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. In the method according to the invention, the traveling local temperature application is performed by two electromagnetic temperature fields, which run parallel or nearly parallel to the welding direction on both sides, and extend longitudinally to the welding direction, are generated by a volume energy source in the interior of the components, both temperature fields beginning in front of the welding zone viewed in the welding direction and their temperature maxima being located outside the thermal influence zone and behind the solidification zone in the welding direction, the depth of the temperature fields at least reaching the weld seam depths at the location of the temperature maximum. In the device according to the invention, the auxiliary energy source is a volume energy source and is connected to the welding head and follows the movement of the welding head.
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