Mahle International Gmbh

Manufacturing Technology, Inc.

Lapp, Michael, T.

Dietmar Spindler

Michael T Lapp

Luiz Perrone

Alex Antoc

Robert W Adams

Jeff Lovin

Dan Kuruzar

A pre-finished piston part is disclosed that may be used to form a piston assembly. A pre-finished piston may include a lower part defining a piston axis, the lower part having a skirt and forming a lower surface of a cooling gallery. The lower part may include a radially inner bowl surface defining a lower part radially inner mating surface. The pre-finished piston assembly may further include an upper part having a radially outer bowl surface meeting the radially inner bowl surface at a radially inner joint. The upper part may include a radially inner wall defining a radially inner upper part mating surface. The radially inner wall may define a radially inwardly facing surface that defines a non-parallel angle with the radially inner bowl surface where the radially inner bowl surface meets the radially innermost edge of the radially inner mating surface.

Welded piston assembly

A method and system of inertia friction welding that enables the production of inertia friction welds in which the final upset can be controlled to an operator specified target. The method utilizes any profile-based upset control technique, including but not limited to torque modulation and pressure (load) modulation. The method dynamically modifies the profile upset setpoints to systematically drive the upset formation to produce a weld with the targeted upset. The method and system also enables the production of inertia friction welds in which the final welded part length can be controlled to an operator specified target. The system and associated method comprises inertia friction welding a pair of sample parts to form a sample weld while acquiring data relating to the formation of the sample weld. The system and associated method also comprises inertia friction welding a pair of production parts to form a production weld using the profile data acquired during the friction welding of the pair of sample parts to achieve the predetermined upset formation.

Method and system of inertia friction welding

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Niles, MI, United States of America

Dietmar Spindler