SPEED-BRAKE CASTING, 8-73673, EVALUATION OF
Abstract
The multi-ribbed framework for the F-102A air plane speed brake door is an AZ91 magnesium alloy casting about 2-1/2 feet wide by 4-1/2 feet long. This complex casting, which essentially is a lattice of thin-walled ribs, is heat treated and aged prior to end use. Since excessive porosity was encountered with a large number of castings, correlations of the casting strengths with the results of dye-penetrant and radiographic inspection were required. As a result of comparisons of tensile strength data with dye-penetrant and radiographic inspections, the following conclusions were drawn: (1) dye-penetrant inspection is inadequate for determining acceptable limits of casting porosity; and (2) x-ray ratings correlated very well with tensile test results. Radiographic inspection thus was considered the more reliable inspection method.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 13, 1957
- Accession Number
- AD0407587
Entities
People
- H. C. Turner
- P. W. Bergstedt
- W. M. Sutherland
Organizations
- General Dynamics