of 700 u00b0 c to 750 u00b0 c preferably 730 u00b0 c in this case the components are conveyed through the furnace in a cyclical fashion this means that a furnace support is transported by a respectively fixed distance from station to station and then in this station in whose position it is precisely kept is stopped for a certain amount of time for example 15 seconds before the furnace support together with the component is advanced exactly to the next station and remains in it in turn for a holding time after the furnace section i the support together with the component travels into the furnace section ii in which a three dimensionally contoured radiating element is situated above all or part of the cycle stations after the arrival at the station either the three dimensionally contoured radiating element is lowered onto the component or the component is raised and positioned with a predetermined always equal distance from the component in the region covered by the radiating element the component is acted on with thermal radiation in such a way that either by means of a single radiating element or by means of a plurality of radiating elements arranged one after the other in the cycle.