Additive manufacturing apparatus and additive manufacturing method

An additive manufacturing apparatus for building a deposit on a substrate, the apparatus comprising:

• a feeder to feed a build material to a feeding position;
• an emitter to irradiate the feeding position with a laser beam that melts the build material;
• control circuitry to perform control for building the deposit by stacking beads formed by movement of the feeding position with respect to the substrate and melting of the build material;
• and
• arithmetic circuitry to execute an arithmetic process of computing parameters for the control circuitry to perform the control, wherein
• the beads include two beads stacked on each other, the two beads are a first bead and a second bead stacked on the first bead, the first bead being formed earlier than the second bead, the feeding position being a first position in formation of the first bead, the feeding positon being a second position in formation of the second bead,
• the arithmetic circuitry calculates an interval between the first position and the second position in a set direction on a basis of a width of the first bead and a diameter of the laser beam, the set direction being a direction of the width of the first bead, and
• the control circuitry performs control for setting the second position to a position shifted from the first position in the set direction by the interval, so as to allow a part of the second bead to protrude from the first bead in the set direction.