APPARATUS FOR FRICTION STIR WELDING

  • US 20120248174A1
  • Filed: 04/02/2012
  • Published: 10/04/2012
  • Est. Priority Date: 04/01/2011
  • Status: Active Grant
First Claim
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1. An apparatus for friction stir welding, said apparatus comprising:

  • a pin configured to be driven in a rotating manner about an axis of rotation and including a drive end and a free end,wherein between the drive end and the free end a cylindrical engaging portion is provided, with the engaging portion extending axially in the direction of the axis of rotation, and including a circumferential surface configured for engagement with one or more workpieces;

    a first shoulder element arranged on a side of the engaging portion that is adjacent the drive end and is arranged concentrically around the pin with respect to the axis of rotation,said first shoulder element including a first bearing surface that faces the engaging portion and extends perpendicularly to the axis of rotation; and

    a second shoulder element arranged on a side of the engaging portion that is adjacent the free end and is arranged concentrically around the pin with respect to the axis of rotation,said second shoulder element including a second bearing surface that faces the engaging portion and extends perpendicularly to the axis of rotation,wherein the second bearing surface extends to the engaging portion,wherein the first shoulder element and the second shoulder element are configured to bear against opposite, respective first and second surfaces of the one or more workpieces,wherein the second shoulder element is connected to the pin so as to be freely rotatable relative thereto about the axis of rotation.

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