The Effects of Magnetizer Velocity on Magnetic Flux Leakage Signals
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
In many magnetic flux leakage applications, the nondestructive inspection constraints suggest the use of high inspection velocities. However, high inspection velocities can compromise the ability to detect and characterize defects. In general, velocity effects can be detected at speeds exceeding a few miles per hour [1]. These effects need to be quantified in order to have a complete understanding of the capability of the inspection system. This paper presents the application and results of axis- symmetric finite element modeling for the examination of the effects of the magnetizer speed on flux leakage signals. The specific problem addressed is large diameter pipeline steels, and a velocity range of from 0 to 15 miles per hour. The modeling examines the interaction of the magnetizer, pipe material and metal loss defects. Experimental confirmation of selected results is also provided.