Ultrasonic inspection of rough surface aluminium die castings
Most ultrasonic techniques developed in the die casting industry were to inspect castings with simple geometries and machined surfaces. A technique could not be described as non-destructive if it required alteration of a surface prior to inspection. This paper describes an investigation into the possibility of using an ultrasonic sensing-based nondestructive testing system to detect defects in aluminium die casting parts with rough surfaces. As the signal-to-noise ratio is very important in quantifying sub-surface defects, the major factors relating to noise creation in the ultrasonic signal during ultrasonic immersion testing were identified and addressed. The application of ultrasonic testing to inspect rough surface aluminium die castings with side-drilled holes to simulate porosity type defects is described in detail. Investigations indicate that the scattering from the rough surface of the castings masks the defect signal when the defect was close to the front surface. The results obtained from ultrasonic immersion testing indicated that focused ultrasonic probes operating at frequencies between 5 MHz and 10 MHz were best suited for the inspection of castings with surface roughness Ra values varying between 50 m and 100 m.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
Document Type: Research Article
Publication date: March 1, 2007
More about this publication?
- Official Journal of The British Institute of Non-Destructive Testing - includes original research and devlopment papers, technical and scientific reviews and case studies in the fields of NDT and CM.
- Information for Authors
- Submit a Paper
- Subscribe to this Title
- Information for Advertisers
- Terms & Conditions
- Ingenta Connect is not responsible for the content or availability of external websites