Method for determining the temperature in a joining zone

Abstract

The invention relates to a method for determining the temperature in a joining zone in a vibration welding process, wherein a first joining partner () and a second joining partner () are welded together, characterised in that the first and second joining partners () act as a thermocouple, wherein, using a first measuring element () contacting the first joining partner () at a cold site () and a second measuring element () contacting the second joining partner at a distance from a hot site (), a potential difference (P) between the first and second joining partners () is detected during the welding process: wherein the second measuring element () has a higher temperature than the temperature of the cold site () in the region of contact with the second joining partner () and has a material of the same type as the second joining partner (): the potential difference (P) is compared with material-specific calibration data and processed using a data processing system () and the welding process is controlled according to the determined potential difference (P): the first joining partner () is in the form of a multi-wire cable: the first measuring element () is in the form of a measuring line, which is connected to the first joining partner () by its first end and connected to a data processing system () at a measuring point () by its second end: the first joining partner () and/or the first measuring element () are made from aluminium; the second joining partner () and/or the second measuring element () are made from copper; and the temperature of the cold site corresponds to the ambient temperature of approx. 20° and the contacting takes place in the region of the hot site () at a temperature greater than the ambient temperature.