Friction stir welding tool for welding variable thickness workpi

Details Friction stir welding tool for welding variable thickness workpi Friction stir welding tool for welding variable thickness workpi

1996-05-31

1998-02-17

Heinrich, Samuel M.

Metal fusion bonding

Process

Using dynamic frictional energy

228 21, 156 735, 156580, B23K 2012

Patent

active

057183660

ABSTRACT:
A friction stir welding tool for welding workpieces of variable thickness. The tool is characterized in that the displacement between a shoulder that presses down on an upper surface of the weld, and a tip of a rotating pin that penetrates and softens the workpiece to form the weld, is variable. In one embodiment, when the tool is used in conjunction with an apparatus that allows the shoulder of the tool to ride on and track the workpiece surface, the shoulder is stationary relative to the tool body, and the pin reciprocates relative to the shoulder to maintain contact with the backing plate, thereby providing a weld throughout the workpiece. In another embodiment, when the tool is used on an apparatus that holds the tool in fixed relationship to a backing plate on which the workpiece is held, the shoulder is able to reciprocate relative to the tool, following the upper surface contours of the workpiece, while the pin is able to penetrate through to the rear side of the workpiece to produce a uniform weld.

REFERENCES:
patent: 4103138 (1978-07-01), Moriki
patent: 5460317 (1995-10-01), Thomas et al.
Abstracts and Exemplary Claims of U.S. Patents, pp. 6-14, for: Patent No. 5,469,617; Patent No. 5,460,317, Patent No. 5,262,123 Patent No. 4,811,887 Patent No. 4,605,151 Patent No. 3,460,235 Patent No. 5,170,031 Patent No. 4,959,241.

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