Abstract: The present disclosure relates to a hollow shaft for an electric motor, which has a hollow cylindrical shaft body, wherein the shaft body has at least two rotationally symmetrical hollow components, which are positioned one inside the other and joined together using soldering, wherein a first hollow component has a central through opening having an inner diameter and a further hollow component is inserted in the first hollow component, wherein the further hollow component is joined to the inner circumference of the through opening of the first hollow component while bearing thereon.

Abstract: A method of manufacturing a fuel distributor is disclosed. The fuel distributor includes a distributor pipe for receiving pressurized fuel. The distributor pipe has a tubular main body produced from a forged blank processed mechanically. The unprocessed forged blank or the partially processed forged blank is heat treated at a temperature of between 850° C. and 1100° C., in particular of greater than or equal to 950° C., for a period of time of greater than or equal to 60 seconds.

Abstract: The present invention relates to an exhaust-gas heat exchanger for a motor vehicle, having an outer casing and plates arranged therein lying one above another in layers, wherein a fin plate made of austenitic steel material is arranged in an inner cassette made of ferritic steel material or made of duplex steel and at least two inner cassettes are arranged one above another like plates and the outer casing is formed from duplex steel and engages around the inner cassettes.

Abstract: In a method of producing an exhaust-gas heat exchanger of a motor vehicle, at least one component of the exhaust-gas heat exchanger, e.g. an outer jacket or ducts arranged in the outer jacket or metal sheets, is subjected to an electrochemical machining process to produce a homogenous and smooth surface. The electrochemical machining process may involve plasma-polishing or electro-polishing.