Laminated iron core and manufacturing device and manufacturing method therefor

Abstract

A manufacturing method for a laminated iron core for joining multiple iron core laminae by successively forming multiple spot-shaped welded parts on the multiple iron core laminae that are stacked includes: a first welding step of forming first welded parts, which constitute multiple welded parts, at a first pitch in a stacking direction on a first iron core lamina group composed of a part of the multiple iron core laminae; and a second welding step of forming, after the first welding step, second welded parts, which constitute the multiple welded parts, at a second pitch in the stacking direction on a second iron core lamina group composed of a part of the multiple iron core laminae adjoining the first iron core lamina group, wherein the second pitch is greater than the first pitch.