Patent ID: 7703654

Claim:
A friction stir welding device, comprising: a first spindle, the first spindle comprising a pin tool, a first collet connected to a back end of the pin tool and inserted into a first tool holder, the first tool holder configured to receive the first collet and to connect the first collet and the pin tool to a first drive spindle, the first drive spindle configured to connect the first tool holder to a first motor, and the first motor connected to the first drive spindle such that the first motor rotates the first drive spindle, the first tool holder, the first collet, and the pin tool around a central axis of the friction stir welding device in a first direction; and a second spindle, the second spindle comprising a shoulder tool, a second collet connected to a back end of the shoulder tool and inserted into a second tool holder, the second tool holder configured to receive the second collet and to connect the second collet and the shoulder tool to a second drive spindle via a union nut, the second drive spindle configured to connect the second tool holder to a second motor, and a second motor connected to the second drive spindle such that the second motor rotates the second drive spindle, the second tool holder, the second collet, and the shoulder tool around the central axis of the friction stir welding device in a second direction opposite the first direction, wherein the first spindle is inserted within the second spindle and is movable along the central axis within the second spindle such that the pin tool extends from and retracts within the shoulder tool while the pin tool and the shoulder tool independently rotate.