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NASA Technical Reports Server (NTRS) 20030003721: Macrostructure of... |
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by NASA Technical Reports Server (NTRS) |
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This paper will discuss two of the well know large scale |
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features of friction stir welds: the "onion rings" seen |
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in transverse sections, and the striations on the surface |
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of the work piece. It will be shown that the surface |
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features (sometimes called "tool marks") are the result |
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of irregularities on the rotating shoulder of the pin |
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tool and disappear when the shoulder is polished. The |
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"onion ring" structure seen in transverse cross sections |
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is formed by parts of the "carousel", the zone of |
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material adjacent to and rotating with the pin tool, that |
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are shed off in each rotation. The relation between the |
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carousel and the "ring vortex", a rotational flow |
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extending both in and out of the carousel and resembling |
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a smoke-ring with the hole centered on the pin tool, will |
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be discussed. |
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Date Published: 2016-10-20 04:31:30 |
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Identifier: NASA_NTRS_Archive_20030003721 |
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Item Size: 20964631 |
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Language: english |
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Media Type: texts |
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