Investigation into Interface Lifting Within FSW Lap Welds

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Friction stir welding (FSW) is rapidly penetrating the welding market in many materials and applications, particularly in aluminum alloys for transportation applications. As this expansion outside the research laboratory continues, fitness for service issues will arise, and process control and NDE methods will become important determinants of continued growth. The present paper describes research into FSW weld nugget flaw detection within aluminum alloy lap welds. We present results for two types of FSW tool designs: a smooth pin tool and a threaded pin tool. We show that under certain process parameters (as monitored during welding with a rotating dynamometer that ... continued below

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Miller, K. S.; Tolle, C. R.; Clark, D. E.; Nichol, C. I.; McJunkin, T. R. & Smartt, H. B. June 1, 2008.

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Friction stir welding (FSW) is rapidly penetrating the welding market in many materials and applications, particularly in aluminum alloys for transportation applications. As this expansion outside the research laboratory continues, fitness for service issues will arise, and process control and NDE methods will become important determinants of continued growth. The present paper describes research into FSW weld nugget flaw detection within aluminum alloy lap welds. We present results for two types of FSW tool designs: a smooth pin tool and a threaded pin tool. We show that under certain process parameters (as monitored during welding with a rotating dynamometer that measures x, y, z, and torque forces) and tooling designs, FSW lap welds allow significant nonbonded interface lifting of the lap joint, while forming a metallurgical bond only within the pin region of the weld nugget. These lifted joints are often held very tightly together even though unbonded, and might be expected to pass cursory NDE while representing a substantial compromise in joint mechanical properties. The phenomenon is investigated here via radiographic and ultrasonic NDE techniques, with a copper foil marking insert (as described elsewhere) and by the tensile testing of joints. As one would expect, these results show that tool design and process parameters significantly affect plactic flow and this lifted interface. NDE and mechanical strength ramifications of this defect are discussed.

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  • Trends in Welding, The 8th International Conference,Pine Mountain, Georgia USA,06/02/2008,06/05/2008

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  • Report No.: INL/CON-08-14900
  • Grant Number: DE-AC07-05ID14517
  • Office of Scientific & Technical Information Report Number: 969507
  • Archival Resource Key: ark:/67531/metadc929492

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 1, 2008

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  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 29, 2016, 4:23 p.m.

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Miller, K. S.; Tolle, C. R.; Clark, D. E.; Nichol, C. I.; McJunkin, T. R. & Smartt, H. B. Investigation into Interface Lifting Within FSW Lap Welds, article, June 1, 2008; [Idaho]. (digital.library.unt.edu/ark:/67531/metadc929492/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.