The resistance soldering technique includes machines, soldering devices and components for resistance soldering of electrically conductive components. During resistance soldering, the joining parts are pressed together by means of pliers or welding heads and are electrically melted by applying current solder at the contact point between the components. After heating, the current supply is interrupted and the solder is solidified, filling up small cracks and unevenness. The resistance brazing is usually used for brazing in the temperature range of 450-900 ° C., and high-temperature soldering over 900 ° C. is also possible. In principle, the soldering units correspond to resistance welding devices but are operated for soldering at temperatures below the melting point of the joining parts. Compared to resistance welding, resistance soldering is slightly slower, more technically more expensive and more expensive in operation, since solder is required as an additional material, but allows the joining of different materials as well as high-strength material-bonding joints without any significant structural transformation. Necessary components of the resistance soldering technique are tongs or soldering units, a solder supply, a current source with a transformer, the control and, if necessary, a process monitoring system. Resistance brazing is suitable for the production of high-strength material-to-material connections between parts made of electrically conductive metals without significant structural changes. The area of application is, in particular, the brazing of components with simple geometries as well as of flat connections. High-strength connections of parts made of different materials are also possible. Resistance soldering is also suitable for joining components of different sizes, which can not be welded.