ELECTROTHERMAL NONDESTRUCTIVE TESTING OF METAL STRUCTURES

THE ELECTROTHERMAL METHOD IS A NONDESTRUCTIVE TESTING METHOD APPLICABLE TO METAL PARTS AND STRUCTURES. WELDS MAY BE TESTED FOR VOIDS, CRACKS AND SLAG INCLUSIONS. RELATIVELY COMPLEX MACHINED OR CAST PARTS MAY BE TESTED. MODERATE SURFACE WAVINESS DOES NOT AFFECT THE TEST. TO APPLY THE ELECTROTHERMAL METHOD, THE SPECIMEN IS SUBJECTED TO AN ELECTRICAL CURRENT PULSE TO DEVELOP A SURFACE TEMPERATURE DISTRIBUTION THAT IS INDICATIVE OF INTERNAL DEFECTS. THIS DISTRIBUTION IS MAPPED BY INFRARED OR OTHER THERMAL IMAGING TECHNIQUES, SUCH AS THE APPLICATION OF THERMOGRAPHIC PHOSPHOR OR LIQUID CRYSTAL. DEFECT INDICATIONS ARE SUPERIMPOSED UPON THE NORMAL TEMPERATURE PROFILE OF A GOOD PART OR WELD, BUT CAN USUALLY BE EASILY SEPARATED FROM THE NORMAL PROFILE. /AUTHOR/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00255327
• Authors:
  • Mccullough, L D
  • GREEN, D R
• Publication Date: 1972-4

Media Info

• Features: Figures; References;
• Pagination: p. 87-91
• Serial:
  • Materials Evaluation
  • Volume: 30
  • Issue Number: 4
  • Publisher: American Society for Nondestructive Testing
  • ISSN: 0025-5327

Subject/Index Terms

• TRT Terms: Electric current; Electrical equipment; Metals; Nondestructive tests; Quality control; Welding
• Old TRIS Terms: Electric gradient; Quality control testing; Thermogradient
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00217206
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 5 1972 12:00AM