Defect Detection in Thick Weld Structure Using Welding In-Process Laser Ultrasonic Testing System

Yamamoto, Setsu; Hoshi, Takeshi; Miura, Takahiro; Semboshi, Jun; Ochiai, Makoto; Fujita, Yoshihiro; Ogawa, Tomoko; Asai, Satoru

doi:10.2320/matertrans.i-m2014809

Cited by 40 publications

(12 citation statements)

References 14 publications

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“…Note that an LDV has a broad reception bandwidth, enabling the use of an arbitrary frequency range in the same system simply by changing the piezoelectric transmitter. Furthermore, in contrast to laser ultrasonics 40 – 42 using lasers for both emission and reception, a large-amplitude ultrasonic incidence with a piezoelectric transmitter can compensate for the low SNR of the LDV due to the small laser irradation spot. This enables high-SNR imaging, which is essential for research and industrial applications.…”

Section: Methodsmentioning

confidence: 99%

Exploring 3D elastic-wave scattering at interfaces using high-resolution phased-array system

Ohara

Remillieux

Ulrich

et al. 2022

Sci Rep

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The elastic-wave scattering at interfaces, such as cracks, is essential for nondestructive inspections, and hence, understanding the phenomenon is crucial. However, the elastic-wave scattering at cracks is very complex in three dimensions since microscopic asperities of crack faces can be multiple scattering sources. We propose a method for exploring 3D elastic-wave scattering based on our previously developed high-resolution 3D phased-array system, the piezoelectric and laser ultrasonic system (PLUS). We describe the principle of PLUS, which combines a piezoelectric transmitter and a 2D mechanical scan of a laser Doppler vibrometer, enabling us to resolve a crack into a collection of scattring sources. Subsequently, we show how the 3D elastic-wave scattering in the vicinity of each response can be extracted. Here, we experimentally applied PLUS to a fatigue-crack specimen. We found that diverse 3D elastic-wave scattering occurred in a manner depending on the responses within the fatigue crack. This is significant because access to such information will be useful for optimizing inspection conditions, designing ultrasonic measurement systems, and characterizing cracks. More importantly, the described methodology is very general and can be applied to not only metals but also other materials such as composites, concrete, and rocks, leading to progress in many fields.

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Section: Methodsmentioning

confidence: 99%

Exploring 3D elastic-wave scattering at interfaces using high-resolution phased-array system

Ohara

Remillieux

Ulrich

et al. 2022

Sci Rep

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“…Ultrasonic testing [6] is based on the different propagation of soundwaves in different materials and is often used in weld control (e.g. [18,29,15,2]). However, ultrasonic testing usually incorporates a coupling medium or direct contact to the sample.…”

Section: Non-destructive Weld Testingmentioning

confidence: 99%

How To Develop a NDT Method For Weld Inspection in Battery Cell Manufacturing Using Deep Learning

Rohkohl¹,

Kraken²,

Schönemann³

et al. 2021

Preprint

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Battery cells are central components of electric vehicles. It is important for automotive OEM to utilize high quality battery cells to ensure high performance and safety of their vehicles. This results in the high demand for quality control measures and inspection methods in battery cell manufacturing. Particular relevant features of battery cells are welds for the internal electrical contact. Failures of these welds are often the cause for battery defects in the field and scrap during production. Consequently, there is a strong need to evaluate all welds during manufacturing. However, there is no established method which allows a quick, comprehensive, and cheap inline measurement of the weld quality. This paper presents a new eddy current based method for non-destructive testing of seam welds as well as a machine learning approach for its validation. A deep learning model has been trained on eddy current measurements to predict results from a reference inspection method, in this case computer tomography. The results prove that eddy current measurements can be used to replicate data acquired by computer tomography which means that eddy current measurements could be a suitable candidate for non-destructive 100% inline inspection. More general, this study demonstrates how machine learning may help to get deeper insights into measurement results and to validate new non-destructive testing techniques whose detailed features are yet unknown. The presented evaluation method enables understanding the capabilities and the limits of a new technique and to extract hidden features from the data. Furthermore, the usage of machine learning allows to perform these evaluations on artificial product samples with specific defects and features, which avoids the costly production physical samples.

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“…Setsu et al [4] developed a surface inspection technique by using the laser-generated surface acoustic waves and a modified signal processing technique named as m-SAFT. The technique was applied to detect and measure cracks in a 150-mm-thickness welded area over a 200°C target.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis on the propagation characteristics of laser-generated surface acoustic wave in V-groove weld

2023

J. Phys.: Conf. Ser.

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Thick-walled structures, such as marine engineering and rail transportation, are widely used in modern society. V-groove welding is a common welding method in thick structures. At the same time, the V-groove weld is also the area of a thick-walled structure in which defects are most easily formed. Laser-generated surface acoustic waves are a promising non-destructive testing method in most fields. This study examined the propagation characteristics of laser-generated surface acoustic waves in a V-groove weld. A two-dimensional finite element model with Q345 steel was constructed. A thermoelastic mechanism was adopted to generate the wave. The temperature and displacement fields were analyzed in detail. The results showed that wave transmission, reflection, and mode conversion are generated with an R wave at the junction, and the dispersion phenomenon of the R wave occurred in the welded area.

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Defect Detection in Thick Weld Structure Using Welding In-Process Laser Ultrasonic Testing System

Cited by 40 publications

References 14 publications

Exploring 3D elastic-wave scattering at interfaces using high-resolution phased-array system

Exploring 3D elastic-wave scattering at interfaces using high-resolution phased-array system

How To Develop a NDT Method For Weld Inspection in Battery Cell Manufacturing Using Deep Learning

Finite element analysis on the propagation characteristics of laser-generated surface acoustic wave in V-groove weld

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