Skip to main content

Defect evaluation using the alternating current field measurement technique

Buy Article:

$25.00 plus tax (Refund Policy)

Abstract:

ACFM is often used to search for surface longitudinal cracks in weld seams, for which the technique will have maximum sensitivity to. Attempts are always made where possible to scan with the probe centre over the crack and along the crack for maximum sensitivity to the crack. However, inevitably, this is not always possible with cracks deviating from expected paths. This report details results of the effect of scanning at different angles to the crack (not parallel), scanning not directly over the crack, scanning with lift-off, the effect of probe angulation (ie probe wobble) and also evaluating the accuracy for surface crack depth sizing. Most of the specimens were fabricated from the commonly utilised ASTM-A36 structural steel with accurately fabricated EDM and containing real defects.

It was shown that the ACFM technique is generally reliable for detection and accurate sizing of surface defects in air or in water.

The essentials of an algorithm which will automate crack detection and sizing is also described.

Document Type: Research Article

DOI: https://doi.org/10.1784/insi.46.10.598.45209

Affiliations: 1: The Republic of Singapore Air Force. 2: The Robotics Research Centre, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore.

Publication date: 2004-10-01

More about this publication?
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more