IMPROVING THE FATIGUE PERFORMANCE OF WELDED ALUMINUM ALLOYS

An investigation was recently conducted at the David Taylor Naval Ship R&D Center (DTNSRDC), Bethesda, Md., to develop methods for improving the fatigue performance of welded 5086 alloy aluminum. Of the methods investigated, postweld brush shot peening offered the best improvement. A previous study had shown that the high-cycle fatigue performance of 5086 aluminum alloys, used for high-performance ship construction, was seriously degraded by welding. But, the recent DTNSRDC study showed that the strength of 5086 butt and fillet weldments could be significantly improved with peening intensities of 0.0035 to 0.0080 inch. Specifically, the fatigue strength of 5086 butt welds was improved to the level of unwelded base metal, and the strength of the fillet welds was increased from 5,500 to 10,000 psi at 10 to the (7) power cycles.

  • Corporate Authors:

    Columbia Research Corporation

    2531 Jefferson Davis Highway
    Arlington, VA  USA  22202
  • Publication Date: 1980-3

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Filing Info

  • Accession Number: 00311354
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 26 1980 12:00AM