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Study of radiographic linear indications and subsequent microstructural features in gas tungsten arc welds of inconel 718
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Clounch, J. L. Russell, C. K. Nunes, A. C. Walley, J. L. |
| Copyright Year | 2007 |
| Description | This study presents examples and considerations for differentiating linear radiographic indications produced by gas tungsten arc welds in a 0.05-in-thick sheet of Inconel 718. A series of welds with different structural features, including the enigma indications and other defect indications such as lack of fusion and penetration, were produced, radiographed, and examined metallographically. The enigma indications were produced by a large columnar grain running along the center of the weld nugget occurring when the weld speed was reduced sufficiently below nominal. Examples of respective indications, including the effect of changing the x-ray source location, are presented as an aid to differentiation. Enigma, nominal, and hot-weld specimens were tensile tested to demonstrate the harmlessness of the enigma indication. Statistical analysis showed that there is no difference between the strengths of these three weld conditions. |
| File Size | 1755934 |
| Page Count | 48 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20080002286 |
| Archival Resource Key | ark:/13960/t7hq8x87s |
| Language | English |
| Publisher Date | 2007-09-01 |
| Access Restriction | Open |
| Subject Keyword | Mechanical Engineering Radiography Welded Joints Weld Strength Metallography Gas Tungsten Arc Welding Microstructure Inconel Trademark Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
