RADIOGRAPHIC METHOD FOR THE DETECTION OF RESIDUAL CORE MATERIAL COMPRISING THE USE OF RADIOGRAPHICALLY DETECTABLE POWDER
First Claim
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1. The method of detecting presence of core material in a casting having internal passages which comprises injecting a radiographically detectable powder into said passages, vibrating the casting to aid in distributing said powder throughout said passages, exposing the thus treated casting to penetrating radiation, and inspecting the casTing.
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Abstract
Method of detecting the presence of core material in a cored casting comprising injecting a radiographically detectable powder into the passages of the hollow casting, vibrating the casting to aid in distributing the powder throughout the passages, exposing the treated casting to penetrating radiation, and then inspecting the casting.
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Citations
11 Claims
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1. The method of detecting presence of core material in a casting having internal passages which comprises injecting a radiographically detectable powder into said passages, vibrating the casting to aid in distributing said powder throughout said passages, exposing the thus treated casting to penetrating radiation, and inspecting the casTing.
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2. The method of claim 1 in which the product of the mass attenuation coefficient and the packing fraction of said powder is within 30% of the mass attenuation coefficient of the casting.
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3. The method of claim 1 in which the powder size is in the range from -40 to 625 Tyler mesh.
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4. The method of claim 1 in which the powder size is in the range from -100 to +400 Tyler mesh.
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5. The method of claim 1 in which the casting is vibrated at a peak acceleration of at least 20 meters per second squared.
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6. The method of claim 1 in which said casting is composed of an alloy selected from the group consisting of nickel and cobalt base alloys and said powder is molybdenum.
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7. The method of claim 5 in which the frequency of vibration is in the range from 10 to 20,000 Hertz.
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8. The method of detecting the presence of core material in a casting having internal passages which comprises injecting a radiographically detectable powder into said passages, the product of the mass attenuation coefficient and the packing fraction of said powder being within 30 percent of the mass attenuation coefficient of the metal of the casting, said powder having a particle size in the range from -40 to +625 Tyler mesh, vibrating the casting at a frequency of from 10 to 20,000 Hertz to achieve a peak acceleration of at least 20 meters per second squared in said casting, exposing the thus treated casting to penetrating radiation, and measuring the radiation passing through the casting.
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9. The method of claim 8 in which the measurement is carried out fluoroscopically.
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10. The method of claim 8 in which the measurement is carried out photographically.
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11. The method of claim 8 in which the measurement is carried out by electronic image enhancement.
Specification
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Current AssigneeClyde R. Honeycutt, Frank J. Sattler
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Original AssigneeClyde R. Honeycutt, Frank J. Sattler
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InventorsHoneycutt, Clyde R., Sattler, Frank J.
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Primary Examiner(s)Borchelt, Archie R.
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Application NumberUS04/862,658Time in Patent Office790 DaysField of Search250/65,71,43.5D,83.3DUS Class Current250/302CPC Class CodesG01N 23/043 using fluoroscopic examinat...
