| abstract |
Method for the directional solidification of a weld seam (13) during application lapping, in particular for build - up welding of a substrate (4) of a component (1) which is directionally solidified and has dendrites (31) extending in a substrate dendrite direction (32) in which the Process parameters with respect to feed, laser power, welding beam diameter, Pulverstrahlfokus and / or powder mass flow are designed such that they lead to a local orientation of the temperature gradient (28) on a solidification front (19) which is less than 45 to the substrate dendrite direction (32) of the dendrites (31) in the substrate (4), wherein the relative velocity is between 30mm / mm and 100mm / mm, preferably 50mm / mm and / or the power is between 200W and 500W, preferably 300W and / or the diameter of the laser beam on the surface of the substrate between 3mm and 6mm, preferably 4mm and / or the mass feed rate between 300 mg / mm and 600 mg / mm, preferably at 400 mg / mm. |