Method for managing quality of additively manufactured object, apparatus for managing quality of additively manufactured object, program, welding control apparatus, and welding apparatus

A quality control device for an additively manufactured object obtained by repeatedly depositing beads formed by melting and solidifying a filler metal in a layered manner based on a predetermined building plan, the quality control device comprising:

• a limit value acquisition unit configured to acquire a limit value of a stress intensity factor of the additively manufactured object;
• an allowable defect dimension setting unit configured to obtain an allowable defect dimension of a defect present in the additively manufactured object by using a variation range of a load stress assumed in design of the additively manufactured object and a condition value including the limit value;
• a defect dimension setting unit configured to set, as a defect dimension, any one of a predicted value of a defect dimension of a defect that is capable of being generated in the additively manufactured object when the additively manufactured object is manufactured based on the building plan and a measured value of a defect dimension of a defect generated in a test specimen manufactured based on the building plan;
• and
• a determination unit configured to compare the defect dimension with the allowable defect dimension to determine quality of the beads or the additively manufactured object.