Friction stir welding pin with internal flow channels
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United States of America Patent
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Mar 27, 2001
Grant Date -
N/A
app pub date -
Jul 13, 2000
filing date -
Jul 13, 2000
priority date (Note) -
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Abstract
A friction stir welding pin having internal flow cavities. The pin is adapted to be driven by a conventional friction stir welding machine, and may include external threads for forcing plasticized material toward the weld root. An internal cavity located along the centerline and open to the distal end facilitates deformation of the workpiece material at the weld root. One or more flow channels extending from the sidewall of the pin to the internal flow cavity induce a continuous path of plasticized metal through the pin. The internal cavity may include internal threads to further help force plasticized material toward the root weld. The pin is particularly useful in welding aluminum work pieces where the tolerance of the workpiece thickness is not critical.
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