Method for manufacturing laminated molding, and laminated molding

A method for manufacturing an additively-manufactured object, comprising:

• an additively-manufacturing step of building a layered body by depositing a plurality of weld beads obtained by melting and solidifying a filler metal, the layered body having an opening along a forming direction of a first weld bead of the plurality of weld beads and an internal space surrounded by the plurality of weld beads;
• and
• a closing step of forming a closing wall portion connecting an edge portion of the opening with a second weld bead of the plurality of weld beads for closing,
• wherein
• in the additively-manufacturing step, at least a third weld bead of the plurality of weld beads is deposited on a base to build side wall portions facing each other, multiple weld beads of the plurality of weld beads having different width dimensions are deposited laterally from an upper end of a side portion of the side wall portions to build a connecting wall portion having the opening, the edge portion of the opening on the connecting wall portion is built by depositing a narrow weld bead of the plurality of weld beads having a bead width smaller than a bead width of another weld bead of the plurality of weld beads that builds another portion, and the opening is formed with a width dimension larger than a bead width of the second weld bead, and
• in the closing step, and the closing wall portion having a width dimension larger than the bead width of the second weld bead is formed by the second weld bead to close the opening.