METHOD FOR IGNITING AN ALUMINOTHERMIC MIXTURE AND DEVICE FOR PERFORMING THE METHOD

摘要

In order to reduce the strain on the accumulator (5) of a device for igniting an aluminothermic mixture (11) with a view to better energy use, a circuit arrangement is provided for regulating the current between the electrodes that are introduced into the mixture (11), in which circuit arrangement the current between the electrodes is continuously measured, wherein low-frequency sampling of the current profile is performed in a first channel (17) in order to continuously regulate the current, and high-frequency sampling of the current profile is performed in a second channel (19) for early detection of the onset of ignition of the mixture (11) and/or of a short-circuit. A signal is derived from the detection of the ignition and is used to limit or lower the current. The current regulation thus restricts the inflow of energy into the mixture (11) to a necessary level.