X-ray Computed Tomographic Inspection of Castings
نویسندگان
چکیده
Casting is an economical way to manufacture parts. On average, complex aerospace castings incur about one-fourth the cost of forgings. However, castings can not be used as primary structure in aircraft because of poor control over design allowables for the material strength and ductility. They can be used as secondary structure, but must include significant safety factors usually between 3 and 6. The safety factor increases the overall weight of the casting, which defeats the cost and weight savings that castings offer. Finally, the criteria for accepting castings has very little to do with their ability to provide operational service. That is, the present inspection criteria are not requirements on casting performance, but rather comparison to a qualitative standard. If a method of nondestructive evaluation of castings could be implemented that would allow a quantitative analysis of the casting suitability for service, then a significant increase in casting utilization with a reduction in design weight and overall product cost may be possible.
منابع مشابه
Processing Digital X-ray Images and Its Application in the Automated Visual Inspection of Aluminum Castings
In this paper we present a brief overview of several techniques used in digital image processing for X-ray testing. The paper introduces the reader to the image processing theory employed in this NDT. Methodologies and principles will be outlined. Some application examples are given when inspecting aluminum castings followed by the limitations of the applicability of the methodologies used.
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