Patent ID: 9592564
Date: 2017-03-14
CPC Classifications: B23K

Claim:
1. A method for producing a three-dimensional material composite of at least two metal bodies, wherein the at least two metal bodies are initially assembled such that surface areas to be connected loosely abut on one another, wherein said composite is then heated to a target temperature and in doing so said surface areas are pressed against one another such that no gap remains, whereby a positive-locking and/or firmly bonded connection is produced between the surface areas of the at least two metal bodies, wherein the pressure required for pressing the surface areas against one another is generated by arranging at least one expansion cavity with a predefined initial volume in one of the at least two metal bodies or in an additional expansion body, which additional expansion body abuts on at least one of the at least two metal bodies, in such a way that, during an expansion of the expansion cavity, the surface areas to be connected are pressed against one another, wherein a predefined amount of at least one substance is filled into the expansion cavity and hermetically confined, wherein said substance is gaseous at least at the target temperature or forms, prior to reaching the target temperature, at least one substance in a predefined proportion that is gaseous at the target temperature, wherein an inner wall of the expansion cavity consists of a material that cannot absorb the at least one gaseous substance and cannot react therewith such that the amount of the at least one gaseous substance changes, wherein the predefined amount of substance is chosen such that a predefined pressure is reached in the expansion cavity upon reaching the target temperature, and wherein this predefined pressure suffices for closing any existing gaps between the surface areas to be connected due to a deformation of the metal body containing the expansion cavity or the additional expansion body, respectively, and at least one of the abutting metal bodies.