Detection and Sizing of Fatigue Cracks in Steel Welds With Advanced Eddy Current Techniques

Todorov, Evgueni; Mohr, William; Lozev, Mark

doi:10.1063/1.2902549

Cited by 7 publications

(3 citation statements)

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“…The eddy current method applied in [26,27] enables non-contact measurement of surface cracks even below paint coatings. Thereby, eddy currents proportional to the conductivity of the material are induced by placing an AC-energized probe coil near the surface of the specimen.…”

Section: Detection Of the Crack Initiation Pointmentioning

confidence: 99%

Crack Initiation and Propagation Fatigue Life of Ultra High-Strength Steel Butt Joints

et al. 2019

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The division of the total fatigue life into different stages such as crack initiation and propagation is an important issue in regard to an improved fatigue assessment especially for high-strength welded joints. The transition between these stages is fluent, whereas the threshold between the two phases is referred to as technical crack initiation. This work presents a procedure to track crack initiation and propagation during fatigue tests of ultra high-strength steel welded joints. The method utilizes digital image correlation to calculate a distortion field of the specimens’ surface enabling the identification and measurement of cracks along the weld toe arising during the fatigue test. Hence, technical crack initiation of each specimen can be derived. An evaluation for ten ultra high-strength steel butt joints reveals, that for this superior strength steel grade more than 50% of fatigue life is spent up to a crack depth of 0.5 mm, which can be defined as initial crack. Furthermore, a notch-stress based fatigue assessment of these specimens considering the actual weld topography and crack initiation and propagation phase is performed. The results point out that two phase models considering both phases enable an increased accuracy of service life assessment.

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Section: Detection Of the Crack Initiation Pointmentioning

confidence: 99%

Crack Initiation and Propagation Fatigue Life of Ultra High-Strength Steel Butt Joints

et al. 2019

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“…Todorov, et al conducted a study to demonstrate the capabilities of advanced EC techniques for detection and sizing of fatigue cracks in welds. [63] Butt weld specimens were first fabricated and prepared to initiate and grow fatigue cracks at the weld toe. The specimens were raster scanned with a single EC sensor to produce a C-scan (and/or Isometric view) for imaging, detection, and sizing of fatigue cracks.…”

Section: Noncontact Testing For Discontinuities With Etmentioning

confidence: 99%

America Makes: National Additive Manufacturing Innovation Institute (NAMII) Project 1: Nondestructive Evaluation (NDE) of Complex Metallic Additive Manufactured (AM) Structures

Todorov¹,

Spencer²,

Gleeson³

et al. 2014

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“…Advanced automated eddy current techniques with single and array sensors have proven very effective for detection, imaging, and quantification of discontinuities and surface treatments [3][4][5][6][7]. For example, reliable detection and sizing of very tight fatigue cracks in weld toe area with the weld crown in place and with the crown machined flush was realized in a study investigating advanced eddy current techniques for weld inspection [3]. The array sensors will allow simultaneous scanning of entire weld surface at several frequencies for detection and sizing of surface and slightly subsurface flaws.…”

Section: Introductionmentioning

confidence: 99%

Inspection of laser welds with array eddy current technique

Todorov

Nagy

Levesque

et al. 2013

AIP Conference Proceedings

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Three groups of laser weld specimens made of steel 316L for nuclear applications were fabricated -acceptable, missed seam (MS) and lack of penetration (LOP). An array eddy current technique was developed and investigated. The specimens top and bottom surfaces were scanned parallel and transverse to the weld line. The MS and LOP were easily imaged, detected and sized. Additional flaw indications were found in visually acceptable weld areas. Limited weld destructive testing was performed validating characteristic eddy current flaw indications.

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Detection and Sizing of Fatigue Cracks in Steel Welds With Advanced Eddy Current Techniques

Cited by 7 publications

References 0 publications

Crack Initiation and Propagation Fatigue Life of Ultra High-Strength Steel Butt Joints

Crack Initiation and Propagation Fatigue Life of Ultra High-Strength Steel Butt Joints

America Makes: National Additive Manufacturing Innovation Institute (NAMII) Project 1: Nondestructive Evaluation (NDE) of Complex Metallic Additive Manufactured (AM) Structures

Inspection of laser welds with array eddy current technique

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