Mtu Motoren-Und Turbinen-Union Muenchen, Gmbh

Erich Thaler

Dieter Schneefeld

Hans Wilhelm

Dietmar Helm

Karl Katheder

Georg Muschal

The invention relates to a friction welding process for mounting blades of a blade carrier (,) of a flow machine as well as a shielding gas shower for supplying gas to welding surfaces. To achieve this, a plurality of longitudinally extending welding surfaces (,) are provided on the circumference of the blade carrier (,), are oriented at a blade angle &bgr; relative to the rotation axis (R) of the blade carrier (,), and are respectively welded together with a welding surface (,) of a blade (,). The welding temperature necessary for joining the bodies (blade carrier (,), blade (,)) is achieved by pressing together the welding surfaces (,) and simultaneous oscillating relative motion (P) of the bodies (,) in the welding plane (E), whereby a shielding gas (S) flows around the welding surfaces (,) during the relative motion (P). The shielding gas flow S follows the contour of the blade carrier and the blade and thus serves to provide a closed shielding gas curtain for protecting the welding surface. In order to ensure a gas supply to the welding surfaces from all sides to the extent possible during the relative motion, the shielding gas shower, which is stationary relative to one of the bodies, comprises a gas outlet opening facing the welding surfaces.

Friction welding process and shielding gas shower for carrying out the process

The invention is directed to a friction welding process for mounting blades of a rotor for a flow machine. A plurality of oblong welding surfaces are provided at a circumferential surface of a carrier and are respectively welded to a welding surface of a blade. The welding temperature is generated by pressing the welding surfaces together and by an oscillating relative motion between the blade and the carrier in the welding plane. At least the blade or the carrier is additionally heated to a temperature lying below the welding temperature in the region of the welding surface.

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Dachau, Germany

Erich Thaler