Method for joining a first component to a second component with the aid of laser welding

A method for welding a first component having a channel to a second component, comprising:

• placing a lower surface of the first component onto an upper surface of the second component;
• and
• transmitting a laser beam through the first component and onto the upper surface of the second component, the laser beam furthermore being guided along a trajectory across the upper surface;
• wherein the second component absorbs the laser beam along the irradiated trajectory, so that the irradiated trajectory of the second component is welded to the lower surface of the component in the form of a welding path, and wherein the channel has a rounded surface in a plane in which the laser beam is guided, and the rounded surface is configured in such a way that a predefined power density of the laser beam is present on the upper surface so that a continuous welding path is provided between the first component and the second component along the irradiated trajectory.