Stirtec Gmbh

University of Münster

Thomas Weinberger

Gunter Figner

Herbert Danninger

Christian Gierl-Mayer

Ozan Caliskanoglu

Christian Pfeiffer

Lucas Oppeneiger

Christian Gierl-mayer

A friction stir welding tool for a machine tool having a frame and a spindle rotatable relative to the frame. The friction stir welding tool includes a pin, a shoulder, and a drive shaft connectable to the spindle to set the pin and shoulder in rotational motion about a rotation axis, wherein the shoulder is rotatable relative to the pin about the rotation axis. To obtain different speeds of the pin and shoulder in a simple and robust manner, a planetary transmission having a ring gear, a planet carrier, and a sun gear is connected to the drive shaft, pin, and shoulder. The pin or the shoulder is connected to the planet carrier so that the pin and shoulder are set in rotation about the rotation axis at different rotational speeds, but in the same rotation direction, by driving the drive shaft by the spindle.

Friction stir welding tool and friction stir welding method

A friction stir welding tool includes a rotation-symmetrical shaft having a proximal end, a distal end, and a pin, which is arranged concentrically about the rotation axis and which has a smaller diameter than the shaft at the proximal end thereof, and thus projects as compared to a shoulder region of the shaft. The shaft, at least in the shoulder region, and the pin each consists of a high-temperature-resistant metal or an alloy thereof. The pin and/or the shaft in the shoulder region consist of or are coated by a composite material, which substantially consists of molybdenum, tungsten, niobium or tantalum or an alloy of at least one of these metals, and a reinforcement phase embedded therein and consisting of at least one material having a Mohs hardness &#x3e;6, a micrometer particle size, and a free enthalpy of formation at 1300 K of less than &#x2212;350 kJ/mol O.

Friction stir welding tool

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Graz, Austria

Thomas Weinberger