| 摘要 |
The method for directional solidification of a welding seam for deposit welding of a substrate (4) of a component, comprises hardening the component having dendrites (31), which extend itself into substrate dendrites direction. The process parameter such as laser power, welding beam diameter, powder-beam focus and/or powder flow is formed related to feed so that it leads to a local orientation of the temperature gradient on a solidification front (19), where the temperature gradient is smaller than 45[deg] for the substrate dendrites direction in the substrate. The method for directional solidification of a welding seam for deposit welding of a substrate (4) of a component, comprises hardening the component having dendrites (31), which extend itself into substrate dendrites direction. The process parameter such as laser power, welding beam diameter, powder-beam focus and/or powder flow is formed related to feed so that it leads to a local orientation of the temperature gradient on a solidification front (19), where the temperature gradient is smaller than 45[deg] for the substrate dendrites direction in the substrate. The relative velocity is 50 mm/minute and/or the power is 300 W and/or the diameter of the laser beam on the surface of the substrate is 4 mm and/or the mass flow rate is 400 mg/minute. A melt (16) is produced on the substrate and emerges in the substrate by the supply of powder (7) and/or material. The melt is completely covered by a laser beam and is overlapped. The powder is applied in layers. The substrate has a single crystal structure. The diameter of the powder particles is so smaller so that it has sufficiently high temperature in welding laser beam. The temperature of the molten powder particles is 20[deg] C above the melting temperature of the powder. A laser is used for welding. |
