Abstract: The invention relates to a method and a device for crack-free welding, repair welding, or buildup welding of metallic materials which are susceptible to hot cracking. Objects in which its application is expedient and advantageous are all components which comprise multiphase solidification alloys having a broad solidification interval or are constructed from alloys which contain alloy elements or contamination elements which form a low-melting-point eutectic material with one or more main alloy elements and which are to be joined using fusion welding methods of high power density.