The Experts below are selected from a list of 27 Experts worldwide ranked by ideXlab platform
Jerry James - One of the best experts on this subject based on the ideXlab platform.
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rail weld inspection using Phased Array Ultrasonics
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: VOLUME 32, 2013Co-Authors: Girish N Namboodiri, Krishnan Balasubramaniam, T Balasubramanian, Jerry JamesAbstract:Inspection of rail welds has always been a challenge to the Railways. The conventional ultrasonic methods which are employed now for the detection of defects are not found to be good enough for defects that exist in different parts of the weld. Phased Array Ultrasonics which performs sectorial scanning could be used effectively for detection of defects in rail welds. The analysis of Phased Array images basically concentrates on defects that are volumetric in rail. The feasibility studies conducted in parts of rail other than welds were promising. Defect indications were seen very much separately from its surroundings. Accurate positioning of the defect is possible. Close lying defects can be seen separately which assures better resolution. Linear normal scans were very much suitable to detect cracks of complex geometries, as it gives a specific indication pattern each time when it is present.
Girish N Namboodiri - One of the best experts on this subject based on the ideXlab platform.
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rail weld inspection using Phased Array Ultrasonics
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: VOLUME 32, 2013Co-Authors: Girish N Namboodiri, Krishnan Balasubramaniam, T Balasubramanian, Jerry JamesAbstract:Inspection of rail welds has always been a challenge to the Railways. The conventional ultrasonic methods which are employed now for the detection of defects are not found to be good enough for defects that exist in different parts of the weld. Phased Array Ultrasonics which performs sectorial scanning could be used effectively for detection of defects in rail welds. The analysis of Phased Array images basically concentrates on defects that are volumetric in rail. The feasibility studies conducted in parts of rail other than welds were promising. Defect indications were seen very much separately from its surroundings. Accurate positioning of the defect is possible. Close lying defects can be seen separately which assures better resolution. Linear normal scans were very much suitable to detect cracks of complex geometries, as it gives a specific indication pattern each time when it is present.
B B Grimmett - One of the best experts on this subject based on the ideXlab platform.
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testing superaustenitic stainless steel welds using Phased Array Ultrasonics
Materials evaluation, 2004Co-Authors: M G Lozev, E B Shell, R L Spencer, B B GrimmettAbstract:An emerging technology, Phased Array ultrasonic testing, has been used with promising success to detect and size discontinuities in difficult to test superaustenitic stainless steel welds. The approach utilizes a dual transmitter/receiver longitudinal wave Phased Array probe to minimize the effects of beam skew and velocity variations in the weld metal. Electronic steering, using Phased Array principles to obtain sectorial scans, ensures complete weld volume testing, even in the presence of unpredictable beam skew. The dual probe minimizes noise due to the coarse grained structure. Discontinuities in the austenitic weld metal were easily detected using a dual Phased Array ultrasonic probe. Ultrasonic measurements of the size (height) of the discontinuities were reasonable, with accuracies around ±1 to 2 mm (0.04 to 0.08 in.). The use of a dual Phased Array probe was a great improvement over a single Phased Array probe, as it reduced noise reflections and allowed easier interpretation of the scan results.
Krishnan Balasubramaniam - One of the best experts on this subject based on the ideXlab platform.
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rail weld inspection using Phased Array Ultrasonics
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: VOLUME 32, 2013Co-Authors: Girish N Namboodiri, Krishnan Balasubramaniam, T Balasubramanian, Jerry JamesAbstract:Inspection of rail welds has always been a challenge to the Railways. The conventional ultrasonic methods which are employed now for the detection of defects are not found to be good enough for defects that exist in different parts of the weld. Phased Array Ultrasonics which performs sectorial scanning could be used effectively for detection of defects in rail welds. The analysis of Phased Array images basically concentrates on defects that are volumetric in rail. The feasibility studies conducted in parts of rail other than welds were promising. Defect indications were seen very much separately from its surroundings. Accurate positioning of the defect is possible. Close lying defects can be seen separately which assures better resolution. Linear normal scans were very much suitable to detect cracks of complex geometries, as it gives a specific indication pattern each time when it is present.
T Balasubramanian - One of the best experts on this subject based on the ideXlab platform.
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rail weld inspection using Phased Array Ultrasonics
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: VOLUME 32, 2013Co-Authors: Girish N Namboodiri, Krishnan Balasubramaniam, T Balasubramanian, Jerry JamesAbstract:Inspection of rail welds has always been a challenge to the Railways. The conventional ultrasonic methods which are employed now for the detection of defects are not found to be good enough for defects that exist in different parts of the weld. Phased Array Ultrasonics which performs sectorial scanning could be used effectively for detection of defects in rail welds. The analysis of Phased Array images basically concentrates on defects that are volumetric in rail. The feasibility studies conducted in parts of rail other than welds were promising. Defect indications were seen very much separately from its surroundings. Accurate positioning of the defect is possible. Close lying defects can be seen separately which assures better resolution. Linear normal scans were very much suitable to detect cracks of complex geometries, as it gives a specific indication pattern each time when it is present.