NDLI: Improved Lateral Focusing for Thin-Walled Gas Pipelines Girth Welds Using Phased Arrays

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Zhang, Jinchi Labbe´, Simon Moles, Michael
Copyright Year	2006
Abstract	With the arrival of high strength, thinner walled pipe steels, improved defect sizing is becoming more critical. Repairs become more detrimental to the pipe material properties, and Engineering Critical Assessment requires better sizing as the pipes become thinner. Improved focusing is particularly relevant in the horizontal (circumferential) direction, to both minimize repairs and to more accurately characterize intermittent defects. This paper describes the development of an ultrasonic phased array specifically to improve focusing. Extensive computer modeling was performed to determine the optimum array for thin-walled pipes with mechanical focusing (i.e. a curved array) and various curvatures. The modeling showed that a 60 element, 1 mm pitch array with a 100 mm curvature in the passive aperture gave significant improvements over a standard array (60 elements, 1 mm pitch, unfocused). This curved array was manufactured and tested on a commercial calibration block with flat bottomed holes. The experimental results showed that the curved 1D array had significantly better focusing than the standard (unfocused) array, as expected. The curved array oversized flat-bottom hole reflectors by only ∼ 1 mm, instead of the 4–6 mm from the standard array. These curved arrays can be used on standard AUT systems with no modifications to the general mechanics or software.
Sponsorship	Pipeline Division
Starting Page	209
Ending Page	214
Page Count	6
File Format	PDF
ISBN	0791842630
DOI	10.1115/IPC2006-10238
Volume Number	Volume 3: Materials and Joining; Pipeline Automation and Measurement; Risk and Reliability, Parts A and B
Conference Proceedings	2006 International Pipeline Conference
Language	English
Publisher Date	2006-09-25
Publisher Place	Calgary, Alberta, Canada
Access Restriction	Subscribed
Subject Keyword	Welded joints Computer simulation Computer software Pipelines Materials properties Calibration Maintenance Steel Modeling Pipes Diluents Optical mirrors
Content Type	Text
Resource Type	Article

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Special Phased Array Applications for Pipeline Girth Weld Inspections

Girth Welding of X100 Pipeline Steels

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Thermal Simulation and Its Experimental Verifications for Girth Welds in High-Strength Pipelines

The Essential Welding Variable Methodology and its Application in Welding Procedure Development for Mechanized Girth Welds of X100 Line Pipes

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Research on Phased Array Ultrasonic Testing for the Girth Weld of 4mm~10mm Austenitic Stainless Steel Pipeline

Inspection of Thin-Walled Pipe Welds Using Mechanized Ultrasonic Techniques

Simulation of Microstructure Evolution and Its Experimental Verifications for Girth Welds in High-Strength Pipelines

Improved Lateral Focusing for Thin-Walled Gas Pipelines Girth Welds Using Phased Arrays

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