Abstract: The new welding process avoids cracking in welding, in repair welding or in cladding of parts of metallic alloys which are sensitive to hot cracking. The process is using a first heat source (15), directed to the parts (11, 12) of the metallic alloy forming a melt pool (14) on the parts (11, 12) of metal or metallic alloy. The heat source (15) and the parts (11, 12) are moved relative to each other. The process is characterized in that there is one (13) or more additional heat sources directed to the parts (11, 12) of metal or metallic alloy and following the first heat source (15) in a distance and with substantially the same speed and in the same direction as the first heat source (15). The additional heat source (13) or heat sources are directed to the solidification region (mushy zone) (144) of the melt pool (14) generated by the first heat source (15).