Performance Comparison of Ultrasonic Focusing Techniques for Phased Array Ultrasonic Inspection of Dissimilar Metal Welds

Hwang, Young-In; Park, Jinhyun; Kim, Hak-Joon; Song, Sung‐Jin; Cho, Yong-Sang; Kang, Sung-Sik

doi:10.1007/s12541-019-00085-1

Cited by 15 publications

(8 citation statements)

References 16 publications

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“…1. Denim fibers and their microstructure Ultrasonic testing (Bhuiyan et al 2018), imaging (Boni et al 2018), and evaluations (Sarro and Ferreira 2019) have continuously contributed to academia (Tang et al 2019), industrial (Hwang et al 2019), and biomedical fields (Sigrist et al 2017). Ultrasound-based techniques provide information such as reflection intensity (Taheri and Hassan 2019) and speed of sound (Minh et al 2019) to estimate discontinuity imaging and elastic properties (Reese et al 2021).…”

Section: Denim Fibersmentioning

confidence: 99%

Fiberboard made from scrap denim: Characterization of its properties by effective bulk modulus elastography

Cui

Jin

Smith

et al. 2023

BioRes

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Fiberboards from scrap denim were fabricated using two different resins, melamine urea formaldehyde (MUF) and polymeric methylene diphenyl diisocyanate (pMDI). Resin content and MUF-pMDI weight ratio were studied. Physical and mechanical tests determined the modulus of elasticity (MOE), modulus of rupture (MOR), internal bond (IB), thickness swell (TS), and water absorption (WA). The resin content had significant impact on all properties. The MOE and IB were affected by the MUF-pMDI ratio. With 17 wt% more pMDI resin portion in the core layer of the denim boards, the IB for the denim fiberboard with a resin content of 15% was enhanced by 306%, while by 205% for the resin content of 25%. The increase in pMDI portion in the core layer of the boards improved both TS and WA of the scrap denim fiberboard. Effective bulk modulus elastography (EBME) was used to measure the acoustic reflection for the estimation of the strength properties of the denim fiberboard. The modulus results from EBME were correlated to the MOR, MOE, and IB of the denim fiberboard. A high correlation was found between the modulus from EBME and IB (R2 > 0.98). EBME can be a great technique to evaluate the bulk modulus distribution of the composites.

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Section: Denim Fibersmentioning

confidence: 99%

Fiberboard made from scrap denim: Characterization of its properties by effective bulk modulus elastography

Cui

Jin

Smith

et al. 2023

BioRes

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“…The most sensitive method is ultrasonic testing. The use of ultrasonic testing for dissimilar welded joints of reactor equipment is noted in several works [7,8].Essentially, testing is carried out using special equipment and techniques that take into account the design features of each welded joint [9,10]. However, the coarse-grained structure leads to a high attenuation of ultrasonic vibrations in the austenitic steels, and the complex structure of a dissimilar welded joint displays a high level of interference [11].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Structural State of Dissimilar Welded Joints by the Acoustic Emission Method

et al. 2022

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In this study, we investigated defect detection in dissimilar welded joints by the acoustic emission (AE) method. The study objects were carbide and decarburized interlayers, which are formed at the fusion boundary between austenitic and pearlitic steels. Diffusion interlayers, as a structural defect, usually have microscopic dimensions and cannot be detected using conventional non-destructive testing (NDT) methods. In this regard, the AE method is a promising approach to diagnose metal objects with a complex structure and to detect microscopic defects. In this paper, the AE signatures obtained from testing defect-free specimens and specimens with diffusion interlayers are analyzed. We found that the AE signature for defective and defect-free welded joints has significant differences, which makes it possible to identify descriptors corresponding to the presence of diffusion interlayers in dissimilar welded joints.

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“…The most widespread method of non-destructive testing of dissimilar welded joints is ultrasonic testing. In a number of papers the effective use of ultrasonic testing of dissimilar welded joints in power engineering equipment is shown [9][10][11], but it is noted that inspection of dissimilar welded joints, as a rule, is carried out due to the complication of the inspection procedure and the development of specialized methods that take into account the design features of each welded joint [12][13][14]. Moreover, when using nondestructive testing methods, diffusion interlayers create structural noises that interfere detection of defects such as cracks, pores, or lack of penetration, which makes dissimilar welded joints a difficult object for diagnostics.…”

Section: Introductionmentioning

confidence: 99%

Features of Acoustic Emission in Tensile Testing of Dissimilar Welded Joints of Pearlitic and Austenitic Steels

et al. 2021

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This paper presents a study of acoustic emission (AE) during the deformation of dissimilar welded joints of austenitic steel to pearlitic steel. One of the specific problems in these welded joints is the presence of decarburized and carbide diffusion interlayers, which intensively increase in width during long-term high-temperature operation. The presence of wide interlayers negatively affects the mechanical properties of welded joints. Moreover, welded defects are difficult to diagnose in welded joints containing interlayers: due to the high structural heterogeneity, interlayers create structural noises that can hinder the detection of defects such as cracks, pores, or a lack of penetration. The AE method may become a complex decision for diagnosing dissimilar welded joints due to applicability to the testing of heterogenic materials with a complex microstructure. Specimens cut from dissimilar welded joints of austenitic steel to pearlitic steel were tested by tension to rupture, with parallel AE data registration. According to the research results, the characteristic features of the AE were revealed for specimens containing defects in the form of lack of penetration as well as for specimens with diffusion interlayers. The results obtained show that the AE method can be used to test both typical welding defects and diffusion interlayers in welded joints of steels of different structural classes.

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Performance Comparison of Ultrasonic Focusing Techniques for Phased Array Ultrasonic Inspection of Dissimilar Metal Welds

Cited by 15 publications

References 16 publications

Fiberboard made from scrap denim: Characterization of its properties by effective bulk modulus elastography

Fiberboard made from scrap denim: Characterization of its properties by effective bulk modulus elastography

Assessment of the Structural State of Dissimilar Welded Joints by the Acoustic Emission Method

Features of Acoustic Emission in Tensile Testing of Dissimilar Welded Joints of Pearlitic and Austenitic Steels

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