Results 151 to 160 of about 591 (186)

An alternative Ultrasonic Time of Flight Diffraction (TOFD) method

NDT and E International, 2018
Abstract In this work an alternative TOFD method is presented, capable to detect and size defects in the inspected material with good precision. It was shown that the diffraction used in this technique is the most relevant signal among the longitudinal backwall and the shear backwall echoes, compared to other TOFD methods.
T Clarke, Tadeusz Stepinski, T R Strohaecker   +2 more
exaly   +2 more sources

High-Frequency Filtering of Wedge Materials for TOFD

Materials Evaluation, 2023
This article addresses the question: What effects do different types of wedge materials have, if any, on frequency filtering in high-frequency time of flight diffraction scanning?
openaire   +1 more source

Analysis of Wave Propagation for the TOFD Method by Finite Element Method: Optimization of Test Configuration and Proposal of a New TOFD Method

AIP Conference Proceedings, 2006
Wave propagation in an austenitic stainless steel specimen with a slit open to the lower surface is modeled using finite element method, with consideration of the effects of scattering at grain boundaries. The distribution of energy of a diffracted longitudinal wave shows that this wave has the strongest energy directly above the slit. As a consequence
openaire   +1 more source

Mathematical morphology for TOFD image analysis and automatic crack detection

Ultrasonics, 2014
The aim of this work is to automate the interpretation of ultrasonic images during the non-destructive testing (NDT) technique called time-of-flight diffraction (TOFD) to aid in decision making. In this paper, the mathematical morphology approach is used to extract relevant pixels corresponding to the presence of a discontinuity, and a pattern ...
Thouraya, Merazi-Meksen, Malika, Boudraa, Bachir, Boudraa   +2 more
openaire   +2 more sources

The Use of TOFD for Enhancement of HDPE Pipe Fusion Inspection

Volume 4: Codes, Standards, Licensing and Regulatory Issues; Student Paper Competition, 2009
HDPE piping has been historically used in place of steels in petrochemical, power, and mining industries to mitigate corrosion and erosion issues. Additionally as HDPE pipe is resistant to Microbiologically Influenced Corrosion (MIC) and fouling, it appears to be a perfect fit for nuclear safety related cooling water applications. To this end, HDPE was
Clayton T. Smith, Peter den Boer, Lonnie Corley   +2 more
openaire   +1 more source

Applicability of Referent Blocks for TOFD Methods

1997
TOFD is to be applied for flaw sizing and characterization whenever it is possible, having essential advantage over conventional UT methods and accuracy much higher than the other UT methods. The primary application starting point is to demonstrate the capability of chosen UT system to be adjusted for TOFD in reproducible way.
Leljak, Irena, Krstelj, Vjera
openaire   +1 more source

The Realization of Portable Ultrasonic TOFD Imaging and Detecting System

Advanced Materials Research, 2013
This paper introduced the design of a portable ultrasonic TOFD imaging and detecting system, and developed the hardware and application software based on embedded system. We accomplished multi-channel ultrasonic transmission and acquisition, real time A-scan signal or TOFD image display, ultrasonic data storage and analysis of large capacity and ...
Si Yuan Wang, Xing Qun Zhao, Ling Xia
openaire   +1 more source

Analysis the Results of TOFD Inspection in Butt Joint Welds

Applied Mechanics and Materials, 2012
In the application of the TOFD inspection method, the analysis of test results is the focus and aporia of the study. TOFD image analysis include: analysis of defect size, location analysis and defect map features. In order to increase people's understanding of the TOFD technique, given butt joint welds TOFD and RT detect.
Peng Lin Zhang, Juan Dong, Li Cao
openaire   +1 more source

FEM Analyses of the TOFD Technique in Unequal Thickness Component

Applied Mechanics and Materials, 2014
The time-of-flight diffraction (TOFD) technique is a new ultrasonic nondestructive testing method. It utilize the longitudinal diffraction signal that generated from the defects, we can confirm whether there is a discontinuity in butt weld by the analysis of diffracted waves.
Xiang Dai, Chao Lu, Ming Fang Zheng
exaly   +2 more sources

L51815 The Development of a TOFD Image Reference Collection

1997
The Time Of Flight Diffraction (TOFD) Technique is rapidly gaining importance as a reliable NDT technique for weld inspection, capable of both detection and sizing of defects. The acquisition of TOFD inspection data is fast and straightforward; the crucial step in inspection reliability is therefore its interpretation. A reliable interpretation of TOFD
openaire   +1 more source