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The application is used to treat a wide variety of materials. This is because, when certain strength values are reached following thermal processes with subsequent quenching, it is possible that very hard structural components are formed, which can cause cracks or ruptures.

To prevent this phenomenon, for example steels with a carbon content of more than 0.22%, which can only be welded under certain conditions, are preheated constantly to a certain temperature in the region directly adjacent to the weld seam so that they cool more slowly and as a result the occurrence of hardened, brittle regions which are susceptible to cracks is ruled out.

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