Abstract: The invention relates to a process and devices for cleaning welding torches, for example in automated welding lines, on welding robots and in single-piece production, by means of a cold medium, preferably CO2 dry ice, the CO2 snow produced by expanding the pressurised liquid CO2 being directly applied with low density in a uniform or intermittent manner to the surfaces to be cleaned of the contact pipe and gas nozzle by means of a cleaning head that fits the burner.