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casting defect
A casting defect is an irregularity in the metal casting process that is very undesired. Some defects can be tolerated while others can be repaired, otherwise they must be eliminated. They are broken down into five main categories: ''gas porosity'', ''shrinkage defects'', ''mold material defects'', ''pouring metal defects'', and ''metallurgical defects''.
==Terminology==
The terms "defect" and "" refer to two specific and separate things in castings. Defects are defined as conditions in a casting that must be corrected or removed, or the casting must be rejected. Discontinuities, also known as "imperfections", are defined as "interruptions in the physical continuity of the casting". Therefore, if the casting is less than perfect, but still useful and in tolerance, the imperfections should be deemed "discontinuities".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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