main technical information about the eddy current converter being used is given, and a measurement procedure is described that allows to search for defects in welded seams of aluminum plates. The device allows to automatically change the main operating frequency of the device and the cutoff frequency of the filtration system. The experiments were carried out on aluminum-magnesium alloy plates being connected by friction welding. In the article, the results of measurements are presented, allowing to estimate the quality of a welded seam and to answer a question on reliability of welding.

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Magnetic non-destructive testing method for thin-plate aluminum alloys

Cited by 41 publications

References 9 publications

Scanning the steel 08G2B using superminiature eddy current probe

Scanning the steel 08G2B using superminiature eddy current probe

Scanning the welded joints of aluminium alloys using subminiature eddy-current transducers

Research on the welded seams of aluminum alloys using super-miniature eddy current transducers

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