A NEW ROTATING-PROBE EDDY CURRENT METHOD FOR INSPECTING BAR SURFACE

This paper describes new eddy current test equipment developed by Bethlehem Steel for inspecting asrolled bars for surface defects. The equipment has been installed and used in production to inspect 1 3/4 to 4 in. (44 to 101 mm) round bars. The equipment rotates an eddy current probe around an advancing bar with the probe held a preset minimum distance from the bar surface. Key features of the bar-testing equipment are that it: 1) maintains a constant test sensitivity for varying probe-to-bar spacing, 2) indicates as defective only those defects which exceed a preselected length and depth, and 3) automatically paint-marks detected defects. /Author/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00255327
• Supplemental Notes:
  • Presented at the National Fall Conference of the American Society for Nondestructive Testing, Oct. 1974, Detroit, Mich.
• Corporate Authors:

  American Society for Nondestructive Testing

  914 Chicago Avenue
  Evanston, IL  United States  60202
• Authors:
  • Hoffman, J P
• Publication Date: 1975-10

Media Info

• Features: Figures; Photos; References;
• Pagination: p. 237-242
• Serial:
  • Materials Evaluation
  • Volume: 33
  • Issue Number: 10
  • Publisher: American Society for Nondestructive Testing
  • ISSN: 0025-5327

Subject/Index Terms

• TRT Terms: Defects; Eddy currents; Inspection; Metal bars; Nondestructive tests; Testing equipment
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00127508
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 14 1976 12:00AM