Layer building process and layer building apparatus for the additive manufacture of at least one wall of a component, as well as computer program product and storage medium

A layer building process for the additive manufacture of at least one wall of an abradable seal of a turbomachine, comprising at least the following steps:

• forming an abradable seal, having a plurality of upstanding walls in the form of a honeycomb structure, of a turbomachine using the following layer building process steps:
• a) applying at least one powder layer of a material to at least one building-up and joining zone of at least one movable building platform;
• b) carrying out a first solidifying step, in which the material is irradiated selectively with at least one energy beam, wherein irradiation parameters of the at least one energy beam are set so that a molten bath with a molten bath diameter that is at least 25% of a wall thickness that is to be manufactured is produced, and a defect-affected wall region of the wall is produced;
• c) without applying a further powder layer, carrying out a second solidifying step, in which the defect-affected wall region produced in the first solidifying step is irradiated selectively with the at least one energy beam, wherein the irradiation parameters of the at least one energy beam are set in such a way that the defect-affected wall region is remelted to form a wall region of the wall with a smaller density of defects;
• d) lowering the building platform layer by layer by a predefined layer thickness;
• e) repeating the steps a) to d) one or more times;
• wherein the upstanding walls provide run-in sealing for a running-in counterpart turbomachine component in communication therewith.