Abstract: A laser metal deposition process is disclosed for carrying out laser metal deposition, whereby the component is metallurgically bonded to partially molten filler material by means of a laser beam directed onto a surface of a component, whereby the filler material is delivered into the laser beam as a powder jet of particles, whereby the particles absorb optical energy from the laser beam in a beam-particle interaction zone at a distance (A) from the surface of the component as a function of process parameters (P) of the laser metal deposition process and of the grain fraction and material properties of the particles and are applied to the surface of the component, whereby the process parameters (P) are adjusted such that at least a proportion of the particles reach the boiling temperature (S) along their trajectory through the laser radiation.

Abstract: A method for generating, in layers, an application structure made of high heat resistant super alloys on a substrate is provided. A powdery construction material is melted by an energy beam at a working point, wherein the working point is guided across the substrate along a primary movement direction and thus swings transversely to the primary movement direction. The working point thereby swings from a first edge of a respective layer of the application structure to a second edge of the layer. In this way, a time interval passes between departure from a respective edge and a return to the respective edge directly following the departure, such that a melt bath on the respective edge solidifies into a paste-like zone during the time interval.

Abstract: Applying material along parallel welding lines per welding layer, and changing a direction of extension of the welding tracks by 90° for the next welding layer, is provided.

Abstract: The use of a laser beam, which has an external and an internal laser beam area with different intensities allows a higher temperature gradient to be produced along the z direction, is provided.

Abstract: A device for laser hardfacing is provided, in which a scanner installation and a feed installation for a material provided for hardfacing are disposed so as to be interconnected. The device furthermore includes a laser installation and a control installation. Wobbling of the laser beam during the laser hardfacing can be carried out by the device. A method for laser hardfacing using a wobbling movement is furthermore provided.

Abstract: A method and component of coating layers having different thicknesses are produced by the variation of the powder mass flow, whereby the microstructure of the entire build-up welded area is adjusted in a targeted and an advantageous manner is provided.

Abstract: Provided are build-up welds which are achieved by means of a targeted frequency selection and an amplitude which relates to the diameter of the energy beam.

Abstract: Applying material along parallel welding lines per welding layer, and by changing direction of extension of the welding tracks by 90° for the next welding layer, provided.

Abstract: A method for generating, in layers, an application structure made of high heat resistant super alloys on a substrate is provided. A powdery construction material is melted by an energy beam at a working point, wherein the working point is guided across the substrate along a primary movement direction and thus swings transversely to the primary movement direction. The working point thereby swings from a first edge of a respective layer of the application structure to a second edge of the layer. In this way, a time interval passes between departure from a respective edge and a return to the respective edge directly following the departure, such that a melt bath on the respective edge solidifies into a paste-like zone during the time interval.

Abstract: An oscillating welding method is provided. The oscillating movement during welding in the vertical and/or horizontal direction results in smaller grains being obtained, the smaller grains preventing the development of cracks during welding.

Abstract: A process for welding directionally solidified metallic materials is presented. Process parameters are targeted selected with respect to laser welding, advancement, laser power beam diameter and powder mass flow. The temperature gradient, which is fundamentally decisive for the single-crystal growth during laser cladding, may be set in a targeted manner.

Abstract: During welding, frequently cracks develop at the end of the weld seam. A method is provided in which the power is reduced at the end of the weld seam, reducing the development of cracks. For the method, a welding appliance is used wherein the welding appliance may be a laser.

Abstract: A method of welding workpieces of high-temperature superalloys is provided. Welding filler is applied in a plurality of layers to a surface of the workpiece via a heat input zone and a supply zone for supplying the welding filler into the heat input zone. The heat input zone and the supply zone on the one hand and the workpiece surface on the other hand are moved in relation to one another. A polycrystalline weld seam is generated by remelting a previously applied layer of the plurality of layers. Welding parameters are chosen such that a cooling rate during a solidifying of the material is at least 8000 Kelvins per second. Further, a welding apparatus for carrying out such a method is provided.

Abstract: The use of a laser beam, which has an external and an internal laser beam area with different intensities allows a higher temperature gradient to be produced along the z direction, is provided.

Abstract: Welding repairs are often carried out on directionally solidified components that nevertheless do not possess the desired crystallographic surface alignment, which reduces mechanical strength. The method provided selects the direction of travel depending on the crystallographically preferred direction of the substrate such that no more misorientations occur. A laser beam may be used for remelting.

Abstract: A welding method for welding workpieces made of highly heat-resistant superalloys is provided. The method includes generating a heat input zone on the workpiece surface by means of a heat source, feeding welding filler material into the heat input zone by means of a feeding device, and generating a relative motion between the heat source and the feeding device on one hand and the workpiece surface on the other hand by means of a conveying device. Furthermore, according to the welding method, the mass feed rate is ?350 mg/min.

Abstract: In order to obtain crack-free, homogeneous welds in nickel-based superalloys, laser parameters in respect of the power, the beam diameter, the mass feed rate, and the speed of advancement, are specifically selected.

Abstract: By way of the targeted selection of method parameters in laser welding, namely feed rate, laser power beam diameter and powder mass flow, the temperature gradient can be set in a targeted manner, which temperature gradient is decisive for the single crystal growth during laser build-up welding.

Abstract: A process for welding a component in which a recess is filled by welding tracks is provided. The process includes providing a recess with a contour which delimits an outer upper surface of the component with respect to the recess. The welding tracks are laid such that the welding tracks also reach the surface outside a contour of the recess and that a plurality of welding layers are used in order to fill the recess until a last layer protrudes completely beyond the surface.

Abstract: A welding method in which the power is controlled in accordance with the temperature of the welding point is provided. The temperature of the welding point is lowered in a controlled manner at the end of the method and the temperature of this welding point is measured by a temperature measuring appliance.