Joining method and structure for laminate shaping component, and laminate shaping component

A method for joining an additively-manufactured component, comprising welding a plurality of additively-manufactured components via a weld joint to fabricate an integral structure, wherein:

• the additively-manufactured components are built by repeatedly depositing a weld bead layer of a next layer on a previous weld bead layer formed of a weld bead obtained by melting and solidifying a filler metal by use of an arc, the weld bead layer being formed of a plurality of rows of annular weld beads;
• the weld joint is built along with the deposition;
• and
• the method further comprises depositing the weld bead layer of the next layer with a shift in at least one of an annular inner circumferential side or an annular outer circumferential side within a layer plane from a layer end edge of the bead layer of the previous layer and forming the weld joint to have a single bevel groove, a single V groove, a double V groove, a single J groove, a double J groove, a single U groove, or a double U groove, and welding two of the plurality of additively-manufactured components together by a welded portion added to the groove.