Coherence Weighting Applied to FMC/TFM Data from Austenitic CRA Clad Lined Pipes

Baiotto, Ricardo; Knight-Gregson, Benjamin; Nageswaran, Channa; Clarke, Thomas Gabriel Rosauro

doi:10.1007/s10921-018-0498-9

Cited by 7 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared to other data acquisition methods, FMC data contains more information and demonstrates potential for solving various issues. In contrast to conventional ultrasonic phased array detection, the total focusing method (TFM), based on FMC, can achieve focalization at any selected point within the measurement area by post-processing the full matrix data acquired from the transducer array [11,12].…”

Section: Introductionmentioning

confidence: 99%

Multi-layered medium ultrasonic phased array sparse TFM imaging based on self-adaptive differential evolution algorithm

Yao,

Zhao,

et al. 2024

Meas. Sci. Technol.

View full text Add to dashboard Cite

Multilayer Composite material structures have been widely used in modern engineering fields. However, defects within these materials can adversely affect mechanical properties. Ultrasonic phased array Total Focusing Method (TFM) imaging has advantages of high precision and dynamic focusing over the entire range, achieving significant progress in homogeneous medium detection. However, heavy computational burdens of multilayer structures lead to inefficient imaging. To address this issue, a sparse-TFM imaging algorithm using ultrasonic phased arrays suitable for multilayer media is proposed in this paper. This method constructs a fitness function with constraints such as main lobe width and sidelobe peak. Its objective is to obtain the distribution of sparse array element positions using an Self-adaptive differential evolution algorithm(SaDE). Subsequently, the delay time of each array element in multilayer media sparse TFM is calculated using the Root Mean Square (RMS) principle and combined with amplitude weighting, the method corrects the imaging results. Compared with the Ray-based full-matrix capture and total focusing method method (Ray-based FMC/TFM), the root mean square-based full-matrix capture and total focusing method (RMS-based FMC/TFM), and the phase shift method (PSM), the experimental and simulation results demonstrate that the proposed method significantly reduces the imaging data volume, improves computational efficiency, and maintains quantitative errors within 0.2 mm.

show abstract

Section: Introductionmentioning

confidence: 99%

Multi-layered medium ultrasonic phased array sparse TFM imaging based on self-adaptive differential evolution algorithm

Yao,

Zhao,

et al. 2024

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Weld overlay is a fusion-based welding process for depositing coats, allowing manufacturing clad pipes with various thicknesses, diameters, and lengths [8]. Besides, weld overlay is employed to seal the liner at the pipe ends and joint preparation of lined pipes [9,10]. TIG hotwire is often used for cladding critical parts of subsea equipment because it presents high efficiency, low heat input, and high quality [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Investigating an API X65 steel pipe cladded with alloy 625

Knerek¹,

Lemos²,

Voort³

et al. 2021

Tecnol. Metal. Mater. Min.

View full text Add to dashboard Cite

Pipes (rigid risers and flowlines) are employed to transport oil and gas from the wells to the platforms. In these pipes, the fluids can be very corrosive and, therefore, corrosion-resistant alloys (CRA) must be chosen. Alloy 625 is a well-known CRA with improved corrosion resistance. However, nickel-based alloys have high cost compared to that of the low alloy steels, thus pipes entirely made of CRA are economically unfeasible. Internal coating with a thin CRA layer is a less expensive and suitable alternative than the solid CRA. An internal coating by overlay manufacturing process can induce phase transformations at the interface. In this work, an alloy 625 cladding layer was deposited in an API X65 steel substrate with an automatic weld overlay system using gas tungsten arc welding (GTAW) process (often referred to as tungsten inert gas (TIG) hotwire). Thus, this study aims at evaluating an API X65 steel pipe cladded with alloy 625. The results show a suitable nickel-based alloy overlay deposited in an API X65 carbon steel substrate.

show abstract

“…However, its use in field applications has drawbacks, such as mounting equipment in the correct defect-tofilm and source-to-specimen distances [12]. There is also a considerable risk to personnel and environment due to the ionising radiation produced [1,7,13].…”

Section: Introductionmentioning

confidence: 99%

“…Conventional ultrasonic testing (UT) and phased array ultrasonic testing (PAUT) methods have also been developed [11,14]. Nevertheless, these methods have not fully succeeded due to the interaction of the acoustic beam with the complex and anisotropic microstructure formed in the fusion weld, which causes reflections and beam skewing [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Medium Range Guided Wave Inspection of the Triple Point in Lined Pipes by EMATs

Dias¹,

Nageswaran

Jacques³

et al. 2019

J Nondestruct Eval

Self Cite

View full text Add to dashboard Cite

The advent of mechanically lined pipes represented a new turning point for the oil industry in terms of performance and cost for fluids transportation. However, the implementation of this technology demanded the development of new improvements such as reel-lay techniques and joining methods to ensure the reliable and safe operation of the pipeline. It also posed new challenges for inspection and flaw assessment by non-destructive testing (NDT) methods, especially of the joining region formed at the pipe termination by the interface between liner, steel substrate and the weld overlay used for sealing of the assembly. This region, commonly referred to as the triple point, is formed by a dissimilar weld joint with high metallurgical complexity. As a consequence, many conventional NDT techniques have failed in providing trustworthy indications of the defects. Thus, in order to find an alternative for NDT inspection to fulfil the international security standards, this paper reports the use of guided waves generated by an electromagnetic acoustic transducer (EMAT) to interrogate the integrity of the triple point. The present research focused on the performance evaluation of shear horizontal waves to interrogate a test piece simulating a lined pipe structure which had artificially inserted discontinuities at the triple point region. The findings documented in this paper were achieved by the means of finite element analysis (FEA) and experimental validation of a transducer design and wave propagation in the triple point area.

show abstract

Coherence Weighting Applied to FMC/TFM Data from Austenitic CRA Clad Lined Pipes

Cited by 7 publications

References 23 publications

Multi-layered medium ultrasonic phased array sparse TFM imaging based on self-adaptive differential evolution algorithm

Multi-layered medium ultrasonic phased array sparse TFM imaging based on self-adaptive differential evolution algorithm

Investigating an API X65 steel pipe cladded with alloy 625

Medium Range Guided Wave Inspection of the Triple Point in Lined Pipes by EMATs

Contact Info

Product

Resources

About